Chemical Exposure from New Clothing: A Comparative Case-Cum-Research Study of Nylon, Polyester, Cotton, Linen and Saree Fabrics Across India and Selected Countries

 

Chemical Exposure from New Clothing: A Comparative Case-Cum-Research Study of Nylon, Polyester, Cotton, Linen and Saree Fabrics Across India and Selected Countries

Abstract

Clothing is generally considered a protective barrier between the human body and the external environment. However, textile manufacturing involves dyeing, bleaching, printing, finishing, softening, wrinkle resistance, shrink resistance, water repellence and other chemical treatments. Consequently, the biological safety of clothing cannot be determined solely from whether a fibre is natural or synthetic.

This case-cum-research study examines potential human exposure to textile chemicals in nylon, polyester, cotton, linen and saree fabrics, with particular attention to azo dyes, formaldehyde-releasing finishing agents and other textile auxiliaries. The study compares the regulatory approaches of India, the European Union, the United States, Switzerland and Japan. The European Union has particularly developed restrictions on hazardous substances in clothing and skin-contact textiles under REACH, while voluntary systems such as OEKO-TEX STANDARD 100 test finished textiles for a large range of harmful substances.

The study develops a comparative analytical framework covering chemical exposure, skin-contact potential, moisture/heat retention, consumer awareness, washing behaviour and perceived adverse effects. Chi-square, independent-samples t-test, one-way ANOVA and correlation analysis are proposed for empirical testing. The results demonstrate why the statement "synthetic clothes are harmful" is too broad. The scientifically stronger conclusion is that chemical treatment and residual substances, rather than fibre origin alone, are important determinants of textile-related health risk.

Keywords: textile chemicals, nylon, polyester, cotton, linen, formaldehyde, azo dyes, textile dermatitis, REACH, OEKO-TEX, consumer health, clothing safety

 

1. Introduction

Clothing comes into prolonged and repeated contact with the human body. Under normal conditions, a garment may remain in contact with the skin for several hours every day. The situation becomes particularly relevant in underwear, shirts, trousers, sarees, sportswear, children's clothing and bedding.

The textile industry uses numerous chemical substances during fibre production, bleaching, dyeing, printing and finishing. These chemicals can improve colour, softness, wrinkle resistance, durability, shrink resistance, water repellency and appearance.

Dermatological evidence indicates that textile contact dermatitis is more frequently associated with chemicals used in textile processing than with the textile fibre itself. Formaldehyde finishing resins, textile dyes and other chemical additives are recognised causes of textile-related allergic or irritant reactions.

This creates an important research question:

Does the health risk of new clothing arise primarily from the fibre itself, or from the chemicals used to manufacture, dye and finish the garment?

The distinction is particularly important when comparing polyester and nylon with cotton, linen and traditional Indian sarees.

 

2. Background of the Case

A consumer purchasing a new garment normally observes:

colour;

softness;

shine;

texture;

price;

brand;

design;

comfort; and

durability.

The consumer normally cannot observe:

residual formaldehyde;

restricted azo-dye cleavage products;

finishing chemicals;

dye carriers;

softeners;

resin residues;

heavy-metal impurities;

other restricted substances.

Consequently, a garment may appear attractive and comfortable while its chemical composition remains largely invisible to the consumer.

This is particularly important for inexpensive fast-fashion garments, heavily dyed clothing, wrinkle-resistant fabrics and garments marketed as "easy care", "permanent press", "non-iron" or "stain resistant".

 

3. Problem Statement

The central problem investigated in this study is the potential gap between:

consumer perception of textile safety

and

the actual chemical composition and regulatory compliance of finished clothing.

The study specifically examines whether:

synthetic fibres such as nylon and polyester should automatically be considered harmful;

natural fibres are necessarily safer;

formaldehyde-containing finishing treatments can affect consumers;

azo dyes can create exposure concerns;

sweating and friction increase skin exposure;

new garments should be washed before first use;

consumer awareness is adequate; and

regulatory controls differ substantially between countries.

 

4. Research Objectives

Objective 1

To examine potential chemical exposure associated with new nylon, polyester, cotton, linen and saree fabrics.

Objective 2

To investigate the role of formaldehyde-containing finishing treatments in cotton, linen and other fabrics.

Objective 3

To examine the potential toxicological significance of azo dyes and aromatic amines.

Objective 4

To compare textile chemical regulations in India and selected countries.

Objective 5

To examine consumer awareness regarding textile chemical residues.

Objective 6

To analyse whether consumers report more skin discomfort after wearing new garments before washing.

Objective 7

To determine whether fibre type alone is a statistically significant predictor of reported skin discomfort.

Objective 8

To develop recommendations for consumers, manufacturers, regulators and exporters.

 

5. Research Questions

Are nylon and polyester intrinsically harmful to human health?

What chemicals are potentially present in new garments?

Can formaldehyde-based finishing agents remain in cotton and linen?

Can azo dyes generate potentially hazardous aromatic amines?

Does sweating increase the possibility of chemical release from textiles?

Are consumers sufficiently aware of textile chemical exposure?

Do countries differ in their regulatory treatment of textile chemicals?

Does washing new clothing reduce reported irritation?

Is skin discomfort related to chemical treatment rather than fibre type?

 

6. Research Hypotheses

H01

There is no significant association between fibre category and reported skin discomfort after wearing new clothing.

H02

There is no significant difference in reported skin discomfort between consumers who wash new garments before use and those who do not.

H03

There is no significant relationship between consumer awareness of textile chemicals and the practice of washing new garments before first use.

H04

There is no significant difference in perceived chemical exposure risk among nylon, polyester, cotton, linen and saree fabrics.

H05

There is no significant relationship between sweating/friction exposure and reported textile-related skin irritation.

 

7. Conceptual Framework

The study proposes the following model:

Fibre type

↓

Dyeing / bleaching / finishing / softening

↓

Chemical residues

↓

Sweat + heat + friction + prolonged skin contact

↓

Potential chemical migration/exposure

↓

Skin irritation / sensitisation / dermatitis in susceptible individuals

The second pathway is physiological:

Synthetic or tightly woven fabric

↓

Heat and moisture retention

↓

Sweating

↓

Friction and microbial growth

↓

Irritation/intertrigo in susceptible individuals

These two pathways should not be confused.

 

8. Mechanism of Harm

8.1 Pathway I — Chemical Exposure

The chemical pathway includes:

Dye → residual chemical → sweat/moisture → skin contact → absorption or local irritation

The risk depends upon:

chemical identity;

concentration;

residual amount;

duration of contact;

temperature;

sweating;

skin condition;

friction;

frequency of use; and

individual sensitivity.

Therefore, simply identifying a polyester or nylon fibre does not establish toxicity.

 

9. Azo Dyes

Azo dyes are an important class of textile colourants.

Research has demonstrated that some azo dyes can be metabolised by skin microorganisms to aromatic amines. Certain aromatic amines possess mutagenic or carcinogenic properties.

A Swiss study examining 153 clothing textiles found potentially concerning non-regulated aromatic amines in 17% of samples, with some samples exceeding 30 mg/kg and a maximum reported concentration of 622 mg/kg. The study illustrates the importance of chemical testing but does not mean that 17% of all clothing globally is unsafe.

The European Union has consequently restricted clothing textiles containing specified carcinogenic, mutagenic or reprotoxic substances under REACH.

 

10. Formaldehyde in Cotton and Linen

Cotton and linen are natural fibres, but natural fibre does not mean chemically untreated.

During textile processing, formaldehyde-containing resins may be used for:

wrinkle resistance;

crease resistance;

shrink resistance;

easy-care finishes;

durability;

antimicrobial applications in certain textile products.

Dermatological literature identifies formaldehyde resins used in textiles as a potential cause of allergic contact dermatitis. Sweat and sebum may facilitate release of free formaldehyde from some formaldehyde-containing resins.

Thus:

Cotton ≠ automatically chemical-free

and

linen ≠ automatically chemical-free.

At the same time, this does not mean that every cotton or linen garment contains hazardous formaldehyde concentrations.

 

11. Sarees as a Special Indian Case

Sarees may contain:

cotton;

silk;

polyester;

rayon;

viscose;

nylon blends;

metallic threads;

dyes;

printing chemicals;

stiffening agents;

finishing agents;

softeners;

starches;

resins.

The traditional or cultural character of a saree does not determine its chemical safety.

A handwoven natural-fibre saree and an industrially finished synthetic saree may therefore have very different chemical profiles.

 

12. Nylon and Polyester: Scientific Interpretation

The study deliberately rejects the simplistic statement:

"All nylon and polyester clothing is harmful."

Instead, the research proposition is:

Nylon and polyester may present exposure concerns when particular dyes, finishing chemicals, additives or contaminants remain in finished garments, while the physical properties of some synthetic fabrics may also influence heat, sweat and friction.

DermNet notes that natural and synthetic fibres can all be associated with textile dermatitis, while chemical additives are often the more important cause of allergic reactions.

Therefore, the correct comparison is:

Factor	Nylon	Polyester	Cotton	Linen	Saree
Fibre origin	Synthetic	Synthetic	Natural	Natural	Depends on fibre
Dye requirement	Often	Often	Often	Often	Often
Finishing possible	Yes	Yes	Yes	Yes	Yes
Formaldehyde-resin treatment possible	Yes	Yes	Yes	Yes	Yes
Azo dye exposure possible	Yes	Yes	Yes	Yes	Yes
Heat/moisture effect	Product-dependent	Product-dependent	Generally breathable	Generally breathable	Highly variable
Chemical-free automatically?	No	No	No	No	No
Health risk determined by fibre alone?	No	No	No	No	No

 

13. Comparative International Regulatory Framework

13.1 India

India has a large textile manufacturing and export sector and operates a system of BIS standards, textile regulations and export-related requirements.

BIS maintains standards covering numerous textile products and testing methods. For example, BIS lists standards for polyester-blended woven shirting and suiting among its textile standards.

However, a major research issue is that consumers generally do not receive a complete chemical inventory of every garment.

 

13.2 European Union

The EU provides a particularly important benchmark because REACH restricts specified hazardous substances in clothing, related accessories, skin-contact textiles and footwear.

The EU's REACH framework restricts 33 CMR substances in clothing, textiles and footwear under Entry 72, applicable from November 2020. The restrictions recognise possible consumer exposure through skin contact, inhalation and accidental ingestion of textile dust.

The EU also introduced restrictions on formaldehyde emissions from consumer articles, with textile articles included within the relevant framework.

 

13.3 Switzerland

Switzerland provides an important research example because published analytical research on clothing textiles has detected potentially concerning aromatic amines in retail samples.

 

13.4 United States

The United States uses a combination of federal chemical legislation, consumer-product regulation, state-level chemical restrictions and voluntary textile certification systems.

The regulatory philosophy differs from the EU's highly integrated REACH model, making the US useful for comparative research.

 

13.5 Japan

Japan has developed chemical-management and product-safety systems covering hazardous substances and consumer products, while Japanese textile manufacturers and exporters may additionally comply with international buyer standards.

 

14. OEKO-TEX as an International Benchmark

OEKO-TEX STANDARD 100 is particularly relevant because it tests finished textile products for harmful substances.

The system considers the intended use of the product, with stricter requirements for products involving greater skin contact. Product Class 1 applies to babies and young children, while Product Class 2 covers products with direct skin contact.

OEKO-TEX reported that in its 2025 ECO PASSPORT testing data, 2.7% of 2,174 formaldehyde-related tests exceeded the applicable threshold. This is not a prevalence estimate for all clothing, because the tests concerned specific ECO PASSPORT submissions and parameters.

This distinction is essential in academic writing.

 

15. Comparative Regulatory Table

Dimension	India	EU	USA	Switzerland	Japan
Textile chemical regulation	Yes	Extensive	Extensive but distributed	Strong	Strong
REACH system	No	Yes	No	Not EU REACH	No
Restricted hazardous substances	Yes, through applicable rules/standards	Extensive	Substance-specific	Strong	Substance-specific
Voluntary textile certification	Available	Widely used	Widely used	Widely used	Widely used
Consumer chemical transparency	Developing	Relatively stronger	Variable	Strong	Strong
Export compliance pressure	High	Very high	High	High	High
Research concern	Market compliance	Chemical restrictions	Fragmented regulation	Analytical monitoring	Chemical management

 

16. Proposed Research Methodology

Research design

A mixed-method case-cum-research design is recommended.

Primary research

Suggested sample:

300 consumers

India: 200

comparison-country respondents: 100

Sampling

Convenience sampling may be used for exploratory consumer research, followed by purposive sampling for textile retailers, manufacturers and dermatology/textile experts.

Secondary sources

scientific publications;

PubMed;

government regulations;

BIS;

EU REACH;

OECD;

WHO/IARC where relevant;

OEKO-TEX;

textile industry reports.

Variables

Independent variables

fibre type;

garment colour;

finishing;

newness;

washing before use;

sweating;

duration of wear.

Dependent variable

reported skin irritation/discomfort.

 

17. Illustrative Consumer Dataset

The following table is a model dataset for demonstrating statistical analysis. It must be replaced by actual field-survey observations before publication as empirical research.

Fibre/category	Sample	Reported irritation	No irritation
Nylon	50	15	35
Polyester	50	14	36
Cotton	50	9	41
Linen	50	7	43
Saree fabrics	50	10	40
Other/mixed	50	11	39
Total	300	66	234

Overall reported irritation:

66 / 300 = 22.0%

This is an illustrative statistical demonstration and not a claim that 22% of consumers nationally experience textile irritation.

 

18. Chi-Square Test

H0

There is no significant association between fibre category and reported irritation.

H1

There is a significant association between fibre category and reported irritation.

Using the illustrative table:

χ² ≈ 4.40

df = 5

p ≈ 0.49

Interpretation

At the 5% significance level:

p > 0.05

Therefore, the illustrative dataset does not provide evidence that fibre category alone is significantly associated with reported irritation.

This result is scientifically valuable because it contradicts the simplistic assumption that "synthetic = harmful."

The important implication is that chemical treatment, individual sensitivity, garment construction, sweat, friction and exposure duration should also be investigated.

 

19. Washing Before First Use

Illustrative data:

Consumer practice	Irritation	No irritation	Total
Washed before first use	21	129	150
Not washed	45	105	150
Total	66	234	300

Illustrative chi-square result:

χ² ≈ 9.06

df = 1

p < 0.01

Interpretation

The illustrative model indicates a statistically significant association between washing practice and reported irritation.

However, this does not prove that washing removes all harmful chemicals or that washing caused the reduction. Actual research would need controlled testing of garments before and after washing.

 

20. Consumer Awareness Analysis

Illustrative 5-point awareness scale:

Group	Mean awareness score	SD
Consumers washing new clothes	3.72	0.81
Consumers not washing new clothes	2.84	0.92

Illustrative independent-samples t-test:

t ≈ 8.72

p < 0.001

Interpretation

The illustrative result indicates a significant difference in awareness between the two groups.

Again, the values are demonstration data rather than observed population statistics.

 

21. ANOVA: Perceived Chemical Risk

Illustrative mean risk scores:

Fabric	Mean risk score
Nylon	3.71
Polyester	3.64
Cotton	2.91
Linen	2.65
Saree	2.88

Illustrative one-way ANOVA:

F(4,295) ≈ 8.31

p < 0.001

Interpretation

The illustrative ANOVA indicates statistically significant differences in perceived risk among fabric categories.

A post-hoc test such as Tukey HSD would then identify which groups differ.

Importantly, perceived risk is not equivalent to measured toxicological risk.

 

22. Correlation Analysis

Illustrative variables:

hours of daily clothing contact;

sweating frequency;

frequency of wearing unwashed new clothes;

skin discomfort score.

Illustrative Pearson correlation:

Variables	r	Interpretation
Sweat × irritation	+0.42	Moderate positive
Unwashed-new-clothes × irritation	+0.36	Moderate positive
Awareness × washing	+0.48	Moderate positive
Daily contact time × irritation	+0.29	Weak positive

All four illustrative relationships would require confirmation using real observations.

 

23. Comparative Risk Matrix

Exposure	Nylon	Polyester	Cotton	Linen	Saree
Dye-related exposure	Medium	Medium/High	Medium	Medium	Medium/High
Finishing chemicals	Medium	Medium/High	Medium/High	Medium	Medium
Formaldehyde-resin possibility	Possible	Possible	Possible	Possible	Possible
Sweat/friction concern	Medium/High	Medium/High	Medium	Low/Medium	Variable
Consumer awareness	Low/Medium	Low/Medium	Medium	Medium	Medium
Fibre alone establishes toxicity?	No	No	No	No	No

The table represents a research framework, not laboratory measurements.

 

24. Body Parts Potentially Affected

Textile-related reactions may occur particularly where clothing is tight, rubbing or heavily exposed to sweat.

Common areas include:

neck;

armpits;

waist;

inner thighs;

groin;

behind knees;

elbows;

back;

chest;

areas beneath tight elastic;

areas beneath bra/underwear;

face and neck where scarves or collars contact skin.

DermNet specifically notes that textile dermatitis associated with formaldehyde-containing clothing may occur in areas of substantial friction, including the inner thighs, gluteal folds and backs of the knees.

 

25. New Clothing and the "Chemical Smell"

A noticeable odour from new clothing does not by itself prove that the garment contains a dangerous concentration of toxic chemicals.

Possible sources include:

finishing agents;

dyes;

packaging;

storage conditions;

volatile substances;

manufacturing residues.

Therefore:

smell ≠ proof of carcinogenicity

but

unusual chemical odour + prolonged skin contact + irritation warrants caution.

 

26. Is Formaldehyde a Carcinogen?

Formaldehyde is recognised as a carcinogenic substance, but the health risk depends heavily on route, concentration and duration of exposure.

The European Commission describes formaldehyde as having carcinogenic and mutagenic properties and notes that it can act as a toxicant and skin sensitiser.

However, the presence of a formaldehyde-based finishing technology does not automatically establish that a particular garment exposes its wearer to a carcinogenic dose.

This distinction is critical for responsible academic research.

 

27. Why Natural Fibre Is Not Automatically Safer

The study proposes the following principle:

Natural fibre describes the origin of the fibre; it does not describe the chemical history of the finished garment.

Cotton may undergo:

bleaching → dyeing → mercerisation → softening → wrinkle-resistant finishing → washing

Linen may undergo:

scouring → bleaching → dyeing → finishing → softening

Silk may undergo:

degumming → bleaching/dyeing → finishing → softening

Therefore, "natural" should not be interpreted as "chemical-free."

 

28. Why Synthetic Fibre Is Not Automatically Dangerous

Similarly:

Synthetic fibre describes the material from which the fibre is manufactured; it does not by itself establish the toxicity of the finished garment.

A polyester garment manufactured and tested under strict chemical controls may have a lower chemical exposure risk than a poorly processed cotton garment containing problematic finishing residues.

Consequently, the correct scientific question is:

What substances are present in the finished garment, at what concentration, and under what exposure conditions?

 

29. International Comparative Case Findings

India

Large textile production and domestic consumption create a need for stronger consumer awareness and consistent testing.

European Union

REACH provides a strong model for restricting hazardous substances in clothing and skin-contact textiles.

Switzerland

Analytical research has demonstrated the value of laboratory surveillance of clothing chemicals.

United States

The regulatory framework is more distributed across federal and state mechanisms.

Japan

Chemical-management controls and demanding consumer/export markets encourage high compliance among major manufacturers.

International voluntary benchmark

OEKO-TEX STANDARD 100 demonstrates how finished garments can be assessed according to intended skin contact and harmful-substance criteria.

 

30. Major Findings of the Case Study

Fibre type alone is insufficient to determine textile health risk.

Chemical processing is a major factor.

Azo dyes require particular attention because some can release hazardous aromatic amines.

Formaldehyde-containing textile finishes can cause allergic contact dermatitis in susceptible people.

Cotton and linen can also contain chemical finishing residues.

Polyester and nylon can also be chemically treated and dyed.

Sweat, heat and friction may increase the likelihood of local irritation.

New garments may benefit from washing before first use, especially for sensitive consumers.

International regulation is increasingly focused on chemical content rather than fibre origin alone.

Consumer awareness remains important.

Laboratory testing is necessary before making claims that a specific garment is dangerous.

"Synthetic = harmful" and "natural = safe" are both scientifically inadequate generalisations.

 

31. Managerial Implications

For textile manufacturers

Reduce hazardous chemicals.

Use safer dyes.

Minimise formaldehyde-releasing finishes.

Maintain batch-level chemical testing.

Improve chemical traceability.

Adopt internationally recognised certification.

For retailers

Provide chemical-safety information.

Encourage washing instructions.

Prefer certified suppliers.

Maintain supplier compliance documentation.

For consumers

Wash new garments before wearing when practical.

Pay particular attention to garments with strong chemical odours.

Avoid prolonged use if irritation develops.

Prefer certified textiles where available.

Choose breathable clothing for hot and humid environments.

Individuals with known textile allergies should seek professional medical advice.

 

32. Policy Recommendations for India

Recommendation 1

Introduce stronger consumer-facing chemical-safety information for garments.

Recommendation 2

Develop a standardised textile chemical disclosure framework.

Recommendation 3

Increase random market testing.

Recommendation 4

Give greater attention to formaldehyde, restricted azo dyes and aromatic amines.

Recommendation 5

Strengthen testing of children's and underwear products because of direct skin contact.

Recommendation 6

Encourage OEKO-TEX or equivalent certification for export-oriented and high-risk products.

Recommendation 7

Create a QR-based textile safety disclosure system.

 

33. Proposed Textile QR Code

A future garment label could provide:

QR CODE

→ Fibre composition
→ Country of manufacture
→ Dye category
→ Formaldehyde test result
→ Restricted azo-dye test result
→ Heavy-metal test
→ Certification
→ Batch number
→ Washing recommendation
→ Manufacturer

This would transform textile safety from an invisible characteristic into a measurable consumer attribute.

 

34. Export-Import Implications

Chemical compliance is increasingly important for Indian textile exporters.

A garment acceptable in one domestic market may require additional testing or certification before entering another market.

Therefore:

Textile quality = physical quality + chemical safety + regulatory compliance + traceability.

This is especially relevant for India's export competitiveness in the EU and other highly regulated markets.

 

35. Research Gap

Existing research frequently examines individual chemicals, individual textile products or dermatological outcomes.

A broader research gap exists in integrating:

fibre type + textile chemicals + consumer behaviour + washing practice + sweating + regulatory differences + export compliance

within one comparative framework.

This study attempts to bridge that gap.

 

36. Limitations

Textile chemical concentration cannot be established from consumer perception alone.

Skin irritation has many possible causes.

Fibre composition varies between garments.

Finishing chemicals differ among manufacturers.

Washing behaviour varies.

Laboratory analysis is required to establish actual chemical concentrations.

Cross-country comparisons are affected by differences in testing methodologies.

Illustrative statistical tables in this paper are not substitutes for laboratory or field data.

 

37. Conclusion

The case study does not support the blanket conclusion that nylon and polyester are inherently harmful to the human body.

Instead, the evidence supports a more precise conclusion:

The potential health risk associated with clothing is determined by the combination of fibre, chemical processing, residual substances, exposure conditions and individual susceptibility.

Nylon and polyester may involve dyes and finishing chemicals, while cotton, linen and sarees can also undergo substantial chemical processing. Formaldehyde-containing finishing resins are particularly relevant to textile contact dermatitis, while certain azo dyes can generate aromatic amines of toxicological concern.

The most important policy shift is therefore from:

"natural versus synthetic"

to:

"chemically tested versus chemically unverified."

For consumers, washing new garments before first use is a reasonable precaution, particularly for people who experience textile irritation. For manufacturers and regulators, however, the long-term solution is chemical testing, safer chemistry, traceability and transparent labelling, rather than simply replacing synthetic fibres with natural ones.

 

 

Selected References

Brüschweiler, B. J., & Merlot, C. (2017). Azo dyes in clothing textiles can be cleaved into a series of mutagenic aromatic amines which are not regulated yet. Regulatory Toxicology and Pharmacology, 88, 214–226.

Brüschweiler, B. J., et al. Research on non-regulated aromatic amines in clothing textiles. Regulatory Toxicology and Pharmacology. The Swiss retail-sample study analysed 153 textile samples.

DermNet. Textile Contact Dermatitis. Discussion of textile fibres, formaldehyde resins, dyes and other textile additives.

DermNet. Formaldehyde and Formalin Contact Allergy. Evidence concerning textile exposure, sweating, friction and allergic contact dermatitis.

European Commission. REACH Restrictions. Restrictions on CMR substances in clothing, textiles and footwear.

European Commission. (2023). Chemicals: The EU restricts exposure to carcinogenic substance formaldehyde in consumer products.

OEKO-TEX. STANDARD 100. International textile safety certification and harmful-substance testing framework.

OEKO-TEX. (2025). ECO PASSPORT Findings. Textile chemical testing findings concerning formaldehyde and other substances.

Bureau of Indian Standards. Textile Standards. Indian standards relating to textile products and testing.

APPENDICES

Appendix A — Chemicals Used in Textile Processing and Their Potential Effects

Chemical / chemical group	Where used	Main purpose	Potential human-health concern	Particularly relevant fabrics
Formaldehyde / formaldehyde-releasing resins	Finishing	Wrinkle/crease resistance, easy-care finish	Skin irritation and allergic contact dermatitis; formaldehyde is classified as carcinogenic by IARC	Cotton, linen, viscose, blends
Azo colourants	Dyeing/printing	Colouring	Some restricted azo dyes can release carcinogenic aromatic amines	Cotton, polyester, nylon, wool and blends
Disperse dyes	Dyeing synthetic fibres	Colouring polyester/nylon and other synthetics	Some disperse dyes are associated with allergic contact dermatitis	Polyester, nylon, acetate
Phthalates	Printing, coatings, plastics	Flexibility/softness	Some phthalates have endocrine/reproductive toxicity concerns	Printed textiles, coated fabrics
Bleaching agents	Pre-treatment	Whitening/cleaning	Irritation if residues remain; process chemicals require controlled handling	Cotton, linen
Sodium hydroxide (caustic soda)	Mercerisation/scouring	Cleaning and fibre modification	Strong irritant/corrosive in concentrated form; finished textile risk depends on adequate processing/washing	Cotton
Hydrogen peroxide	Bleaching	Whitening	Irritation at sufficiently high exposure; normally decomposes during controlled processing	Cotton, linen
Sodium hypochlorite/chlorine compounds	Bleaching	Whitening/disinfection	Irritation; undesirable by-products possible depending on process	Cotton and other washable textiles
Heavy metals such as lead/cadmium/chromium	Dyes, pigments, trims	Colour fixation/pigmentation or components	Certain metals can cause systemic toxicity, sensitisation or organ effects	Dyed/printed textiles and trims
Nickel	Buttons, zippers, metallic accessories	Hardware	Allergic contact dermatitis in sensitised persons	Clothing with metal components
Organotin compounds	Certain finishing/coating applications	Antimicrobial/industrial finishing	Toxicological concern; restricted in many applications	Coated/treated textiles
Perfluoroalkyl substances/PFAS-related chemistry	Water/oil/stain resistance	Repellency	Some PFAS are persistent and associated with significant environmental and health concerns	Outdoor/protective textiles
Phenolic/chlorophenolic compounds	Historical preservative/antimicrobial applications	Preservation	Toxicological and environmental concerns; restricted substances exist	Certain treated textiles
Softeners/fragrance chemicals	Finishing	Softness and consumer appeal	Can cause irritation or sensitisation in susceptible individuals	Cotton, linen, synthetic and blended fabrics

Interpretation: The table demonstrates why “natural” and “synthetic” are not sufficient classifications of textile safety. Chemical processing must also be considered. OEKO-TEX STANDARD 100 specifically tests finished textile products for a broad list of harmful substances and applies stricter requirements as skin contact becomes more intensive.

 

Appendix B — Chemical Exposure Mechanism

Stage	Textile process	Possible chemical source	Potential exposure route	Possible outcome
1	Fibre production	Fibre-processing chemicals	Residual contact	Irritation/sensitisation
2	Scouring	Alkalis/detergents	Residues	Skin irritation
3	Bleaching	Peroxide/chlorine chemistry	Residues/by-products	Irritation
4	Dyeing	Azo/disperse/reactive dyes	Direct skin contact	Sensitisation/dermatitis
5	Printing	Pigments, binders, plasticisers	Skin contact	Irritation/sensitisation
6	Finishing	Formaldehyde resins, softeners	Skin contact	Dermatitis
7	Packaging	Volatile substances/odours	Inhalation/contact	Discomfort/irritation
8	Wearing	Sweat + heat + friction	Skin exposure	Increased local irritation
9	Repeated wearing	Cumulative repeated contact	Prolonged exposure	Persistent dermatitis in susceptible people
10	Washing	Removal of some residues	Reduced exposure	Potential reduction in irritation

Research conclusion: The biological effect depends on the identity, concentration, persistence and migration of the chemical, not merely on the name of the fibre.

 

Appendix C — Nylon, Polyester, Cotton and Linen: Comparative Evidence

Characteristic	Nylon	Polyester	Cotton	Linen
Fibre origin	Synthetic	Synthetic	Natural	Natural
Requires dyeing for coloured garments	Usually	Usually	Usually	Usually
Can contain finishing chemicals	Yes	Yes	Yes	Yes
Can use formaldehyde-based finishes	Possible	Possible	Possible	Possible
Can contain restricted dye residues if poorly controlled	Possible	Possible	Possible	Possible
Heat/moisture behaviour	Product dependent	Product dependent	Generally breathable	Generally breathable
Main textile-health concern	Dyes/finishes + heat/friction	Dyes/finishes + heat/friction	Finishes/dyes	Finishes/dyes
Fibre itself proves toxicity?	No	No	No	No
Chemical testing required?	Yes	Yes	Yes	Yes

Key finding

The comparison does not justify the statement:

“Nylon and polyester are inherently poisonous.”

The scientifically defensible statement is:

Synthetic and natural textiles can both carry chemical residues; the health relevance depends on the chemicals present, their concentration, exposure conditions and individual susceptibility.

 

Appendix D — Formaldehyde: Fabric, Function and Effect

Item	Evidence-based interpretation
Chemical	Formaldehyde
Why used in textiles	Certain finishing/resin technologies provide wrinkle/crease resistance and easy-care properties
Fabrics potentially affected	Cotton, linen, rayon, blends and other treated textiles
Main route of concern	Skin contact and, depending on circumstances, inhalation
Main dermatological concern	Irritant or allergic contact dermatitis
Is every treated garment dangerous?	No
Does natural fibre eliminate the concern?	No
Does washing necessarily remove all formaldehyde?	Not necessarily; effectiveness depends on the chemical formulation and garment
How should exposure be established?	Laboratory testing
Regulatory importance	Formaldehyde is subject to restrictions/limits in several regulatory and certification systems

The European regulatory framework has specifically addressed formaldehyde exposure from consumer articles, while textile certification schemes also include formaldehyde testing.

 

Appendix E — Azo Dyes and Aromatic Amines

Parameter	Finding
Chemical group	Azo colourants
Main application	Textile dyeing
Main concern	Certain azo dyes can reductively cleave to aromatic amines
Important distinction	Not every azo dye is carcinogenic
Restricted substances	Specific carcinogenic aromatic amines are restricted
Exposure route	Primarily prolonged skin contact for relevant clothing
EU approach	Restricts specified azo dyes capable of releasing listed aromatic amines above the applicable threshold
Indian testing	BIS standards/testing systems include aromatic amines released from azo dyes
Recommended analytical method	Laboratory extraction and chromatographic analysis
Consumer conclusion	Colour alone cannot determine chemical safety

EU REACH restricts azo dyes that can release specified aromatic amines above 30 mg/kg in relevant textile and leather articles intended for direct and prolonged skin contact.

 

Appendix F — Indian BIS Chemical-Safety Testing Evidence

Recent BIS documentation demonstrates that textile/product standards and testing frameworks can include chemical parameters such as:

Chemical/parameter	BIS testing evidence
Formaldehyde	Included in applicable textile/product testing
Aromatic amines from azo dyes	Included
Allergenic/carcinogenic disperse dyes	Included in applicable requirements
Chromium VI	Included in applicable requirements
Dimethyl fumarate	Included in applicable requirements
Organotin compounds	Included in applicable requirements
Chlorophenols	Included in applicable requirements
pH	Included
Phthalates	Included
Nickel/skin-contact parameters	Included in applicable requirements

BIS laboratory records explicitly list testing for formaldehyde, azo-dye aromatic amines, allergenic/carcinogenic disperse dyes, chromium VI, phthalates, pH and other chemical parameters under applicable product standards.

 

Appendix G — Selected Regulatory Comparison

Parameter	India/BIS evidence	European Union	OEKO-TEX STANDARD 100
Formaldehyde	Tested under applicable standards	Restricted/controlled under applicable chemical framework	Tested
Azo-derived aromatic amines	Tested under applicable standards	Restricted under REACH	Tested
Disperse dyes	Tested under applicable product requirements	Restricted substances under applicable frameworks	Tested
Phthalates	Tested under applicable requirements	Restricted in relevant articles	Tested
Heavy metals	Tested where applicable	Restricted substances in relevant products	Tested
pH	Applicable textile requirements	Product/standard dependent	Tested where relevant
Skin-contact sensitivity	Product dependent	Important for restrictions	Requirements become stricter with greater skin contact

OEKO-TEX states that STANDARD 100 tests every certified component of a textile article against a list of more than 1,000 harmful substances, with requirements adjusted according to intended use and skin contact.

 

Appendix H — Actual Regulatory Limit Examples

Substance/parameter	Regulatory/example limit	Significance
Azo-derived aromatic amines under EU REACH	30 mg/kg for specified amines in relevant articles	Above the specified threshold, relevant azo dyes are prohibited
Formaldehyde in applicable EU consumer articles	0.080 mg/m³ released formaldehyde under the applicable restriction	Addresses consumer exposure from relevant articles
BIS example — formaldehyde	300 ppm maximum in the cited current BIS textile-product document	Product-specific; not a universal limit for every garment
BIS example — pH	5–9 in the cited product requirement	Product-specific
BIS example — total phthalates	0.1% maximum in the cited product requirement	Product-specific

Important: BIS limits are standard/product specific and should not be presented as one universal Indian limit applicable to every textile. The cited BIS document, for example, specifies 300 ppm formaldehyde and 0.1% total phthalates for the particular product requirement in that document.

 

Appendix I — Health Effects by Body System

Body part/system	Possible textile-related effect	Main potential cause
Skin	Redness	Dyes, finishing chemicals, friction
Skin	Itching	Sensitising dyes/finishes
Skin	Contact dermatitis	Formaldehyde resins, dyes and other allergens
Skin	Burning/irritation	Irritant residues
Neck	Rash	Collar/friction + chemical exposure
Underarms	Irritation	Sweat + friction + dyes/finishes
Waist	Dermatitis	Tight clothing + sweat + finishes
Inner thighs	Irritation	Friction + perspiration
Respiratory system	Irritation in susceptible situations	Volatile substances/dust
Eyes	Irritation	Dust/volatile substances
General comfort	Heat/discomfort	Fabric construction and moisture retention

Important: These are possible associations, not proof that a particular garment caused a disease.

 

Appendix J — Before-Washing and After-Washing Evidence Framework

Fabric	Before washing	After washing	Research interpretation
Nylon	Chemical residues may be present	Some removable residues may decline	Requires laboratory comparison
Polyester	Dye/finishing residues may be present	Some residues may decline	Requires laboratory comparison
Cotton	Finishing/dye residues may be present	Some residues may decline	Formaldehyde release should be measured
Linen	Finishing/dye residues may be present	Some residues may decline	Laboratory confirmation required
Saree	Highly variable according to fibre and processing	Variable	Fibre and finish must be identified

Research rule: Washing should be treated as a risk-reduction precaution, not as proof that all chemicals have been removed.

 

Appendix K — Laboratory Results That Should Be Reported

Test	Unit	Before washing	After washing	% reduction
Free/releasable formaldehyde	mg/kg	Laboratory result	Laboratory result	Calculated
Aromatic amines	mg/kg	Laboratory result	Laboratory result	Calculated
Phthalates	mg/kg	Laboratory result	Laboratory result	Calculated
Chromium VI	mg/kg	Laboratory result	Laboratory result	Calculated
Nickel release	µg/cm²/week	Laboratory result	Laboratory result	Calculated
pH	pH units	Laboratory result	Laboratory result	Difference
Disperse dyes	mg/kg	Laboratory result	Laboratory result	Calculated

Percentage reduction

[
\text{Reduction (%)} =
\frac{\text{Before washing}-\text{After washing}}
{\text{Before washing}}\times100
]

This table should contain actual laboratory observations, rather than invented numerical results.

 

Appendix L — Statistical Analysis of Actual Garment Testing

If 100 or more garments are laboratory tested, the following analysis can be reported:

Statistical test	Research question
Mean	Average chemical concentration
Median	Typical residue level
Standard deviation	Variation between garments
Paired t-test	Before vs. after washing
Wilcoxon signed-rank	Before vs. after washing when data are non-normal
ANOVA	Difference among fibre categories
Kruskal-Wallis	Non-parametric comparison among fabrics
Chi-square	Compliance/non-compliance association
Pearson correlation	Relationship between chemical concentration and irritation score
Spearman correlation	Rank relationship where assumptions for Pearson are not satisfied
Multiple regression	Predict irritation using chemical and physical exposure variables

 

Appendix M — Final Comparative Risk Table

Factor	Nylon	Polyester	Cotton	Linen	Saree
Chemical dye exposure	Possible	Possible	Possible	Possible	Possible
Formaldehyde-finishing exposure	Possible	Possible	Possible	Possible	Possible
Azo-dye concern	Possible	Possible	Possible	Possible	Possible
Disperse-dye concern	More relevant	More relevant	Less characteristic	Less characteristic	Depends on fibre
Sweat/friction	Product dependent	Product dependent	Product dependent	Product dependent	Product dependent
Natural/synthetic status	Synthetic	Synthetic	Natural	Natural	Variable
Automatically safe	No	No	No	No	No
Automatically dangerous	No	No	No	No	No
Laboratory testing needed	Yes	Yes	Yes	Yes	Yes

 

Appendix N — Evidence-Based Final Finding

The complete evidence supports the following conclusion:

FIBRE ≠ CHEMICAL SAFETY

A garment's potential health risk should be assessed through:

Fibre + dye + finishing + chemical concentration + migration + skin contact + duration + individual susceptibility.

Therefore, the appropriate scientific conclusion is not:

“Nylon and polyester are harmful to the body.”

The stronger conclusion is:

“Certain chemicals used in the manufacture, dyeing, printing and finishing of both synthetic and natural textiles may cause adverse health effects under relevant exposure conditions; therefore, textile safety should be assessed by chemical testing and regulatory compliance rather than by fibre origin alone.”

This conclusion is consistent with the existence of regulatory testing for formaldehyde, azo-derived aromatic amines, disperse dyes, phthalates and other substances in textile/product standards.