ISO 105-E01 Textile Color Fastness to Water Testing

Introduction 

Color fastness to water is one of the most important quality evaluations in the textile industry. Textile products are frequently exposed to water during washing, storage, transportation, and daily use. Poor water fastness can lead to color bleeding, staining, fading, and customer complaints. 

International Organization for Standardization ISO 105-E01 is the internationally recognized test method used to evaluate the resistance of textile colors to water exposure under controlled laboratory conditions. 

Professional textile laboratories such as METS Laboratories perform ISO 105-E01 testing to help manufacturers ensure product quality, international compliance, and buyer approval. 

 

What is ISO 105-E01? 

Textiles — Tests for colour fastness — Part E01: Colour fastness to water 

The method specifies a procedure for determining the resistance of textile colors when fabrics are immersed in water under controlled conditions. 

The test evaluates: 

• Color change of the specimen 
• Staining on adjacent fabrics 
• Dye migration during water exposure 

This testing is widely used for: 

• Apparel textiles 
• Sportswear 
• Home textiles 
• Children’s garments 
• Upholstery fabrics 
• Technical textiles 

Importance of Color Fastness to Water Testing 

ISO 105-E01 testing helps manufacturers: 

• Ensure product durability 
• Prevent color bleeding 
• Improve customer satisfaction 
• Meet retailer quality requirements 
• Support export compliance 
• Maintain brand reputation 

Many international buyers require water fastness testing before product approval. 
 

Drying and Evaluation 

After drying, laboratory experts assess: 

• Color change of the original specimen 
• Staining on adjacent fabrics 

Evaluation methods include: 

• Grey scale comparison 
• Instrumental color measurement 
• Visual assessment under controlled lighting 

Grey Scale Ratings in ISO 105-E01 

The results are commonly rated using a grey scale from: 

Rating       Performance

1                   Poor fastness 

5                   Excellent fastness 

Higher ratings indicate better resistance to water exposure. 

Common Causes of Poor Water Fastness 

Several factors may reduce water fastness performance: 

• Poor dye fixation 
• Excess unfixed dyes 
• Incompatible dye-fiber combinations 
• Improper washing after dyeing 
• Low-quality dye chemicals 

Proper dyeing and finishing processes improve fastness results. 

Conclusion 

ISO 105-E01 is an essential textile testing standard for evaluating color fastness to water exposure. Reliable testing helps manufacturers maintain product quality, prevent customer complaints, and comply with international buyer requirements. 

Professional laboratories such as METS Laboratories use standardized methods and advanced testing equipment to provide accurate and dependable textile testing services. 

As global quality expectations continue to increase, water fastness testing remains a critical component of textile quality assurance and compliance programs.