This article will guide you to explore the perspiration colorfastness of textiles and the methods to test perspiration colorfastness. Keep Colors Alive: The Ultimate Guide to Perspiration Colorfastness Testing.
What is Colorfastness to Perspiration
This is a very important textile quality parameter used to evaluate the resistance of dyed or printed fabrics to human sweat. Under wearing conditions, the garments are continuously exposed to factors such as sweat, body heat, salts, and acidic or alkaline perspiration, depending on the wearer’s body, which may cause shade alteration, staining, or dye migration onto adjacent materials. This test helps manufacturers assess the durability and performance of the fabric used in sportswear, casual wear, underwear, uniforms, and home textiles. Different international testing standards, such as ISO 105-E04, AATCC 15, and GB/T 3922, are widely used to determine colorfastness to perspiration under controlled laboratory conditions for reliable textile quality control.
Science Behind Colorfastness to Perspiration
Sweat affects textile coloration because it contains water, sodium chloride (NaCl), Amino Acids (H2N−CHR−COOH), lactic acid (CH3−CH(OH)−COOH), and other electrolytes that interact with dye molecules and textile fibers. When the textile material absorbs sweat, moisture penetrates the fiber structure and weakens the intermolecular attraction between the dye molecule and the fiber polymer. Under acidic or basic conditions, certain bonds between the dye and fiber become unstable, especially in the case of reactive dyed cotton, acid dyed nylon and some other direct dyed fabrics. High temperatures and pressures during wear also accelerate dye diffusion and hydrolysis, leading to color fading or staining on adjacent fabrics.
Hydrophilic fibers, such as cotton and wool, absorb perspiration quickly and increase the likelihood of dye bleeding, whereas hydrophobic fibers, such as polyester, usually have better perspiration and dye resistance due to their lower moisture absorption and stronger dye entrapment within the fiber matrix. Poor fixation, unfixed dyes on the surface, and improper after-treatment also contribute to perspiration-related changes in shade. That is why the color fastness of a fabric is important for evaluating the stability of the dye, the safety of the wearer, and the long-term performance of the garment in textile applications.
What is Colorfastness
Colorfastness significantly influences the daily washing of clothing textiles, dictating the extent of color loss experienced. The varying degrees of color loss during washing can be attributed to differences in colorfastness, which can also fluctuate across different temperatures and physical or chemical environments. Also referred to as dyeing fastness, colorfastness measures the resistance of a textile’s color to various processes during its production and use. It reflects how well-dyed fabrics can resist external factors (such as pressure, friction, washing, rain exposure, light, seawater immersion, saliva immersion, water stains, sweat stains, etc.) that may cause fading.
Essentially, colorfastness is the textile’s ability to retain its color under external forces, making it a crucial indicator of textile quality. They are commonly used to test dyeing fastness, including fabric-washing color fastness, rubbing color fastness, perspiration fastness (Fabric Perspiration Fastness Assessment), sun fastness, pressing fastness, and so on.
This test is not only a tool for measuring dye retention but also indicates the bond stability between the dyes and the fiber. Different fibers react differently with dyes and chemicals due to their molecular structure. When two different fibers are dyed similarly, but their performance under washing and perspiration exposure can differ significantly. This test simulates these conditions to predict the real-world performance.
This blog will discuss the perspiration fastness and fabric colorfastness perspiration test method.
What is perspiration fastness?
Perspiration colorfastness refers to a fabric’s ability to retain its color when exposed to perspiration. During use, textiles, especially clothing, can come into contact with sweat, which can affect the fabric’s color. This is particularly important for garments like sportswear, which will likely come into regular contact with sweat.
Factors affecting perspiration colorfastness
The presence of acids, salts, and metallic ions in perspiration can cause a color change through chemical reaction with dyes and auxiliaries. Some reactive dyes can hydrolyze under acidic conditions, while some disperse dyes can migrate under moist conditions. With the help of this test, textile chemist can choose dyes and auxiliaries to enhance perspiration fastness for different garments as per their end-use.
The human body has millions of sweat glands, with areas such as the forehead, armpits, back, and palms being the most prone to sweating. This is why sportswear and summer clothes, such as shirts and T-shirts, often experience significant fading in these areas. Human sweat is complex in composition, primarily consisting of salt, with acidity or alkalinity that varies from person to person. Prolonged contact between textiles and sweat can significantly affect certain dyes.
The pH of sweat ranges from 4.5 to 7.0 and can be slightly acidic. This acidic sweat can accelerate color fading in some cotton dyed with reactive dyes, while alkaline perspiration can affect acid or direct dyes on wool and silk. Manufacturers try their level best to control these issues with lab tests before consumer use.
Garments with subpar dye fastness may transfer dye from the fabric to the human skin through sweat. Such transfers could involve dye molecules and heavy metal ions, which can be absorbed through the skin, posing potential health risks. Therefore, ensuring the colorfastness of clothing is crucial for maintaining the garment’s appearance and consumer health and safety.
Setting health concerns aside, poor perspiration fastness often leads to visible staining and discoloration on clothing, which affects consumers’ perception of quality. After repeated wear or exposure to perspiration, garments tested by this test can retain their original hue and aesthetic appeal, reducing returns and complaints.
Fabric Perspiration colorfastness test
Testing for perspiration colorfastness typically involves subjecting the fabric to artificial perspiration under controlled conditions, then assessing any color change or transfer. It’s a critical test for ensuring the quality of clothing and other textiles, as poor colorfastness to perspiration can lead to discoloration or staining, affecting the product’s appearance and longevity.
In the testing laboratory, a chemist prepares artificial perspiration solutions with both acidic and alkaline pH values and performs tests to assess the fabric’s behavior under reproducible conditions, ensuring consistency in quality control.
Fabric Perspiration colorfastness standards
Currently, China uses the textile color fastness to perspiration standard GB/T3922-2013; this standard and the international standard IS0105-E04: 1994 equivalent. The color fastness to perspiration standards used in Britain, Germany, and France are BSEN ISO 105-E04:1996, DIN EN ISO 105-E04:1996, and NF EN ISO 105-E04:1996, which are equivalent to IS0105-E04:1994.
Fabric Perspiration colorfastness test Protocal
Period 1
Add a liter of third-grade water, alkaline test solution.
In the same way, takes 0.5g of amino acid hydrochloride sodium oxide, 5g
2.2 g of na dihydrogen phosphate dihydrate
Pour into the measuring cylinder, add a liter of third-grade water
Use 4g per liter of sodium hydroxide solution
Adjust the PH value of the acid-based test solution.
Start to test the PH value
Extract an appropriate amount of sodium hydroxide solution.
Drop into the acid test solution, and whisk together.
Measure the pH according to standard requirements, ensuring that the acidic liquid achieves a pH of 5.5. In case this requirement is not met, proceed with additional sodium hydroxide extraction.
Drop it into an acidic solution, stir well, and measure the PH again
Acid test solution to achieve the standard PH value.
Test the alkaline test solution in the same way until it reaches the standard PH of 8, and set it aside for preparation.
pH should be properly adjusted, similar to real-life sweat conditions. Deviation in the pH can lead to unrealistic test results, which will misrepresent the fabric’s performance.
Proper pH adjustment ensures that the artificial perspiration mimics real-life sweat conditions. Acidic or alkaline deviations can lead to unrealistic test results, potentially misrepresenting the fabric’s performance. This step is critical for reliable quality assessment.
Period 2
Take a sample, sample size 40 x 100 mm
Use the multi-fiber fabric of the same size, and Stitch together the short edges of the same-sized multi-fiber fabric.
Prepare and test two samples separately for acidity and alkalinity.
Mark it and weigh
Measure the acid test solution at a ratio of 50:1 and fully wet the specimen. Follow the same procedure for measuring the alkaline test solution.
Immerse the sample in an acid solution and an alkaline solution, respectively, and let them soak for 30 minutes.
Multi-fiber should include standard fibers such as acetate, cotton, nylon, polyester, acrylic, and wool, allowing simultaneous results for color transfer across different fibers in blended fabric.
Period 3:
Open YG(B)902 colorfastness tester oven
Set temperature, 37 degrees Celsius
Put perspiration color fastness tester in
Start pre-heat.
After 30 minutes, take out the pre-heated sample rack.
Take out 11 acrylic resin sheets and set them aside.
Squeeze excess liquid from a sample with a glass rod. Place between two resin plates, and put on the remaining resin sheet.
Mounted on the color fastness tester, install the hammer, apply 12.5 KPA, and screw tighten.
Install another combined sample similarly, and set the testing time to 4 hours. Put the installed sample into the preheated oven.Turn on the timer switch and start the experiment.
At the end of 4 hours, the instrument gives a warning sound, turns off the timer switch and power, and takes out the sample.
Unroll the sample and hang it in the air at a temperature of sixty degrees Celsius to dry.
Raing is performed under the standard lightbox.
To get the combined effect of sweat, friction, and body heat, controlled pressure and heat are applied in this testing. For uniform contact, acrylic sheets are used, and evaluation under standardized light sources provides an objective assessment of color change or staining.
Click to check fabric colorfastness perspiration test equipment from DaRong
Conclusion
Colorfastness to perspiration is an important quality parameter for textiles, especially for garments and other articles which exposed to sweat. With the help of this method, manufacturers can ensure that there made fabric is resistant to fading, has the required appeal, and minimizes potential health risks from dye transfer. Proper selection of textile dyes and auxiliaries based on these tests can contribute to a durable product. High-quality textile articles suitable for everyday wear and specialized applications such as sportswear.
FAQs
Why is colorfastness to perspiration important?
This test prevents shade fading and dye transfer from garments to skin, ensuring longevity, safety and the satisfaction of the customer.
Which fabrics are most affected by perspiration?
Natural fibers such as cotton and wool usually show higher receptiveness to color change, while synthetic fibers resist. Fabrics made from blends require highly careful testing.
What are the key standards for testing perspiration colorfastness?
GB/T3922-2013, ISO 105-E04:1994, BSEN ISO 105-E04:1996, DIN EN ISO 105-E04:1996, and NF EN ISO 105-E04:1996 are the key standards.
Can perspiration fastness be improved?
Yes, by choosing appropriate dyes and auxiliaries, manufacturers can enhance resistance to sweat and can maintain color integrity over time.
What is colorfastness to perspiration in textiles?
Colorfastness to perspiration refers to a fabric’s ability to retain its original color when exposed to human sweat, and, using this test, lab personnel measure both shade change and staining on adjacent fabrics under controlled acidic and basic conditions.
Why is perspiration fastness important for sportswear?
Both sportswear and activewear remain in direct contact with sweat for a long time, and poor sweat resistance may cause dye bleeding, discoloration of the garment, skin staining, and reduced garment appearance, making perspiration testing important for performance textiles.
Which textile fibers are more sensitive to perspiration?
Natural fibers such as cotton, wool, and viscose are hydrophilic and absorb more moisture, which may lead to greater dye migration, while synthetic fibers such as polyester are hydrophobic and provide better perspiration fastness due to their lower moisture absorbency.
Which international standards are used for perspiration testing?
The most commonly used testing standards are ISO 105-E04, GB/T 3922, BS EN ISO 105-E04 and DIN EN ISO 105-E04. These standards completely define the testing procedure, evaluation methods for results, and lab conditions.
What is causing staining during perspiration testing?
Staining occurs when unfixed or weakly bonded dye molecules remain on the surface of the testing materials and migrate from the testing specimen onto the adjacent multifiber fabric during exposure to moisture, heat, and pressure.
How can perspiration fastness be improved?
Textile manufacturers can improve perspiration fastness by selecting high-wet-fastness dyes, optimizing fixation parameters, performing effective soaping, controlling dyeing pH, and using appropriate after-treatment chemicals.
How are perspiration test results evaluated?
After completion of the testing process, the specimen is assessed using grayscale for color changes and staining under standard lighting conditions. The rating ranges from Grade 1 (poor) to Grade 5 (excellent).
Related Resources
Insights to Textile Colorfastness Standards from A Front-Line Technician
AATCC 117/AATCC 133 Color Fastness to Scorch and Sublimation
Mastering Color Fastness: Test Methods and Techniques for Exceptional Results
A Guide to ColorFastness in Textile Dyeing: What You Need to Know for Long-Lasting Vibrance