What is perspiration colorfastness and how to test

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 textile color to various processes during its production and usage. 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 represents the textile’s ability to retain its color against external forces, making it a crucial textile quality indicator. They are commonly used to test the fastness of dyeing, including fabric washing color fastness, rubbing color fastness, perspiration fastness (Fabric Perspiration Fastness Assessment), sun fastness, pressing fastness, and so on.

Colorfastness

This blog will discuss perspiration fastness and fabric colorfastness perspiration test method.

What is perspiration fastness

Perspiration colorfastness refers to the ability of a fabric to retain its color when exposed to perspiration. During use, textiles, especially clothing, can come into contact with sweat, affecting the fabric’s color. This is particularly important for garments like sportswear, which will likely come into contact with sweat regularly.

perspiration colorfastness loss

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 like 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.

sweat cause perspriation color loss

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 by the body through the skin, posing potential health risks. Therefore, ensuring the perspiration colorfastness of clothing is crucial for maintaining the garment’s appearance and consumer health and safety.

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 perspiration colorfastness can lead to discoloration or staining, impacting the product’s appearance and longevity.

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, set aside for preparation.

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 weight

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.

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.

Click to check fabric colorfastness perspiration test equipment from DaRong

perspiration colorfastness tester
oven for perspiration test
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