Experimental Standards and Methods for Testing Color Fastness to Perspiration of Textiles

The color fastness of textiles varies with different external conditions. A certain part of the properties of a class of textiles can only be defined after many tests and experiments. Here engineers from Standard Group (Hong Kong) Co., Ltd. introduces you to the experimental standards and methods for testing the color fastness to perspiration of textiles.

1. Purpose and principle of the test
1. Purpose:

Test the perspiration resistance of dyes or prints on colored textiles

2. Principle:

Soak the sample in artificial sweat with a standard multi-fiber cloth and then press it into the perspiration color fastness tester under the specified pressure and temperature conditions. After a certain time, the sample and the multi-fiber cloth are separated and dried, and then the color change of the sample and the coloring of the multi-fiber cloth are judged by a standard gray scale.

Second, reference test method
ISO 105 E04: 1994 / BS EN ISO 105 E04: 1996

3. Equipment and materials
1. AATCC Color Fastness Tester to Perspiration
2. 21 plastic plates with a size of 60mmx115mmx1.5mm
3. Oven (37 +2°C)
4. SDC or No. 1 Standard Multi-Fibre Cloth
5. Distilled water or deionized water
6. ISO/BS standard faded grays and stained grays One each.
7. Standard light source
8. Sodium Chloride (NaCl)
9. Monohydrochloride histidine (CH9O2N3HCl.H2O)
10. Disodium hydrogen phosphate: 2 crystals Water (Na2HPO4.2H2O )
11. Sodium dihydrogen phosphate: 2 water of crystallization (NaH2PO4.2H2O)
12. Sodium hydroxide (NaOH)
13. Volumetric flask 500ml, 100ml
14. Drip bottle 50 ml
15. Brown bottle with fine opening 1000 ml
16. Electronic scale

Fourth, sample preparation.
Cut the sample and multi-fiber cloth witht a size of 40 mm100 mm, and sew the sample and the multi-fiber cloth opposite each other along one short side of the sample and the multi-fiber cloth.

5. Preparation of Reagents.
1. Preparation of 0.1 N sodium hydroxide solution
Dissolve 2 g of sodium hydroxide in 500 ml of distilled water or deionized water to prepare a 0.1 N sodium hydroxide solution
2. Alkaline sweat Dissolve 0.5 g histidine monohydrochloride (1 crystal water), 5 g sodium chloride, 2.5 g disodium hydrogen phosphate (2 crystal water) in 1 liter of distilled water or in deionized water, and then use 0.1 N sodium hydroxide solution to adjust to pH 8.0
3. Acid sweat
With 0.5g monohydrochloride histidine (1 crystal water), 5g sodium chloride, dissolve 2.2g sodium dihydrogen phosphate (2 crystal water) in 1L distilled water or deionized water, then adjust to pH 5.5 with 0.1N sodium hydroxide solution

6. Test procedure.
1. Soak the two samples and multifiber cloth in alkaline sweat and acid sweat at room temperature for about 30 minutes, turning them occasionally to wet them completely. Then the sample was taken out, sandwiched between two glass rods and the excess solution was removed.
2. Spread the sample and multifiber cloth flat, place between the plastic plates of the tester, place a weight of approximately 3.6 kg (8.0 lb) and pin the pressure plate securely. The pressure on the sample is about 4.5 kg (10.0 lb) and the pressure on it is about 12.5 kPa.
3. Place the tester with the sample vertically in an oven at 37+2°C for 4 hours. 4. Remove the sample and air-dry naturally at a temperature not exceeding 60°C when the sample is separated from the multi-fibre cloth.
5. Under the standard light source, use a standard gray scale to measure the color change of the sample and the coloration of the mmultifiber cloth.

7. Report
1. Test method
2. Color change level of the sample. 3. Degree of coloring of different fiber strips on multi-fibre cloth.

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