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What we need to know about color fastness

What we need to know about color fastness

2022-04-13

Textile fabric, such as bedsheets, clothes, etc., a lot of them will lose color after washing, some products fade seriously, even after washing many times, there will still be discolored. 


Test Preparation before Color Fastness to Washing

1 What test standards are there?

Color fastness to washing is one of the common test items for textile dyeing fastness, which is mainly used to test the fastness of fabric clothing and home textile products after one or more times to simulate the dyeing after household washing and commercial washing. There are three common standard: AATCC 61, ISO 105 C06, GB/T 3921. 


2 The principle of testing that you should know:

Stitch the sample with one or two pieces of specified multi-fiber adjacent fabric, which is placed in soap solution or other washing solution, mechanically stirred at the specified time and temperature, cleaned and dried. Taking the original sample as the reference sample, assess the discoloration of the sample by the left gray scale, and then assess the color stain of the adjacent fabric by the right gray scale.

Feature of Washing Fastness Tester

Washing Fastness Tester apply to test dyeing textile color fastness changing degree after washing, it means color fastness to perspiration, it not only do washing color fastness and also dry washing color fastness test.


Perspirometer Perspiration Tester design parameter conform to ISO, BS, AATCC, JIS & SDC those standards.Washing Color Fastness washing machine’s box and its test cup adopt stainless steel material, it have anti-high temperature, acid-base, corrosion functions.Equip with door safety switch, can protect from burning or injured.


Equip with procedure time counter, digital temperature controller, auto temperature & time control, it has alarm hint while experiment ending.Can customize cup compound mode according to customers requirements.


Testing Process of Colour fastness to Washing


1. Samples Preparation:  Place the samples and multi-fiber adjacent fabric under the constant temperature and humidity (temperature: 21±1℃, humidity: 65%±3%) for 4 hours. Cut 40mm*100mm specimen and multi-fiber adjacent fabric, and suture the specimen and multi-fiber adjacent fabric face to face along one short side.

 

2. Reagent Preparation:  Prepare corresponding reagents according to different test standards and keep them as standby. If sodium perborate is required in the test, the preheating temperature shall not exceed 60℃ when preparing the solution, and it shall be used within 30 minutes at most to prevent the loss of oxidant.

 

3. Solution Warm-up:  Put the specified volume of solution and a specified number of steel balls into the stainless steel cup, put the stainless steel cup into the launderometer for a few minutes, preheat to the specified temperature. Then put in the prepared sample for test.

 

4. Assessment Records:  At the end of all tests, flush the samples twice with distilled water at 40℃, and then dry the samples in air not exceeding 60℃. After drying, assess the change in color of the sample and the stain of multi-fiber adjacent fabric under the color light box, and record the data sheet according to the requirements.

Wash fastness is the most common test item for clothing textiles, which and crocking color fastness test are the two tests that are most prone to problems in textile materials. If you want to know more about the textile colour fastness test, please pay attention to Gester instruments.


GESTER INTERNATIONAL CO.,LIMITED is a national high-tech enterprise engaged in R&D and production of high precision physical properties testing equipment with 20+ years experience, expertly specialized  in providing integrated laboratory testing solutions for children's products, textile, footwear and furniture. It has passed ISO 9001 certificate,  “AAA Enterprise in Quality, Service and Credit” and was audited as SGS audited supplier.


GESTER instruments is a textile testing equipment manufacturers which integrates research & devolepment, prodution and sales in one. So far, GESTER owns two production factories and four sales teams for textile tester, footwear tester, Mask Tester and Protective Clothing Tester, Lab Incubator, Biological Safety Cabinet, Lab Oven etc. 


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