Color fastness is also called color fastness and dyeing fastness. It refers to the resistance of the color of textiles to various effects during processing and use. The fastness grade is evaluated according to the discoloration of the sample and the staining of the undyed lining fabric. Textile color fastness test is a routine test item in the internal quality test of textiles.

During its use, textiles will be exposed to various external effects such as light, washing, ironing, perspiration, friction and chemical agents. Some printed and dyed textiles are also subjected to special finishing processes, such as resin finishing, flame retardant finishing, sand washing, and grinding. This requires the color of printed and dyed textiles to maintain a certain degree of fastness.

Color fastness test items

Washing color fastness: The sample is sewn together with the standard lining fabric, washed, washed and dried, and washed under suitable temperature, alkalinity, bleaching and friction conditions, so that the test results can be obtained in a short time .Use machine: color fastness to washing GT-D07

Color fastness to dry cleaning: Same as color fastness to washing, except that washing is changed to dry cleaning.Use GESTER machine:Dry Cleaning And Washing Cylinder GT-C36

Color fastness to rubbing: Put the sample on the rubbing fastness meter, rub it with a standard white cloth under a certain pressure for a certain number of times. Each group of samples needs to be dry rubbing color fastness and wet rubbing color fastness. The color stained on the standard rubbing white cloth is graded with a gray card, and the grade obtained is the measured rubbing color fastness. The color fastness to rubbing needs to be tested for dry rubbing and wet rubbing. All the colors on the sample must be rubbed. Use machine: Electronic Crockmeter GT-D04

Light fastness: Textiles are usually exposed to light when they are in use. Light can destroy dyes and cause the well-known "fading", which makes colored textiles lighter and darker, and some color changes will also occur. , It is necessary to test the color fastness. The light fastness test is to put the sample and blue wool standard cloth of different fastness grades together under the specified conditions for sunlight exposure, and the sample and the blue wool The cloth is compared to evaluate the light fastness. The higher the blue wool standard cloth, the better the light fastness. Use machine: Air-Cooled Light Fastness Tester GT-D02A-1

Color fastness to perspiration: sew the sample together with the standard lining fabric, put it in a sweat solution, and place it on the perspiration fastness tester, put it in an oven at a constant temperature, then dry, and grade it with a gray card. Get the test results. Different test methods have different perspiration liquid ratios, different sample sizes, and different test temperatures and times. Use GESTER machine:Perspiration Tester GT-D09

Color fastness to water stains: Test as above with water-treated samples.

Color fastness to chlorine bleaching: After washing the fabric in a chlorine bleaching solution under certain conditions, evaluate the degree of color change, which is the color fastness to chlorine bleaching.

Color fastness to non-chlorine bleaching: After the fabric is washed under washing conditions with non-chlorine bleaching, the degree of color change is evaluated. This is the color fastness to non-chlorine bleaching.

Pressing color fastness: After covering the dry sample with a cotton lining fabric, press it for a certain period of time in a heating device at a specified temperature and pressure, and then use a gray scale to evaluate the color change of the sample and the staining of the lining fabric. The color fastness of hot pressing includes dry pressing, wet pressing, and wet pressing. The specific test method should be selected according to different customer requirements and test standards.

Color fastness to saliva: Attach the sample to the specified lining fabric, treat it in artificial saliva, remove the test solution, place it between the two plates in the test device and apply the specified pressure, and then place the sample Dry the lining fabric separately, and use a gray card to evaluate the discoloration of the sample and the staining of the lining fabric.

GESTER Instrument Equipment Co., Ltd. is a manufacturer of textile testing equipment , which can provide various color fastness tester. For more product information consultation:sales@gester-instruments.com