Denim clothes is favored by consumers due to its casual, washable and wear-resistant features, and has become the only clothing product that has been popular for more than 100 years except suits. But jean also has a disadvantage that is poor color fastness. The quality is a little bit worse and jeans often wash and fade like this.

Today, GESTER will show you how to test the fastness of denim clothes to soap washing and how to prevent them from fading.

Test the color fastness of denim clothing to soap washing

Standard: ISO105 water color fastness test

Instrument: Washing color fastness tester, steel ball (diameter 6mm), color matching cabinet

Reagent :

(1) Soap: moisture content not more than 5%. According to the dry mass, it should meet the following requirements: free alkali (Na2CO3) 0.3%; Free base (NaOH) 0.1%; Total fat content 850g/kg;Iodine value 50; No fluorescent whitening agent.

(2)Anhydrous sodium carbonate (analytically pure).

(3)Soap:① methods of A 40 ℃, 5 g/L liquid soap; ②methods of C 60 ℃, 5 g/L liquid soap to add 2 g/L anhydrous sodium carbonate mixture.

Sample: 4 *10 cm cowboy sample

Standard: a standard single fiber affixed lining or affixed lining

Test steps: according to the sample ISO105 textile color fastness test with one or two pieces of affixed lining fabric stitch together. Then put it into the soap. At the prescribed time and temperature. The first wash, rinse thoroughly and dry, with grey sample card to evaluate the sample color and lining fabric color.

Cut the sample into 4cm x 10cm according to the standard and sew on the lining.

Place the sewn sample and washing solution in a stainless steel container and wash for 30min.

After washing and drying, use the color assessment cabinet for grading.

GESTER is a leading and outstanding company that manufactures and supplies all kinds of textile testing equipment.Our machines comply with ISO, ASTM, AATCC, BS, EN, DIN, JIS and other requirements.With the development of economic globalization, only strict control of textile quality can make enterprises stand out from the market competition.We strive to exceed customer expectations and constantly develop new technologies.