Test of textile fastness to nitrogen oxide, smoke, ozone, etc.

The purpose of the color fastness test of textiles to atmospheric pollutants is to determine the ability of colored textiles to resist the effects of atmospheric pollutants. Atmospheric pollutants mainly include nitrogen oxide, gas smoke, atmospheric ozone, and high-humidity nitrogen oxide.

1. Resistance to nitrogen oxide gas:

The textile sample is placed in a closed container filled with nitrogen oxide gas. When the color of one or three control samples tested at the same time as the sample fades to a specified degree, stop. Use a gray sample card to evaluate the color change of each sample.

2. Color fastness to gas smoke:

The textile sample and the control sample are placed in gas smoke at the same time, and the color of the control sample changes to a color equivalent to the fading standard. Use a gray sample card to evaluate the color change of the sample. If no color change of the sample is observed after one test cycle, the test cycle can be continued for a specified number of times, or the number of test cycles required to produce the specified color change of the sample.

3. Color fastness to atmospheric ozone:

A sample and a control standard are placed in an ozone test chamber at ambient room temperature and in an atmosphere with a relative humidity not exceeding 65%, until the color of the control standard fades to the same as the fading standard. This test phase is one cycle. Repeat the cycle until the sample reaches the specified color change or reaches a predetermined number of cycles.

4. Color fastness to high humidity nitrogen oxides:

The sample and the control standard are simultaneously exposed to a constant environment filled with nitrogen oxide gas, with a relative humidity of 87.5%±2.5% and a temperature of 40℃±1℃, until the color change of the control standard is consistent with the fading reference standard. The above procedure can be repeated until the color change of the sample reaches the predetermined color change or to the predetermined number of cycles.

Smoke fastness of reactive dyes:

Reactive dye dyes are exposed to air, in addition to oxygen, nitrogen and water vapor, they will also be exposed to some oxidizing gases and acidic gases. Because the air often contains nitrogen and sulfur oxides, especially in industrial cities, these oxidizing gases are high in content and can react with dyes in many ways. Nitrogen oxides are particularly prone to cause discoloration of reactive dyes and accelerate their fading. One of the reasons is that it causes the amino groups in some dye molecules to undergo diazotization and the secondary amino groups to undergo nitrosation, which will cause the dye to change color and reduce the light fastness of the dye.

Related test standards:

GB/T 11039.1-2005 Textiles - Tests for color fastness - Color fastness to atmospheric pollutants - Part 1: Nitrogen oxides

GB/T 11039.2-2005 Textiles - Tests for color fastness - Color fastness to atmospheric pollutants - Part 2: Gas smoke

GB/T 11039.3-2005 Textiles - Tests for color fastness - Color fastness to atmospheric pollutants - Part 3: Atmospheric ozone

GB/T 11039.4-2014 Textiles - Tests for color fastness - Color fastness to atmospheric pollutants - Part 4: High humidity nitrogen oxides

ISO 105-G01 Textiles - Tests for color fastness - Part G01: Color fastness to nitrogen oxides

ISO 105-G02 Textile and printing industry - Tests for color fastness - Part G02 Color fastness to combustion smokeISO 105-G03 Textile and printing industry - Tests for color fastness - Part G03 Color fastness to atmospheric ozone ISO 105-G04 Textile and printing industry Color fastness test Part G04 Color fastness to high humidity nitrogen oxides