Preprocessing method.

Different sample pre-treatment methods are specified.

The pretreatment method is to simulate the actual wearing and using conditions of textiles. Appendix B method is to extract dyes from fibers.

Different sample pretreatment methods will result in different results.

Pure polyester products are processed according to appendix B. Other products are processed according to the method stipulated by 6.1.1, but this regulation is limited to domestic sales.

For export products, they should be tested according to the regulations or standards of the exporting countries.

For example, the products exported to European Union countries are best judged according to the description of the process or the experience of the operator, and then determine whether the dye should be extracted from the fiber and reduced by the appendix B.

Limit the value of decomposable aromatic amines.

The detection limit is 5mg/kg. When the detection value is <5mg/kg, the result is not detected. When the detection value is more than 5mg/kg, the actual detection results are reported.

However, it should be noted that the determination limit of GB/T17592 is 5mg/kg, which is not equal to the limit value of decomposable aromatic amines banned by GB18401. The limit value of decomposable aromatic amines on textile products is still 20mg/kg.

When executing GB18401, when the detection value is less than 20mg/kg, it is decided to meet the requirements; when the detection value is >20mg/kg, it is judged to be inconsistent with the requirements.

Unprocessed products.

Generally, products processed by coloring will be involved.

And pigments, banned azo dyes are also controlled against such coloured products.

However, it is also possible to detect decomposable aromatic amines in uncolored white or natural products, mostly due to other chemicals such as finishing agents, adhesives and so on.

Therefore, the detection of prohibited azo dye items is generally prohibited for uncolored products. Even if the aromatic amine can be decomposed, the dye or pigment should be analyzed.

If the product is not dyed or printed, the banned azo dye can be used.

It contains spandex products.

contain

Sometimes the products can be detected with decomposable aromatic amines. The results need to be analyzed to see whether they are the reason of the spandex itself or the banned azo dyes or pigments.

In general, if the decomposable aromatic amine containing spandex products exceeds the standard, the spandex can be removed and tested without any spandex. If the products without spandex are not detected, it can be judged that the decomposable aromatic amine of the product is caused by spandex and is not prohibited by azo dyes, and is indicated in the test report.