Polyamide|synthetic Fibres|Nylon Yarn|Nylon Fibe

Item

Superior

First grade

Qualified

Test method

Color(in 50% water solution),Hazen(pt-co scale) ≤

3

5

10

GB/T 13255.1

Solidification point, ???≥

68.9

68.8

68.5

GB/T 13255.2

PM number ≤

5

10

20

GB/T 13255.3

Volatile base, mmol/kg  ≤

0.4

0.8

1.5

GB/T 13255.4

Extinction at 290nm  ≤

0.04

0.10

0.20

GB/T 13255.5

Acidity, mmol/kg

0.10

0.20

—

GB/T 13255.6

Acidity, mmol/kg

0.10

0.20

—

GB/T 13255.6

Fe content, 10-6

0.2

0.50

1.0

GB/T 13255.7

Oxime content, 10-6  ≤

20

20

—

GB/T 13255.8