O. ITEM TEST METHOD UNIT RANGE

1 I/V Intrinsic viscosity GB/T 17931-2018 dl/g

0.80±0.015

ASTM 0.78±0.015

2 MELTING POINT GB/T 17931-2018 °C 249±2

3 ACETALDEHYDE Acetaldehyde content GB/T 17931-2018 ug/g ≤1.0

4 COOH CONTENT Carboxyl terminal GB/T 17931-2018 mol/t ≤35

5 COLOR Color value-B value GB/T 17931-2018 b-value ≤0

Color value-L value GB/T 17931-2018 L-value ≥82

6 DEG Diethylene glycol content GB/T 17931-2018 wt% 1.3±0.2

7 MOISTURE Moisture GB/T 17931-2018 wt% ≤0.2

8 ASH Ash content GB/T 17931-2018 % ≤0.05

9 DUST Powder GB/T 17931-2018 mg/kg ≤50