Project | Unit | For food packaging | Non-food packaging use | |||||
Copolymerization | Homopolymerization | |||||||
Premium | Qualified product | Premium | Qualified product | Qualified product | ||||
1 | Intrinsic viscosity | dL/g | M1±0.015 | M1±0.020 | M1±0.015 | M1±0.020 | M1±0.020 | |
2 | Acetaldehyde content | ug/g | ≤1.0 | - | ||||
3 | Chroma | b value | ≤2.0 | ≤3.0 | ||||
4 | L value | ≥80 | ||||||
5 | Diethylene glycol content (mass fraction) | % | M2±0.2 | M2±0.3 | M2±0.2 | M2±0.3 | M2±0.3 | |
6 | Carboxyl terminal content | mmol/kg | ≤35 | |||||
7 | Melting point (DSC method) | ºC | M3±2 | |||||
8 | Granular appearance | powder | mg/kg | ≤100 | ||||
9 | Heterochromatic particles | Grain/500g | ≤1 | ≤1 | ≤1 | |||
10 | Moisture (mass fraction) | % | ≤0.4 | |||||
11 | density | g/cm³ | M4±0.01 | |||||
12 | Ash (mass fraction) | % | ≤0.08 | |||||
Note 1: In the items in this table, the acetaldehyde content requirements are mandatory, and the rest are recommended. Note 2: M1, M2, M3, and M4 are the nominal values of this indicator for each grade of product. |