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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) | ℃ | M3±2 | |||||||||||||
8 | Granular appearance | powder | mg/kg | ≤100 | ||||||||||||
9 | Heterochromatic particles | Grain/500g | None | ≤1 | None | ≤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, M₃, and M4 are the nominal values of this indicator for each grade of product. | ||||||||||||||||












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