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I.V. dL/g 0．80±0.02
Crystallinity % ≤60
Color value L ≥83
Color value L ≥83
Color value B ≤1.0
Content of COOH, mol/t ≤25
Content of acetaldehyde ,ppm ≤1.0
Dust content,ppm ≤100
Melting point , ℃ 249±2
Wt,of 100 chips % , g 1.55±0.10