Biochemical properties	Điều kiện kiểm tra	Phương pháp kiểm tra	North Yuan Chemical/SG7
Number of impurity particles	一等品		≤40 个
Number of impurity particles		合格品		≤100 个
Residual vinyl chloride content	优等品		≤8 ppm
Sieve residue	优等品，0.25mm筛孔		≤2 %
Whiteness	合格品		- %
Volatile compounds	一等品		≤0.4 %
fisheye	优等品		≥30 个/400cm
Residual vinyl chloride content	一等品		≤10 ppm
Volatile compounds	优等品		≤0.4 %
Sieve residue	一等品，0.25mm筛孔		≤2 %
Residual vinyl chloride content	合格品		- ppm
fisheye	一等品		≥50 个/400cm
Sieve residue	合格品，0.063mm筛孔		≥80 %
		合格品，0.25mm筛孔		≤8 %
		优等品，0.063mm筛孔		≥90 %
Whiteness	优等品		≥70 %
Number of impurity particles	优等品		≤20 个
Volatile compounds	合格品		≤0.5 %
fisheye	合格品		- 个/400cm
Sieve residue	一等品，0.063mm筛孔		≥90 %
Whiteness	一等品		- %