Appearance：Yellow liquid
Assay：≥94%               
Color：≤ 7
Transmittance:
460nm: ≥95%
500nm: ≥97%

Appearance：Yellow liquid
Assay：≥85%               
Ash：≤ 0.1%
Transmittance:
460nm: ≥95%
500nm: ≥97%

Appearance：Off-white powder
Assay：≥99%
Melting point：155-158°C
Volatiles：≤ 0.5%

Appearance：Pale yellow liquid
Active assay：≥93%
Ash：≤ 0.1%
Viscosity：≤ 7000mPa.s
Transmittance：
460nm: ≥95%
500nm: ≥97%

Appearance：Pale yellow crystal
Assay：≥99%
Melting point：142-146°C
Volatiles：≤ 0.2%
Heavy metal：≤ 5ppm
Color：≤ 3

Appearance：Pale yellow powder
Assay：≥99%
Melting point：≥195°C
Moisture：≤ 1%
Color：≤ 4

Appearance：Pale yellow powder
Assay：≥99%
Melting point：62-64°C
Volatiles：≤ 0.5%
Heavy metal：≤ 5ppm

Appearance：Off-white powder
Assay：≥99.5%
Melting point：≥160°C
Volatiles：≤ 0.5%
K value：46-50
pH:1.2-2.2
Color：≤ 4
Heavy metal：≤ 200ppm

Appearance：Pale yellow powder
Assay：≥90%
Volatiles：≤ 2%
pH:5-7
Heavy metal：≤ 10ppm

Appearance：Pale yellow powder
Assay：≥98%
Melting point：≥134°C
Volatiles：≤ 0.5%
K value：≥49
Color：≤ 4
Transmittance：
300-400nm: ≤ 1%
450-550nm: ≥90%
500nm+:≥95%