Product Grade:

Photo-taking grade and technical grade.

Use:

Can be used as intermediates of polymer, monomer inhibitor, dyes and auxiliary; as antioxidant in food and medicine industry; as anti coagulant for gas; developer for film, photos and X-ray film.

 

 

Quality standard

1, Photo-taking grade(GB10552-89)

Index items	Index(%)
Appearance	White needle crystal
Hydroquinone(HOC6H4OH) content	99.0~101.0
Melting point	171°C~175°C
Solubility	Qualified
Residue on ignition≤	0.05
Heavy Metal(based on Pb)≤	0.002
Iron(Fe) ≤	0.002

2, Technical grade

Index items	Index(%)
Appearance	Grey or yellowish powdery crystal
Hydroquinone(HOC6H4OH) content	≥99
Melting point	≥169.5
Residue on ignition	≤0.3