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1, Photo-taking grade(GB10552-89)
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Index items
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Index(%)
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Appearance
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White needle crystal
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Hydroquinone(HOC6H4OH) content
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99.0~101.0
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Melting point
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171°C~175°C
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Solubility
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Qualified
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Residue on ignition ≤
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0.05
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Heavy Metal(based on Pb) ≤
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0.002
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Iron(Fe) ≤
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0.002
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2, Technical grade
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Index items
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Index(%)
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Appearance
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Grey or yellowish powdery crystal
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Hydroquinone(HOC6H4OH) content
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≥99
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Melting point
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≥169.5¡æ
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Residue on ignition
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≤0.3
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Packing:
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In PP woven bags with Kraft paper bag in the middle and two-ply inner PE bags. N.W.:25kg per bag.
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Use:
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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.
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