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2-Naphthol-3,6-Disodium Disulfonate

Alias R Salt, R Acid
CAS No. 135-51-3
Molecular Formula C10H6O7S2Na2
Molecular weight 348
Structure
Uses To produce edible pigment and acid-dyes, as well as light-sensitive copying paper after reacting with diazo salt.
Specifications
Spec./Item Appeatance Content Purity (HPLC) Schaeffer's salt Iron
60% greyish
white
powder		 60% min 98% min 1.5% max  
80% common 80% min 98% min 1.0%% max  
80% low Fe+ 80% min 98% min 0.8%% max 100ppm% max
80% low Fe+ 80% min 98% min 0.5%% max 30ppm% max
90% 90% min 98.5% min 0.5%% max  
Packing 25kgs net plastic woven bags lined with plastic bags.
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