we are the larger factory for sodium sulphite anhydros which is used in paper making the purity is 96% or 98%min Product name:  Sodium Sulfite Anhydrous, Sodium Sulphite Anhydrous 

Molecular formula : Na2SO3

Appearance : white crystalline powder

Quality standard: HG/T 29672000

Sepcification:

Index name	Premium grade
	Super grade	First grade	Salable product	Industrial grade
Sodium sulfite ( Na2SO3 ) , % ≥	97.0	96.0	93.0	90.0
Fe , ≤	0.003	0.005	0.01	/
Water insoluble matter , % ≤	0.02	0.03	0.05	/
Free alkali ( as Na2SO3 ) , % ≤	0.10	0.40	0.60	/
Na2SO4 , % ≤	2.50	/	/	/
NaCl , % ≤	0.10	/	/	/

Packing: double-layer plastic woven bag.

Uses : used in papermaking,  leather, printing, dyeing, bleaching and food .

sodium sulphite anhydrous