Sodium Hydrosulfite

Chemical Name: Sodium Hydrosulfite
Molecular Formula: Na₂S₂O₄
Molecular Weight: 174.11
CAS No. : 7775-14-6
Standard Executed: GB 22215-2008,GB/T 2074-2011

Appearance
White crystalline powder

Application
• Widely used in textile industry for reductive dyeing, reductive cleaning, printing and decolorization and bleaching of fabrics;
• Bleaching agent for wood pulp and paper making, bleaching and reducing whitening of kaolin and fur;
• It can also be used for food bleaching，Preventing oxidation of foodstuffs，Maintaining food color.

Packing
• Net weight：15，25，50，100kg；
• Iron drums lined with double PE plastic bags.

Specification

Item	Standard
	Food grade	Industrial grade
	Food grade	High-Class	First-Class
Sodium dithionite (Na₂S₂O₄), ω/% ≥	88.0	90.0	88.0
Clarity	Pass test	---	---
Heavy metals (as Pb), ω/% ≤	0.001	---	---
Lead (Pb), ω/% ≤	0.0005	---	---
Cadmium (Cd), ω/% ≤	0.0002	---	---
Arsenic (As), ω/% ≤	0.0001	---	---
EDTA, ω/%	Qualified	---	---
Zinc (Zn), ω/% ≤	0.03	---	---
Formate (as HCHO), ω/% ≤	0.005	---	---

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