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Sulfates and sulfur salts

Zinc dithionite

Also known as Dithionous acid, zinc salt (1:1), Zink dithionit, Ditionito de cinc

CAS 7779-86-4Formula O4S2ZnMolar mass 193.52 g/molEC 231-942-2
3 suppliers listed
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Zinc dithionite chemical structure, O4S2Zn, CAS 7779-86-4
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
White amorphous solid
Solubility
28.00 lb/100 lb water at 68 °F
HS code
283190
Category
Sulfates and sulfur salts
UN number
UN 1931
Illustrative photo, fine white powder in an amber glass reagent bottle on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Zinc dithionite?

Plain description, key identifiers and synonyms

Zinc dithionite is a white powder. It is noncombustible. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. It is used to bleach wood pulp, textiles, and other naturally occurring materials.

Identifiers

Registry numbers, names and line notations, tap to copy

CAS number
7779-86-4 CAS number cross-checked
EC number
231-942-2
Molecular formula
O4S2Zn
UNII
J5XTW55OEM
InChIKey
PENRVBJTRIYHOA-UHFFFAOYSA-L
InChI
InChI=1S/H2O4S2.Zn/c1-5(2)6(3)4;/h(H,1,2)(H,3,4);/q;+2/p-2
SMILES (canonical and isomeric)
[O-]S(=O)S(=O)[O-].[Zn+2]

Synonyms

  • Dithionous acid, zinc salt (1:1)
  • Zink dithionit
  • Ditionito de cinc
  • Dithionite de zinc
  • Zink dithionit (German)
  • ZnS2O4
  • Dithionite de zinc (French)
  • Ditionito de cinc (Spanish)
  • Tetrakis(monothiosulfato(2-))dizincate(4-)
  • Tetrakis(monothiosulfato(2-))di-Zincate(4-)
  • Zinkdithionit

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
White amorphous solidexp.
Odour
Slight sulfur dioxide odorexp.
Solubility
28.00 lb/100 lb water at 68 °Fexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
193.52 g/molcalc.
Exact mass
191.8529 Dacalc.
LogP (octanol/water)
-1.34calc.
Topological polar surface area
80.26 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
1calc.
Heavy atoms
7calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
2calc.
Components
2calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS classification
Hazard pictograms
UN number
UN 1931
Transport hazard class
9

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Zinc dithionite suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 3 suppliers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

3 suppliers in 1 country

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Zinc dithionite price

Indicative price range per kg from live supplier offers

No published prices right now

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Uses and applications

What the substance is used for, by industry and function

Bleach, especially textile, paper, reducing agent.

Brightening groundwood, kraft, and other paper pulps, to treat beet and cane sugar juices, depressant in mining flotations, bleaching textiles, vegetable oils, straw, hemp, vegetable tannins, animal glue, etc.

Functional uses

  • Flavouring and nutrient

How it is made

Reaction of liquid sulfur dioxide with zinc dust.

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Zinc dithionite is traded under.

HS 2831.90Indicative HS code

Dithionites and sulphoxylates, other

World exports in 2024
$19.2M
−6.4% vs 2023, imports $18.5M
2019 to 2024
Top exporters
  1. China71.8%
  2. India * partner reported20.8%
  3. Turkey3.0%
Top importers
  1. Pakistan57.5%
  2. China9.4%
  3. Turkey7.0%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Zinc dithionite is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Zinc dithionite, based on the data on this page

What is Zinc dithionite?

Zinc dithionite is a white powder. It is noncombustible. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. It is used to bleach wood pulp, textiles, and other naturally occurring materials.

What is the CAS number of Zinc dithionite?

The CAS registry number of Zinc dithionite is 7779-86-4.

What is the molecular formula and weight of Zinc dithionite?

The molecular formula of Zinc dithionite is O4S2Zn and its molar mass is 193.52 g/mol.

What is Zinc dithionite used for?

Bleach, especially textile, paper, reducing agent. Brightening groundwood, kraft, and other paper pulps, to treat beet and cane sugar juices, depressant in mining flotations, bleaching textiles, vegetable oils, straw, hemp, vegetable tannins, animal glue, etc.

Is Zinc dithionite hazardous?

No GHS hazard classification for Zinc dithionite is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Zinc dithionite?

Zinc dithionite is usually classified under HS code 283190 (Dithionites and sulphoxylates, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Zinc dithionite?

CompoundList lists 3 suppliers of Zinc dithionite in United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Zinc dithionite?

Suppliers quote Zinc dithionite on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Zinc dithionite

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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