industrial
pharma

Sulfurous acid

CAS 7782-99-2

Also registered as 15 other CAS numbers

21093-41-4 · 63921-72-2 · 65003-85-2 · 66085-60-7 · 68720-49-0 · 70074-94-1 · 75481-08-2 · 80879-60-3 · 104927-19-7 · 110883-84-6 · 111910-53-3 · 125289-32-9 · 152463-65-5 · 1087413-38-4 · 2650417-68-6

Concern score

Not assessed — no hazard data yet.

Sulfurous acid in plain language

What it is: Also known as (SO(OH)2) · Acide sulfureux · H2SO3 · S(O)(OH)2 · Schweflige saeure 5%IGE loesung · Sulfurous acid (H2SO3)
Show all 16 names
Schweflige saure · Schwefligesaure · Un 1833 · UNII-J1P7893F4J · acido sulfuroso · dihydroxidooxidosulfur · schweflige Saeure · sulphurous acid · trioxosulfuric acid · Sulphurosum acidum
What it does: We don't have a plain-language description for Sulfurous acid yet.
Is it a concern?: We haven't assessed a concern score for this ingredient yet.

Regulation

No restrictions found. Sulfurous acid appears in these published regulatory listings.

Inactive ingredient in US drugs

Recorded in these product areas

Found in consumer products
Industrial

USEPAcommercial use observedEPA CPDat observed this chemical in 6 composition records across product categories including Batteries, Laboratory supplies.
- EPA CPDat observed this chemical in 6 composition records across product categories including Batteries, Laboratory supplies.Source →
USFDAinactive ingredient databaseRoute: INTRAMUSCULAR; Dosage form: INJECTION; Potency: ADJ PH
- Route: INTRAMUSCULAR; Dosage form: INJECTION; Potency: ADJ PHSource →
USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
- openFDA substance registry classifies this ingredient as chemical.Source →

Evidence & sources

No graded research studies for Sulfurous acid yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

6 data sources

Where this comes from

EPA Chemical and Products Database
exposure · updated January 7, 2008
Open →
EPA DSSTox Identifiers
chemistry · updated 2025-12-29
Open →
FDA Inactive Ingredient Database
regulatory · updated 2026-01-09
Open →
FDA GSRS UNII
registry · updated 2026-02-26
Open →
openFDA Substance
registry · updated 2026-05-24
Open →
PubChem Live Enrichment
chemistry · updated 2026-05-17
Open →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

Nothing to weigh for this context yet.

No signal in this context

We have no published hazard signal for this ingredient, so we cannot say how it behaves in this context — that is missing evidence, not a clean result.

Where it has been recorded

How often EPA CPDat has listed Sulfurous acid in a product composition. These are source records, not Greenveil catalog products.

Source records

Named organisations

BatteriesLaboratory supplies

See products using Sulfurous acid →