Industrial chemicals · Taylor, TXTechnical Data Sheet
Sodium Bisulfite 25% ACS Grade
ACS · 25%
- CAS number
- 7631-90-5
- UN number
- UN2693
- Hazard class · packing group
- 8 · PG III
- Structure
Structure · PubChem - Grade
- ACS · 25%
- Signal word
- Danger
- Hazards
- Proper shipping name
- Bisulfites, aqueous solutions, n.o.s. (Sodium bisulfite)
Identity & Composition
- Product Name
- Sodium Bisulfite 25% ACS Grade
- Alliance Code
- sodium-bisulfite-25-acs-grade
- Grade
- ACS
- Concentration
- 25%
- CAS Number
- 7631-90-5Adjudicated
- Formula
- HNaO3SAdjudicated
- Molecular Weight
- 104.06Adjudicated
- Product Type
- Solution
Specifications
| Test | Specification | Typical | Method | Source |
|---|---|---|---|---|
| Assay | 24.0 - 26.0 % | 24.9 % | — | Interpreted |
| Chloride (Cl) | 0.005 % max | 0.00021 % | — | Interpreted |
| Heavy metals (as Pb) | 0.00025 % max | 0.000068 % | — | Interpreted |
| Insoluble matter | 0.0013 % max | 0.00024 % | — | Interpreted |
| Iron (Fe) | 0.0005 % max | 0.000081 % | — | Interpreted |
| Composition | 25 % sodium hydrogen sulfite in deionized water, by weight | Conforms | By formulation; confirmed by specific gravity | Interpreted |
Values are reproduced from the current product reference. Source labels do not by themselves establish a supplier guarantee or a test result for your lot. Confirm applicable acceptance limits and request lot-specific documentation.
Available GradesSame CAS, alternate grades and concentrations
| Grade | Concentration | Typical Assay | SKU | TDS |
|---|---|---|---|---|
| This grade ACS | 25% | — | current | current |
| ACS Grade | 40% | — | sodium-bisulfite-40-acs-grade | View TDS → |
| Technical | 40% | — | sodium-bisulfite-40 | View TDS → |
| Technical | 25% | — | sodium-bisulfite-25 | View TDS → |
| Technical | 15% | — | sodium-bisulfite-15-technical-grade | View TDS → |
| ACS | 10% | — | sodium-bisulfite-10-acs-grade | View TDS → |
| Technical | 10% | — | sodium-bisulfite-10-technical-grade | View TDS → |
| ACS | — | — | sodium-bisulfite-15-acs-grade | View TDS → |
Typical assay shown is the rolling-window mean from the sibling product's most recent lots. Grade selection drives downstream end-use — verify the sibling grade matches your specification before substitution.
Physical & Chemical Properties
| Property | Value | Source |
|---|---|---|
| Appearance | Clear, colorless to light-yellow liquid | Published reference |
| Form | Liquid | Published reference |
| Odor | Slight sulfur dioxide odor | Published reference |
| pH | 3.5-5.0 | Published reference |
| Specific Gravity | ~1.20 | Published reference |
| Density | ~1.18-1.22 g/cm³ (25%, 20°C) | Published reference |
| Boiling Point | 100 to 103 °C (212 to 217 °F) (aqueous solution) | Adjudicated |
| Melting Point | -9 to 0 °C (16 to 32 °F), freezing point (aqueous solution) | Adjudicated |
| Flash Point | Not applicable (non-combustible aqueous solution) | Published reference |
| Solubility (water) | Miscible with water | Published reference |
Regulatory & Transport
DOT / 49 CFR
- UN Number
- UN2693Adjudicated
- Hazard Class
- 8Adjudicated
- Packing Group
- IIIAdjudicated
- Proper Shipping Name
- Bisulfites, aqueous solutions, n.o.s. (Sodium bisulfite)Adjudicated
GHS / OSHA HCS 2024
- Signal Word
- DangerAdjudicated
- H-Codes (Hazard Statements)
- EUH031, H302, H318Adjudicated
- P-Codes (Precautionary Statements)
- P264, P270, P280, P301+P312, P305+P351+P338, P310, P330, P501Adjudicated
Occupational Exposure Limits
- OSHA PEL (29 CFR 1910.1000)
- —no canonical
- ACGIH TLV
- —no canonical
- NIOSH REL
- 5 mg/m³ TWANIOSH Pocket Guide
- NIOSH IDLH
- —no canonical
Transport descriptions reflect 49 CFR 172.101 lookup at time of publication. Sourced data: NIOSH Pocket Guide for REL/IDLH, OSHA Z-Tables for PEL. Always verify against the latest regulatory text before shipment-critical decisions.
Supplier Qualification Packet
One zipped download containing the TDS, SDS, latest lot COA (when available), and a fresh Letter of Continuing Guaranty for Sodium Bisulfite 25% ACS Grade. Every file included is SHA-256 hashed and listed in a manifest your QA team can audit.
Application Guidance
Sodium Bisulfite 25% ACS Grade (ACS) application guidance is available on request. Contact Alliance Chemical Technical Services for grade-specific use recommendations.
Storage & Handling
- Recommended Storage
- Keep tightly closed in a cool, ventilated area in polyethylene, fiberglass or stainless-steel containers, away from acids and oxidizers. Protect from freezing (crystallizes near 5 °C).Adjudicated
- Handling Precautions
- Use standard chemical PPE — splash goggles, gloves, lab coat. Refer to SDS for hazard-specific PPE requirements.Class-level guidance — not product-specific; the SDS controls.
- Incompatibilities
- Acids (release toxic sulfur dioxide gas); oxidizing agents; nitrites and nitrates.Adjudicated
- Shelf Life
- Consult Technical Services for product-specific shelf life
For full hazard, PPE, and emergency response guidance, refer to the Safety Data Sheet (SDS) for this product. The SDS controls in all cases where guidance differs.
Packaging & Logistics
Shipping Description (US DOT)
UN2693, Bisulfites, aqueous solutions, n.o.s. (Sodium bisulfite), 8, PG III
Sourced from 49 CFR 172.101. Confirm against shipping documents and carrier requirements before tender.
Revision History
| Version | Date | Change | Trigger |
|---|---|---|---|
| 1.6 | 2026-10-13 | Canonical data updated: 4 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.5 | 2026-10-08 | Canonical data updated: 3 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.4 | 2026-10-07 | Canonical data updated: 3 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.3 | 2026-10-05 | Canonical data updated: 1 field changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.2 | 2026-09-30 | Canonical data updated: 2 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.1 | 2026-07-22 | Canonical data updated: 1 field changed via the provenance/adjudication pipeline.
| canonical_change |
This Technical Data Sheet is provided for technical reference. The Safety Data Sheet (SDS) controls in all cases where guidance differs. Values reflect Alliance Chemical canonical data at time of generation; subsequent revisions are recorded in the Revision History above.