Industrial chemicals · Taylor, TXTechnical Data Sheet
Technical Data Sheet
Sodium Bisulfite 40% ACS Grade
ACS Grade · 40%
- CAS number
- 7631-90-5
- UN number
- UN2693
- Hazard class · packing group
- 8 · PG III
- Structure
Structure · PubChem - Grade
- ACS Grade · 40%
- Signal word
- Danger
- Hazards
- Proper shipping name
- Bisulfites, aqueous solutions, n.o.s. (Sodium bisulfite)
Last reviewed 2026-07-17 by Andre Taki, Chief Commercial Officer.
Identity & Composition
- Product Name
- Sodium Bisulfite 40% ACS Grade
- Alliance Code
- sodium-bisulfite-40-acs-grade
- Grade
- ACS Grade
- Concentration
- 40%
- CAS Number
- 7631-90-5PubChem
- Formula
- —PubChem
- Molecular Weight
- 104.06PubChem
- Product Type
- Solution
Specifications
| Test | Specification | Typical | Method | Source |
|---|---|---|---|---|
| Assay (NaHSO3) | 39.5 - 40.5 % by wt | 40.07 % | — | Interpreted |
| Chloride (Cl) | ≤ 0.008 % | 0.00052 % | — | Interpreted |
| Heavy metals (as Pb) | ≤ 0.0004 % | 0.00011 % | — | Interpreted |
| Insoluble matter | ≤ 0.002 % | 0.00047 % | — | Interpreted |
| Iron (Fe) | ≤ 0.0008 % | 0.00010 % | — | Interpreted |
| Sulfur dioxide (SO2), available | 24.3 - 24.9 % by wt | 24.7 % | Iodometric titration (I2 / Na2S2O3 back-titration) | 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 Grade | 40% | — | current | current |
| Technical | 40% | — | sodium-bisulfite-40 | View TDS → |
| ACS | 25% | — | sodium-bisulfite-25-acs-grade | 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 to pale yellow liquid | Adjudicated |
| Form | Liquid | Published reference |
| Odor | Pungent, sulfur dioxide odor | Adjudicated |
| pH | 3.5–5.0 | Adjudicated |
| Specific Gravity | 1.32–1.35 at 20 °C (water = 1) | Adjudicated |
| Density | 1.32-1.35 g/cm³ (20°C) | Published reference |
| Boiling Point | About 100–104 °C (212–219 °F), with release of sulfur dioxide | Adjudicated |
| Melting Point | About 5 °C (41 °F), crystallization point; keep from freezing | Adjudicated |
| Flash Point | Not applicable | Adjudicated |
| Vapor Pressure | About 18–32 mmHg at 20 °C (water and sulfur dioxide) | Adjudicated |
| Solubility (water) | Completely miscible with water | Adjudicated |
| Viscosity | 3.6 mPa·s at 20 °C | Adjudicated |
Materials of Construction
| Material | Rating | Conditions | Source |
|---|---|---|---|
| stainless steel (alloy grade not specified) | Compatible | Sodium bisulfite solution 38.0–42.0 wt. %, as shipped in tank truck or railcar; no temperature stated | ineos.com |
| plastic (polymer not specified in source) | Compatible | Sodium bisulfite solution 38.0–42.0 wt. %, as shipped in 55 gallon plastic drums; no temperature stated | ineos.com |
Compatibility is drawn from published manufacturer and supplier documentation for this product; each rating is sourced. Confirm against your specific duty cycle before equipment selection.
Regulatory & Transport
DOT / 49 CFR
- UN Number
- UN269349 CFR 172.101
- 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
- 5 mg/m³ TWAAdjudicated
- 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.
Health & Fire Hazard
Acute Toxicology
- LD₅₀ Oral (rat)
- 1,310–2,610 mg/kg (as sodium bisulfite)Adjudicated
- LD₅₀ Dermal (rabbit)
- > 2,000 mg/kg (rat)Adjudicated
- LC₅₀ Inhalation (rat, 4 h)
- > 5.5 mg/L (rat, 4 h)Adjudicated
Acute toxicology values from SDS Section 11 or NIOSH RTECS.
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 40% ACS Grade. Every file included is SHA-256 hashed and listed in a manifest your QA team can audit.
Applications
- Dechlorination in municipal wastewater, pulp & paper, power, and textile water treatment plantsineos.com
- Oxygen scavenger and boiler water treatmentineos.com
- Preservative in the photo developer processineos.com
- Flue gas desulfurizationineos.com
- Food additive (source is a sodium bisulfite solution stated to meet FCC, ACS and/or USP specifications; grade-scoped to ACS handles)ineos.com
- Laboratory, research, or manufacturing use (ACS reagent grade material)digitalassets.avantorsciences.com
Applications are drawn from published manufacturer and supplier documentation; each is sourced. Suitability for a specific use is the buyer's to confirm.
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.
NMFC Class
65
Placard
Corrosive
Packing Group
PG III
Revision History
Last reviewed 2026-07-17 by Andre Taki, Chief Commercial Officer, DOT Hazmat–certified (49 CFR 172.704).
| Version | Date | Change | Trigger |
|---|---|---|---|
| 1.7 | 2026-10-08 | Canonical data updated: 22 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.6 | 2026-10-07 | Canonical data updated: 3 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.5 | 2026-10-05 | Canonical data updated: 1 field changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.4 | 2026-09-30 | Canonical data updated: 3 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.3 | 2026-08-05 | Canonical data updated: 3 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.2 | 2026-07-22 | Canonical data updated: 1 field changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.1 | 2026-07-17 | Canonical data re-verified: 6 fields updated against independent vendor SDSs, CLP Annex VI, 49 CFR, and OSHA HazCom 2024 (GHS classification, hazard/precautionary codes, signal word, physical properties as applicable).
| canonical_change |
| 1.0 | 2026-05-20 | Initial URL-first TDS published from canonical chemistry registry. | initial |
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.