Industrial chemicals · Taylor, TXTechnical Data Sheet
Sodium Bisulfite 40% ACS Grade
ACS Grade · 40%
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
- HNaO3SPubChem
- Molecular Weight
- 104.06PubChem
- Product Type
- solution
Specifications
| Test | Specification | Typical | Method | Source |
|---|---|---|---|---|
| Assay (NaHSO3) | 39.5 - 40.5 % by wt | 40.0 % | — | Commercial practice |
| Chloride (Cl) | ≤ 0.008 % | 0.0005 % | — | Derived by dilution |
| Heavy metals (as Pb) | ≤ 0.0004 % | 0.0001 % | — | Derived by dilution |
| Insoluble matter | ≤ 0.002 % | 0.0004 % | — | Derived by dilution |
| Iron (Fe) | ≤ 0.0008 % | 0.00012 % | — | Derived by dilution |
| Sulfur dioxide (SO2), available | 24.3 - 24.9 % by wt | 24.6 % | Iodometric titration (I2 / Na2S2O3 back-titration) | Interpreted |
Specification values are guaranteed limits. Typical values are representative of production lots and are not guaranteed. Lot-specific certificates of analysis ship with every order.
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, colorless to light-yellow liquid | Published reference |
| Form | Liquid | Published reference |
| Odor | Slight sulfur dioxide odor | Published reference |
| pH | 3.8 - 5.0 | Interpreted |
| Specific Gravity (20 °C) | 1.325 - 1.345 | Interpreted |
| Density | 1.32-1.35 g/cm³ (20°C) | Published reference |
| Boiling Point | ~100-103 °C | Published reference |
| Melting Point | < 0 °C | Published reference |
| Flash Point | Not applicable (non-combustible aqueous solution) | Published reference |
| Solubility (water) | Miscible with water | Published reference |
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 HazCom 2012
- Signal Word
- DangerAdjudicated
- H-Codes (Hazard Statements)
- EUH031, H302, H318Adjudicated
- P-Codes (Precautionary Statements)
- P264, P270, P301+P312, P330, P501Adjudicated
Occupational Exposure Limits
- OSHA PEL (29 CFR 1910.1000)
- —no canonical
- ACGIH TLV
- —no canonical
- NIOSH REL
- —no canonical
- NIOSH IDLH
- —no canonical
Transport descriptions reflect 49 CFR 172.101 lookup at time of publication. Sourced data: ECHA CLP Annex VI for harmonised classifications, 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 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
- Cool, dry, well-ventilated area in original sealed containers. Refer to product SDS for material-specific guidance.Class-level guidance — not product-specific; the SDS controls.
- 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
- Consult the SDS for material-specific incompatibilities.Class-level guidance — not product-specific; the SDS controls.
- 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
Last reviewed 2026-07-17 by Andre Taki, DOT Hazmat Specialist.
| Version | Date | Change | Trigger |
|---|---|---|---|
| 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.