Industrial chemicals · Taylor, TXTechnical Data Sheet
Sodium Metabisulfite - ACS Grade
ACS Grade
Identity & Composition
- Product Name
- Sodium Metabisulfite - ACS Grade
- Alliance Code
- sodium-metabisulfite-acs-grade
- Grade
- ACS Grade
- Concentration
- —
- CAS Number
- 7681-57-4PubChem
- Formula
- Na2O5S2PubChem
- Molecular Weight
- 190.11PubChem
- Product Type
- pure_substance
Specifications
| Test | Specification | Typical | Method | Source |
|---|---|---|---|---|
| Assay (Na2S2O5) | Min. 97.0% | 98.6% | — | ACS Reagent Chemicals |
| Chloride (Cl) | Max. 0.05 % | 0.003 % | — | Supplier specification |
| Heavy metals (as Pb) | Max. 0.001 % | 0.0001 % | — | Supplier specification |
| Identification | Pass Test | Passes test | — | Supplier specification |
| Insoluble matter | Max. 0.005 % | 0.0008 % | — | Supplier specification |
| Iron (Fe) | Max. 0.002 % | 0.0002 % | — | Supplier specification |
| Thiosulfate (S2O3) | Max. 0.05 % | 0.005 % | — | Supplier specification |
| Sulfur dioxide (SO2), available | Min. 65.0% | 66.4% | 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 | — | — | current | current |
| Food Grade | — | — | sodium-metabisulfite-food-grade | View TDS → |
| Technical Grade | — | — | sodium-metabisulfite-technical-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 | White to yellowish | Supplier specification |
| Odor | In the presences of traces of water, it develops an odor of sulfur dioxide | Published reference |
| pH | 4 to 6 | Supplier specification |
| Density | 1.4 (NIOSH, 2024) - Denser than water; will sink | Published reference |
| Boiling Point | Decomposes (NIOSH, 2024) | Published reference |
| Melting Point | greater than 302 °F (Decomposes) (NIOSH, 2024) | Published reference |
| Solubility (water) | Clear, colorless to faintly yellow solution | Interpreted |
Materials of Construction
| Material | Rating | Conditions | Source |
|---|---|---|---|
| glass (glass bottle packaging) | Compatible | dry solid ACS-grade powder as supplied; source states packaging only, no concentration or temperature | fishersci.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
- Not regulatedAdjudicated
- Hazard Class
- Not regulatedAdjudicated
- Packing Group
- Not regulatedAdjudicated
- Proper Shipping Name
- Not regulatedAdjudicated
GHS / OSHA HazCom 2012
- Signal Word
- DangerAdjudicated
- H-Codes (Hazard Statements)
- H302, H318Adjudicated
- P-Codes (Precautionary Statements)
- P264, P270, P280, P301+P312, P305+P351+P338, P313, 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 Metabisulfite - ACS Grade. Every file included is SHA-256 hashed and listed in a manifest your QA team can audit.
Applications
- Used as an antioxidant, disinfectant or preservative agent (ACS/reagent grade material)labdepotinc.com
- High-purity laboratory applications, where ACS-grade specifications are the reference standardlabdepotinc.com
- Oxygen scavenging in steam boiler water treatment and removal of excess chlorine from wastewateressecousa.com
- Reducing and sulfonating agent in chemical processing, including surfactants and polymerizationessecousa.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 light-resistant containers; material is light sensitive and air sensitivelabdepotinc.com
- 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)
Not regulated for transport.
Confirm against shipping documents and carrier requirements before tender.
Freight classification is a fallback estimate. Verify with carrier before tender.
Revision History
Last reviewed 2026-07-17 by Andre Taki, DOT Hazmat Specialist.
| Version | Date | Change | Trigger |
|---|---|---|---|
| 1.1 | 2026-07-17 | Canonical data re-verified: 7 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.