Industrial chemicals · Taylor, TXTechnical Data Sheet
Sodium Thiosulfate Technical Grade
Reagent
Identity & Composition
- Product Name
- Sodium Thiosulfate Technical Grade
- Alliance Code
- sodium-thiosulfate
- Grade
- Reagent
- Concentration
- —
- CAS Number
- 7772-98-7PubChem
- Formula
- Na2O3S2PubChem
- Molecular Weight
- 158.11PubChem
- Product Type
- pure_substance
Specifications
| Test | Specification | Typical | Method | Source |
|---|---|---|---|---|
| Purity | 99% Minimum | 99.6 % | — | Supplier specification |
| Arsenic (As) | 0.001% Maximum | 0.00005 % | — | Supplier specification |
| Insoluble Matter | 0.01% Maximum | 0.002 % | — | Supplier specification |
| Iron (Fe) | 0.002% Maximum | 0.0003 % | — | Supplier specification |
| Particle Size | 10 mm – 12 mm | Passes test | — | Supplier specification |
| Sodium Thiosulfate (Na2S2O3) | 62% to 63.7% | 63.7 % | — | Supplier specification |
| Sulfide | Max. 0.001% | 0.00005 % | — | Supplier specification |
| Heavy Metals (Pb) | 0.003% Maximum | 0.0002 % | — | Supplier specification |
| Sodium Sulfite (Na2SO3) | 0.1% Maximum | 0.03 % | — | Supplier specification |
| Chloride (Cl) | 0.1% Maximum | 0.02 % | Turbidimetric vs. chloride standard (AgNO3) / argentometric titration | Interpreted |
| na2s2o3 | 99 % min | 99.6 % | — | Supplier specification |
| sulphide | 0.001 % max | 0.00005 % | — | Supplier specification |
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.
Physical & Chemical Properties
| Property | Value | Source |
|---|---|---|
| Appearance | Large Translucent Crystals | Supplier specification |
| Form | Solid | Published reference |
| pH | 6 – 8 | Supplier specification |
| Density | 1.05 - 1.25 g/cm3 | Interpreted |
| Boiling Point | 100°C | Published reference |
| Melting Point | 48.5 °C | Published reference |
| Flash Point | N/A | Published reference |
| Vapor Pressure | Vapor pressure at 20 °C: negligible | Published reference |
| Solubility (water) | PRACTICALLY INSOL IN ALCOHOL | Published reference |
Materials of Construction
| Material | Rating | Max T (°C) | Notes | Source |
|---|---|---|---|---|
Buna-N (NBR) elastomer | Good | 60 | Acceptable | Cole-Parmer Chemical Compatibility |
EPDM elastomer | Excellent | 100 | Standard for brine gaskets. | Parker O-ring Chemical Compatibility |
Viton (FKM) elastomer | Excellent | 100 | Preferred elastomer | Cole-Parmer Chemical Compatibility |
Borosilicate Glass glass ceramic | Excellent | 100 | Universally inert to salt solutions. | Cole-Parmer Chemical Compatibility |
Concrete (sealed) glass ceramic | Good | — | Acceptable with epoxy coating | Cole-Parmer Chemical Compatibility |
304 stainless steel metal | Fair | 25 | Pitting in chloride-rich service | Cole-Parmer Chemical Compatibility |
316L Stainless Steel metal | Good | 60 | Watch for chloride pitting above 60 °C in chloride salts. | NACE Chloride Pitting Guidelines |
Aluminium metal | Poor | — | Pitting; not recommended for brine | Cole-Parmer Chemical Compatibility |
Carbon steel metal | Poor | — | Rapid rust in brine | Cole-Parmer Chemical Compatibility |
FRP thermoplastic | Excellent | 60 | Common bulk-storage | Cole-Parmer Chemical Compatibility |
HDPE thermoplastic | Excellent | 60 | Universal salt brine compatibility. | Cole-Parmer Chemical Compatibility |
PP thermoplastic | Excellent | 80 | Acceptable for hot brine | Cole-Parmer Chemical Compatibility |
PVC thermoplastic | Excellent | 60 | Standard for brine piping. | Cole-Parmer Chemical Compatibility |
Ratings reflect the service envelope (concentration × temperature) shown. Always confirm against your specific duty cycle and contact-time before equipment selection. The most cautious rating across overlapping references is shown.
Materials Selection Tool
Showing 13 of 13 materials compatible at the selected envelope.
| Material | Rating | Max T (°C) | Notes |
|---|---|---|---|
Buna-N (NBR) elastomer | Good | 60 | Acceptable |
EPDM elastomer | Excellent | 100 | Standard for brine gaskets. |
Viton (FKM) elastomer | Excellent | 100 | Preferred elastomer |
Borosilicate Glass glass ceramic | Excellent | 100 | Universally inert to salt solutions. |
Concrete (sealed) glass ceramic | Good | — | Acceptable with epoxy coating |
304 stainless steel metal | Fair | 25 | Pitting in chloride-rich service |
316L Stainless Steel metal | Good | 60 | Watch for chloride pitting above 60 °C in chloride salts. |
Aluminium metal | Poor | — | Pitting; not recommended for brine |
Carbon steel metal | Poor | — | Rapid rust in brine |
FRP thermoplastic | Excellent | 60 | Common bulk-storage |
HDPE thermoplastic | Excellent | 60 | Universal salt brine compatibility. |
PP thermoplastic | Excellent | 80 | Acceptable for hot brine |
PVC thermoplastic | Excellent | 60 | Standard for brine piping. |
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
- Not regulatedAdjudicated
- H-Codes (Hazard Statements)
- —no canonical
- P-Codes (Precautionary Statements)
- —no canonical
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 Thiosulfate Technical Grade. Every file included is SHA-256 hashed and listed in a manifest your QA team can audit.
Applications
- Water treatmentpanchemcorp.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
- Stored and Kept Well in Dry Atmospherepanchemcorp.com
- Handling Precautions
- Standard chemical PPE — dust mask and goggles for handling of fine grades. Avoid generating airborne dust.Class-level guidance — not product-specific; the SDS controls.
- Incompatibilities
- Specific incompatibilities depend on the salt — consult the SDS. Many salts react with strong acids to release gases.Class-level guidance — not product-specific; the SDS controls.
- Shelf Life
- 24 monthspanchemcorp.comStored and kept well in dry atmosphere
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.
Revision History
Last reviewed 2026-06-17 by Andre Taki, DOT Hazmat Specialist.
| Version | Date | Change | Trigger |
|---|---|---|---|
| 1.1 | 2026-06-17 | Canonical data re-verified: 3 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.