Industrial chemicals · Taylor, TXTechnical Data Sheet
Technical Data Sheet
Sodium Dichromate Technical Grade
- CAS number
- 7789-12-0
- UN number
- UN3288
- Hazard class · packing group
- 6.1 · PG III
- Structure
Structure · PubChem - Signal word
- Danger
- Hazards
- Proper shipping name
- Toxic solid, inorganic, n.o.s. (Sodium dichromate dihydrate)
Last reviewed 2026-06-29 by Andre Taki, Chief Commercial Officer.
Identity & Composition
- Product Name
- Sodium Dichromate Technical Grade
- Alliance Code
- sodium-dichromate-dihydrate
- Grade
- —
- Concentration
- —
- CAS Number
- 7789-12-0Adjudicated
- Formula
- Cr2H4Na2O9Adjudicated
- Molecular Weight
- 298.00PubChem
- Product Type
- Pure substance
Specifications
| Test | Specification | Typical | Method | Source |
|---|---|---|---|---|
| Assay (as Na2Cr2O7·2H2O) | 99.0% mass min | 99.7% mass | — | Interpreted |
| Chloride (as Cl) | 0.05% mass max | 0.0035% mass | — | Interpreted |
| Insoluble matter | 0.2 % by Weight maximum | 0.013 % by Weight | Methods and procedures described in "Reagent Chemicals", American Chemical Society (ACS) Specifications | Interpreted |
| Iron (as Fe) | 30 ppm max | 4.3 ppm | — | Interpreted |
| Sulphate (as SO4) | 0.2% mass max | 0.051% mass | — | Interpreted |
| Free moisture (surface water) | 0.5% mass max | 0.15% mass | Gravimetric loss on drying, 2 h @ 60 C | 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.
Physical & Chemical Properties
| Property | Value | Source |
|---|---|---|
| Appearance | Orange-red crystalline | Adjudicated |
| Form | Solid | Published reference |
| pH | 3.5–4.5 | Interpreted |
| Specific Gravity | 2.35 | Interpreted |
| Boiling Point | Decomposes at 400 °C (752 °F) before boiling | Adjudicated |
| Melting Point | 357 °C (675 °F) | Adjudicated |
| Flash Point | Not applicable | Published reference |
| Solubility (water) | High water solubility, moderate organic solvent solubility | Published reference |
Materials of Construction
| Material | Rating | Conditions | Source |
|---|---|---|---|
| HDPE | Compatible | neat technical grade dihydrate solid, assay 99.0% mass min; supplied packed in 50 kg HDPE drums | supremepetrochemicals.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
- UN3288Adjudicated
- Hazard Class
- 6.1Adjudicated
- Packing Group
- IIIAdjudicated
- Proper Shipping Name
- Toxic solid, inorganic, n.o.s. (Sodium dichromate dihydrate)Adjudicated
GHS / OSHA HCS 2024
- Signal Word
- DangerAdjudicated
- H-Codes (Hazard Statements)
- H272, H301, H312, H314, H317, H330, H334, H340, H350, H360FD, H372, H400, H410Adjudicated
- P-Codes (Precautionary Statements)
- P201, P202, P210, P220, P221, P260, P261, P264, P270, P271, P272, P273, P280, P284, P285, P301+P310, P302+P352, P303+P361+P353, P304+P340, P304+P341, P305+P351+P338, P308+P313, P310, P314, P320, P321, P330, P333+P313, P342+P311, P362, P370+P378, P391, P403+P233, P405, P501Adjudicated
Occupational Exposure Limits
- OSHA PEL (29 CFR 1910.1000)
- 0.005 mg/m³ TWA (as Cr(VI)); action level 0.0025 mg/m³ — 29 CFR 1910.1026Adjudicated
- ACGIH TLV
- 0.0002 mg/m³ TWA; 0.0005 mg/m³ STEL (inhalable, as Cr(VI))Adjudicated
- NIOSH REL
- Ca — 0.0002 mg/m³ TWA (as Cr(VI))Adjudicated
- NIOSH IDLH
- 15 mg/m³ (as Cr(VI))Adjudicated
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 Dichromate Technical Grade. Every file included is SHA-256 hashed and listed in a manifest your QA team can audit.
Applications
- Industrial manufacturingmubychem.com
- Used as a strong oxidizing agent (dichromate salt), supplied as the dihydrate Na2Cr2O7·2H2Omubychem.com
- Detergent manufacturingsupremepetrochemicals.com
- Water treatmentsupremepetrochemicals.com
- Construction additivessupremepetrochemicals.com
- Textile auxiliariessupremepetrochemicals.com
- Paper manufacturingsupremepetrochemicals.com
- Surface coatingsupremepetrochemicals.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
- Store in tightly closed containers in a cool, dry, well-ventilated area, locked up, away from combustible and organic materials and reducing agents. Handle only in a fume hood; minimize dust.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
- Reducing agents; combustible and organic materials (paper, wood, oils); acids; hydrazine, hydroxylamine and other strong reducers (violent reaction).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)
UN3288, Toxic solid, inorganic, n.o.s. (Sodium dichromate dihydrate), 6.1, PG III
Sourced from 49 CFR 172.101. Confirm against shipping documents and carrier requirements before tender.
NMFC Class
70
Placard
Toxic
Packing Group
PG III
Revision History
Last reviewed 2026-06-29 by Andre Taki, Chief Commercial Officer, DOT Hazmat–certified (49 CFR 172.704).
| Version | Date | Change | Trigger |
|---|---|---|---|
| 1.9 | 2026-10-13 | Canonical data updated: 4 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.8 | 2026-10-08 | Canonical data updated: 3 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.7 | 2026-09-30 | Canonical data updated: 1 field changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.6 | 2026-09-28 | Canonical data updated: 12 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.5 | 2026-09-21 | Canonical data updated: 1 field changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.4 | 2026-07-23 | Canonical data updated: 1 field changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.3 | 2026-07-22 | Canonical data updated: 1 field changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.2 | 2026-07-21 | Canonical data updated: 1 field changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.1 | 2026-06-29 | Canonical data re-verified: 11 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.