Industrial chemicals · Taylor, TXTechnical Data Sheet
Technical Data Sheet
Potassium Hydroxide (KOH) Technical Grade
Technical · 90.3%
- CAS number
- 1310-58-3
- UN number
- UN1813
- Hazard class · packing group
- 8 · PG II
- Structure
Structure · PubChem - Grade
- Technical · 90.3%
- Signal word
- Danger
- Hazards
- Proper shipping name
- Potassium Hydroxide, solid
Last reviewed 2026-06-18 by Andre Taki, Chief Commercial Officer.
Identity & Composition
- Product Name
- Potassium Hydroxide (KOH) Technical Grade
- Alliance Code
- potassium-hydroxide-flakes-koh
- Grade
- Technical
- Concentration
- 90.3%
- CAS Number
- 1310-58-3PubChem
- Formula
- —PubChem
- Molecular Weight
- —PubChem
- Product Type
- Pure substance
Specifications
| Test | Specification | Typical | Method | Source |
|---|---|---|---|---|
| Hydroxide alkalinity as KOH (wt. %) | 90 min | 91.0 wt % | — | Interpreted |
| Arsenic (As) | 0.0003 % | 0.000011 % | — | Interpreted |
| Potassium chloride as KCl (ppm by wt.) | 150 max | 39 ppm | — | Interpreted |
| Heavy metals (as Pb) | ≤0.002% | 0.00009 % | — | Interpreted |
| Iron as Fe (ppm by wt.) | 3 max | 1.1 ppm | — | Interpreted |
| Lead (Pb) | 0.005 % | 0.000011 % | — | Interpreted |
| Nickel as Ni (ppm by wt.) | 4 max | 1.4 ppm | — | Interpreted |
| Potassium Carbonate (K2CO3) | ≤1.0% | 0.40 % | — | Interpreted |
| Sulfate (SO4) | 0.05% | 0.00044 % | — | Interpreted |
| Insoluble matter in H2O | 0.05 % | 0.0009 % | — | Interpreted |
| Sodium (as Na) | 0.5% Max. | 0.30 % | Flame AAS / ICP-OES | 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 | White crystalline powder | Adjudicated |
| Form | Solid | Published reference |
| Odor | Odorless | Adjudicated |
| pH | 13.5–14 (0.1 M to 10% solution) | Adjudicated |
| Specific Gravity | 2.04 (water = 1) | Adjudicated |
| Density | 1.45 to 1.50 at 68 °F (USCG, 1999) | Published reference |
| Boiling Point | 1,320–1,327 °C (2,408–2,421 °F) | Adjudicated |
| Melting Point | 360–406 °C (680–763 °F), depending on water content | Adjudicated |
| Flash Point | Not applicable | Adjudicated |
| Vapor Pressure | Negligible at 20 °C (1 mmHg at 719 °C) | Adjudicated |
| Solubility (water) | Very soluble in water, about 1,120–1,210 g/L at 20–25 °C (strongly exothermic); soluble in alcohol and glycerin | Adjudicated |
Strong base — hygroscopic; values may drift in opened containers. See storage guidance.
Materials of ConstructionService envelope ≈ 90.3%
| Material | Rating | Max T (°C) | Notes | Source |
|---|---|---|---|---|
Buna-N (NBR) elastomer | Fair | 40 | Limited service life | Cole-Parmer Chemical Compatibility |
EPDM elastomer | Excellent | 90 | Preferred elastomer | Cole-Parmer Chemical Compatibility |
Viton (FKM) elastomer | Poor | — | Not recommended above 25% | Cole-Parmer Chemical Compatibility |
PTFE fluoropolymer | Excellent | 200 | Universal compatibility. | Cole-Parmer Chemical Compatibility |
304 stainless steel metal | Good | 80 | Acceptable for dilute caustic | Cole-Parmer Chemical Compatibility |
316 stainless steel metal | Excellent | 95 | Standard caustic service | Cole-Parmer Chemical Compatibility |
Aluminium metal | Not recommended | — | Rapid attack; generates hydrogen | Cole-Parmer Chemical Compatibility |
Carbon steel metal | Good | 50 | Acceptable to 50 °C; caustic embrittlement above | Cole-Parmer Chemical Compatibility |
Nickel metal | Excellent | 100 | Preferred for high-temperature caustic | Cole-Parmer Chemical Compatibility |
Zinc / galvanized steel metal | Not recommended | — | Rapid corrosion | Cole-Parmer Chemical Compatibility |
HDPE thermoplastic | Excellent | 60 | Standard drum / IBC material | Cole-Parmer Chemical Compatibility |
PP thermoplastic | Excellent | 80 | Preferred for elevated temperature | Cole-Parmer Chemical Compatibility |
PVC thermoplastic | Good | 40 | Acceptable for ambient service | 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 material ratings within the selected envelope.
| Material | Rating | Max T (°C) | Notes |
|---|---|---|---|
Buna-N (NBR) elastomer | Fair | 40 | Limited service life |
EPDM elastomer | Excellent | 90 | Preferred elastomer |
Viton (FKM) elastomer | Poor | — | Not recommended above 25% |
PTFE fluoropolymer | Excellent | 200 | Universal compatibility. |
304 stainless steel metal | Good | 80 | Acceptable for dilute caustic |
316 stainless steel metal | Excellent | 95 | Standard caustic service |
Aluminium metal | Not recommended | — | Rapid attack; generates hydrogen |
Carbon steel metal | Good | 50 | Acceptable to 50 °C; caustic embrittlement above |
Nickel metal | Excellent | 100 | Preferred for high-temperature caustic |
Zinc / galvanized steel metal | Not recommended | — | Rapid corrosion |
HDPE thermoplastic | Excellent | 60 | Standard drum / IBC material |
PP thermoplastic | Excellent | 80 | Preferred for elevated temperature |
PVC thermoplastic | Good | 40 | Acceptable for ambient service |
Regulatory & Transport
DOT / 49 CFR
- UN Number
- UN181349 CFR 172.101
- Hazard Class
- 8Adjudicated
- Packing Group
- IIAdjudicated
- Proper Shipping Name
- Potassium Hydroxide, solidAdjudicated
GHS / OSHA HCS 2024
- Signal Word
- DangerAdjudicated
- H-Codes (Hazard Statements)
- H290, H302, H314Adjudicated
- P-Codes (Precautionary Statements)
- P234, P260, P264, P270, P280, P301+P312+P330, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P390, P405, P406, P501Adjudicated
Occupational Exposure Limits
- OSHA PEL (29 CFR 1910.1000)
- —no canonical
- ACGIH TLV
- 2 mg/m³ CeilingAdjudicated
- NIOSH REL
- 2 mg/m³ CeilingAdjudicated
- 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)
- 214–333 mg/kg (rat), the basis for H302Adjudicated
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 Potassium Hydroxide (KOH) Technical Grade. Every file included is SHA-256 hashed and listed in a manifest your QA team can audit.
Applications
- Industrial uses of potassium hydroxide: detergents/soaps, dyeing and bleaching, paint and varnish removers, electroplating, photo engraving, lithography, alkaline batteries, analytical chemistry, fuel and gas, thickening agent, organic synthesis, stabilizercorecheminc.com
- Used in a large number of manufacturing processesstore.astm.org
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 dry place — the flakes absorb moisture and carbon dioxide from air. Use steel, polyethylene or polypropylene containers, never aluminum or galvanized metal. Keep away from acids.Adjudicated
- Handling Precautions
- Use full PPE including chemical splash goggles and alkali-resistant gloves. Add base to water slowly with stirring. Highly exothermic dilution.Class-level guidance — not product-specific; the SDS controls.
- Incompatibilities
- Water in quantity (violent heat release); acids (violent reaction); aluminum, zinc, tin, copper, magnesium and their alloys (release flammable hydrogen); nitro compounds; organic materials; halogenated compounds.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)
UN1813, Potassium Hydroxide, solid, 8, PG II
Sourced from 49 CFR 172.101. Confirm against shipping documents and carrier requirements before tender.
NMFC Class
60
Placard
Corrosive
Packing Group
PG II
Revision History
Last reviewed 2026-06-18 by Andre Taki, Chief Commercial Officer, DOT Hazmat–certified (49 CFR 172.704).
| Version | Date | Change | Trigger |
|---|---|---|---|
| 1.6 | 2026-10-08 | Canonical data updated: 20 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.5 | 2026-10-07 | Canonical data updated: 3 fields 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: 1 field 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 | 2026-06-18 | 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.