Industrial chemicals · Taylor, TXTechnical Data Sheet
Potassium Hydroxide 45% Solution ACS Grade
ACS Reagent · 45%
- CAS number
- 1310-58-3
- UN number
- UN1814
- Hazard class · packing group
- 8 · PG II
- Structure
Structure · PubChem - Grade
- ACS Reagent · 45%
- Signal word
- Danger
- Hazards
- Proper shipping name
- Potassium hydroxide solution
Identity & Composition
- Product Name
- Potassium Hydroxide 45% Solution ACS Grade
- Alliance Code
- potassium-hydroxide-45-solution-acs-grade
- Grade
- ACS Reagent
- Concentration
- 45% w/w
- CAS Number
- 1310-58-3Adjudicated
- Formula
- HKOAdjudicated
- Molecular Weight
- 56.106Adjudicated
- Product Type
- Solution
Specifications
| Test | Specification | Typical | Method | Source |
|---|---|---|---|---|
| Assay (KOH) | 44.0 - 46.0 % w/w | 45.2 % | — | Interpreted |
| Chloride (Cl) | Max 0.005% | 0.00110% | — | Interpreted |
| Other Heavy Metals (as Ag) | Max 0.0005% | 0.000062% | — | Interpreted |
| Iron (Fe) | Max 0.0002% | 0.000014% | — | Interpreted |
| Phosphate (PO4) | Max 0.0002% | 0.000016% | — | Interpreted |
| Potassium Carbonate (K2CO3) | Max 0.2% | 0.068 % | — | Interpreted |
| Sodium (Na) | Max 0.25% | 0.068 % | — | Interpreted |
| Sulfate (SO4) | Max 0.001% | 0.00014% | — | Interpreted |
| Nitrogen compounds (as N) | Max 0.0005% | 0.000070% | Nessler colorimetric after Devarda reduction | Interpreted |
| Calcium (Ca) | Max 0.002% | 0.00020% | ICP-OES | Interpreted |
| Magnesium (Mg) | Max 0.001% | 0.000057% | ICP-OES | Interpreted |
| Nickel (Ni) | Max 0.0005% | 0.000009% | ICP-OES / AAS | 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.
Available GradesSame CAS, alternate grades and concentrations
| Grade | Concentration | Typical Assay | SKU | TDS |
|---|---|---|---|---|
| This grade ACS Reagent | 45% | — | current | current |
| Technical | 45% | — | potassium-hydroxide-45-solution-technical-grade-caustic-potash-liquid-koh | View TDS → |
| Technical | 30% | — | potassium-hydroxide-30-solution-technical-grade | View TDS → |
| Technical | 25% | — | potassium-hydroxide-25-solution-technical-grade-caustic-potash-liquid-koh | View TDS → |
Typical assay for each grade is the average of its recent lots. Confirm a grade meets your specification before substituting it.
Physical & Chemical Properties
| Property | Value | Source |
|---|---|---|
| Appearance | Clear, colorless liquid | Adjudicated |
| Odor | Odorless | Adjudicated |
| pH | 14 | Adjudicated |
| Specific Gravity | 1.452–1.462 at 20 °C (water = 1) | Adjudicated |
| Boiling Point | About 132–133 °C (270–271 °F) | Adjudicated |
| Melting Point | -33 to -29 °C (-27 to -20 °F), freezing point | Adjudicated |
| Flash Point | Not applicable | Adjudicated |
| Vapor Pressure | 6.4 mmHg at 25 °C | Adjudicated |
| Solubility (water) | Completely miscible with water (dilution releases heat) | Adjudicated |
Strong base — hygroscopic; values may drift in opened containers. See storage guidance.
Materials of Construction
| Material | Rating | Conditions | Source |
|---|---|---|---|
| HDPE | Compatible | 45% (w/w) KOH aqueous solution, ambient catalog storage; basis is the supplier packaging the 45% solution in an HDPE bottle | media.vwr.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
- UN1814Adjudicated
- Hazard Class
- 8Adjudicated
- Packing Group
- IIAdjudicated
- Proper Shipping Name
- Potassium hydroxide solutionAdjudicated
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 (potassium hydroxide, rat); estimated ATE of the 45% solution about 475–740 mg/kg (Acute Tox. 4, H302)Adjudicated
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 45% Solution ACS 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
- Store closed in steel, polyethylene or polypropylene, never aluminum or galvanized. Protect from freezing. 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
- Acids (violent reaction); aluminum, zinc, tin, copper, magnesium and their alloys, including galvanized metal (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)
UN1814, Potassium hydroxide solution, 8, PG II
Sourced from 49 CFR 172.101. Confirm against shipping documents and carrier requirements before tender.
Revision History
| Version | Date | Change | Trigger |
|---|---|---|---|
| 1.5 | 2026-10-08 | Canonical data updated: 20 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.4 | 2026-10-07 | Canonical data updated: 3 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.3 | 2026-09-30 | Canonical data updated: 3 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.2 | 2026-08-27 | Canonical data updated: 1 field changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.1 | 2026-08-11 | Canonical data updated: 12 fields changed via the provenance/adjudication pipeline.
| canonical_change |
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.