Safety data sheet for Potassium hydroxide
CAS 1310-58-3
This is the free preview of a draft SDS for Potassium hydroxide — Sections 1, 2 and 9, generated from the sources named below. The full 16-section draft, with your own company in Section 1, is $5 per document.
Typically documented by: Liquid soap making, industrial cleaning.
Draft safety data sheet — preview
Sections 1, 2, 9 of 16
- CAS number
- 1310-58-3
- Molecular formula
- KOH
- Molecular weight
- 56.106 g/mol
- Signal word
- Danger
Hazard classification
- GHS05 — Corrosive
- H290: May be corrosive to metals.
- H314: Causes severe skin burns and eye damage.
Section 1 — Identification
1.1 Product identifier
Product identifier: Potassium Hydroxide
Chemical name (IUPAC): potassium hydroxide
CAS number: 1310-58-3
PubChem CID reference: 14797
Synonyms: POTASSIUM HYDROXIDE; Caustic potash; Potash lye; Potassium hydrate; Hydroxyde de potassium; Potassa; Potasse caustique; Caustic-potash; Kali causticum; Caswell No. 693
Section 2 — Hazards Identification
2.1 Classification of the substance or mixture
Classification basis: OSHA 29 CFR 1910.1200 Appendix A, aligned to the GHS Rev. 7 hazard classes this sheet resolves: Met. Corr. 1, Skin Corr. 1A.
Classification: Corrosive to Metals, Category 1 (Met. Corr. 1) [H290]
Classification: Skin Corrosion, Category 1A (Skin Corr. 1A) [H314]
2.2 Label elements
Signal word: Danger
GHS pictograms: GHS05 (Corrosion)
Hazard statement: H290: May be corrosive to metals.
Hazard statement: H314: Causes severe skin burns and eye damage.
Precautionary statement: P234: Keep only in original packaging.
Precautionary statement: P390: Absorb spillage to prevent material damage.
Precautionary statement: P260: Do not breathe dust/fume/gas/mist/vapors/spray.
Precautionary statement: P264+P265: Wash hands thoroughly after handling. Do not touch eyes.
Precautionary statement: P280: Wear protective gloves, protective clothing, eye protection, face protection, and hearing protection.
Precautionary statement: P305+P354+P338: IF IN EYES: Immediately rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing.
Precautionary statement: P301+P330+P331: IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
Precautionary statement: P302+P361+P354: IF ON SKIN: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
Section 9 — Physical and Chemical Properties
9.1 Information on basic physical and chemical properties
Physical form: Solid
Appearance: White or colorless, orthorhombic, deliquescent pieces, lumps, or sticks having crystalline fracture
Odor: Odorless
Boiling point: 1320°C (2408°F) at 1013 hPa
Melting point: 406°C (763°F)
Density: 2 g/cm³
Vapor pressure: 1.3 hPa at 718.9°C
Water solubility: Solubility in water, 121 g/100 g water at 25 °C
pH: pH = 13.5 (0.1 Molar aq soln)
Not found in the public records searched: flash point, Log Pow (log Kow), vapor density, lower explosive limit, upper explosive limit, auto-ignition temperature and viscosity. Enter these from your supplier's safety data sheet or your own test report before the draft is issued.
Occupational exposure limits for Potassium hydroxide
The airborne limits on public record in the United States. These are transcribed from the tables named in each row, not derived. The full draft puts them in Section 8 with the control and PPE guidance.
A ceiling limit must not be exceeded at any moment. It is not an average, so a short excursion above it is not offset by a lower reading later in the shift.
NIOSH REL — Ceiling
2 mg/m³
NIOSH Pocket Guide to Chemical Hazards
Where each value came from
- Odor — Hazardous Substances Data Bank (HSDB)
- NIOSH. NIOSH Pocket Guide to Chemical Hazards. Department of Health & Human Services, Centers for Disease Control & Prevention. National Institute for Occupational Safety & Health. DHHS (NIOSH) Publication No. 2010-168 (2010). Available from: https://www.cdc.gov/niosh/npg
- View the record
- Melting point — Hazardous Substances Data Bank (HSDB)
- Haynes, W.M. (ed.). CRC Handbook of Chemistry and Physics. 95th Edition. CRC Press LLC, Boca Raton, FL: 2014-2015, p. 4-82
- View the record
- Density — Hazardous Substances Data Bank (HSDB)
- Same reference as melting point above.
- View the record
- Water solubility — Hazardous Substances Data Bank (HSDB)
- Same reference as melting point above.
- View the record
- pH — Hazardous Substances Data Bank (HSDB)
- O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Cambridge, UK: Royal Society of Chemistry, 2013, p. 1420
- View the record
A value with no row here was assembled from more than one record, so no single record is credited for it. The draft you buy carries this table as an appendix covering all 16 sections.
Sources
- ECHA C&L Inventory — harmonised CLP entry
- Hazardous Substances Data Bank (HSDB)
- NIOSH Pocket Guide to Chemical Hazards
- PubChem — GHS classification
- PubChem — compound record
- PubChem — names and identifiers
- PubChem — regulatory information
- PubChem — toxicity data
- PubChem — transport information
Sections 1.3 and 1.4 are withheld here because the supplier and emergency contact blocks carry your own company details in the draft you buy. Every draft needs review by a competent person before it is issued.
Measured values for Potassium hydroxide, and where each one comes from
26 measured values for 8 properties, read from 4 public databases. On 4 properties the records differ. Each reading is shown with its own record. Follow any record to read the value at its source.
Boiling point
4 records, 1320 to 1327 °C
Used with vapour pressure to judge how readily the substance reaches the air you breathe.
- 2415 °F
- NIOSH Pocket Guide
- 1327 °C @760 [mm Hg]
- PAC Chemical Database, U.S. Department of Energy
Melting point
6 records, 250 to 406 °C
Fixes the physical state at handling temperature, which the label and the transport class depend on.
- about 360 °C; about 380 °C when anhydrous
- Hazardous Substances Data Bank (HSDB)
- Melting point: 406 °C
- Hazardous Substances Data Bank (HSDB)
- 90-92% KOH; MP: about 250 °C; heat of fusion: about 6.7 kJ/mol /Technical potassium hydroxide/
- Hazardous Substances Data Bank (HSDB)
- 716 °F
- NIOSH Pocket Guide
Vapour pressure
3 records differ
The higher it is, the faster the substance evaporates into the workplace air at room temperature.
- 1 MM HG @ 714 °C
- Hazardous Substances Data Bank (HSDB)
- (1317 °F): 1 mmHg
- NIOSH Pocket Guide
- 1 mmHg at 1326 °F; 5 mmHg at 1497 °F
- OSHA Occupational Chemical Database
Density
4 records differ
Needed to convert between mass and volume on the label, in transport papers and in a spill estimate.
- 2.044 g/cu cm
- Hazardous Substances Data Bank (HSDB)
- 2.044 @25 °C
- PAC Chemical Database, U.S. Department of Energy
Solubility
6 records, each a different case
Determines spill behaviour, the right extinguishing media and the correct first-aid rinse.
- Solubility in water, 121 g/100 g water at 25 °C
- Hazardous Substances Data Bank (HSDB)
- Solubility in water (g KOH/100 g H2O): 97 at 0 °C; 103 at 10 °C; 112 at 20 °C; 126 at 30 °C; 178 at 100 °C
- Hazardous Substances Data Bank (HSDB)
- Soluble in 0.9 part water, about 0.6 part boiling water
- Hazardous Substances Data Bank (HSDB)
- Soluble in ethanol, methanol
- Hazardous Substances Data Bank (HSDB)
- For more Solubility (Complete) data for POTASSIUM HYDROXIDE (6 total), please visit the HSDB record page
- Hazardous Substances Data Bank (HSDB)
- (59 °F): 107%
- NIOSH Pocket Guide
pH
1 record
Drives the skin and eye corrosion classification for solutions, alongside the corrosivity data.
- pH = 13.5 (0.1 Molar aq soln)
- Hazardous Substances Data Bank (HSDB)
Odour
1 record
Odour is a warning property only. Many substances are hazardous well below the concentration you can smell.
Decomposition temperature
1 record
The temperature at which the substance breaks down, often into products more hazardous than itself.
- When heated to decomposition it emits toxic fumes of K2O
- Hazardous Substances Data Bank (HSDB)
These are the public records read for Potassium hydroxide, published here unchanged. Where two records disagree, the draft you buy states the value and names the record behind it, so a reviewer can see what was chosen. Every draft needs review by a competent person before it is issued.
Get the full draft SDS for Potassium hydroxide
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