MSDS Potassium Hydroxide (KOH) – Safety Data Sheet & GHS Hazards

Summary MSDS for Potassium Hydroxide (KOH), CAS 1310-58-3: substance identity, GHS hazard classification, hazard and precautionary statements, and links to the manufacturer's official SDS.

Identity summary

Name	Potassium Hydroxide
Other names (IUPAC)	–
Molecular formula	KOH
CAS number	1310-58-3
Molar mass	56.106 g/mol
PubChem CID	14797

Molar mass of KOH and how to calculate it

The molar mass of KOH is 56.10 g/mol, the sum of the relative atomic masses of all atoms in the formula: 39.098 + 15.999 + 1.008 = 56.10 g/mol.

Element	Atoms	Atomic mass	Contribution	Mass %
K	1	39.098	39.10	69.69%
O	1	15.999	16.00	28.52%
H	1	1.008	1.01	1.80%

So 1 mol of KOH weighs 56.10 g, and 1 L of a 0.1 M solution needs 5.611 g of pure KOH. For liquid or concentrated reagents, work from assay and density with the dilution formula. Calculate other compounds with the molar mass calculator.

Hazard identification (GHS)

Signal word: DANGER

Pictograms:

Meaning of all GHS hazard symbols

Hazard statements (H)

• H301: Toxic if swallowed.
• H314: Causes severe skin burns and eye damage.
• H370: Causes damage to organs.
• H372: Causes damage to organs through prolonged or repeated exposure.
• H304: May be fatal if swallowed and enters airways.

Precautionary statements (P)

Prevention

• P260: Do not breathe dust.
• P270: Do not eat, drink or smoke when using this product.
• P264: Wash skin thoroughly after handling.
• P280: Wear protective gloves/ protective clothing/ eye protection/ face protection.

Response

• P308 + P311: IF exposed or concerned: Call a POISON CENTER/doctor.
• P303 + P361 + P353: IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water.
• P301 + P330 + P331: IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
• P363: Wash contaminated clothing before reuse.
• P301 + P310 + P330: IF SWALLOWED: Immediately call a POISON CENTER/doctor. Rinse mouth.
• P304 + P340 + P310: IF INHALED: Remove person to fresh air and keep comfortable for breathing. Immediately call a POISON CENTER/doctor.
• P305 + P351 + P338 + P310: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Immediately call a POISON CENTER/doctor.

Storage

• P405: Store locked up.

Disposal

• P501: Dispose of contents/ container to an approved waste disposal plant.

The GHS classification above matches TCI (Tokyo Chemical Industry) official data for product P2844 Potassium Hydroxide (Powder). Substance identity from PubChem CID 14797.

Download the official SDS & CoA

The applicable Safety Data Sheet is the manufacturer's SDS for the product and lot you purchase. For products available from AMI Scientific:

TCI P2844 – Potassium Hydroxide (Powder)	Official SDS & CoA (TCI)
TCI P2844 – Potassium Hydroxide (Powder)	View product
TCI P2849 – Potassium Hydroxide (Pellets)	Official SDS & CoA (TCI)View product
Potassium Hydroxide Pellets, CAS 1310-58-3, 1 kg – Smartlab A-2037	View product

SDS and lot-specific CoA are sent with the quotation/order or on request.

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What is an MSDS/SDS?

An MSDS (Material Safety Data Sheet), now called an SDS (Safety Data Sheet), is a 16-section document describing the hazards, handling, storage, first aid, and disposal of a chemical. Read the full MSDS guide and other MSDS pages.

This summary was compiled by AMI Scientific from TCI official GHS data for information purposes. Classification may differ by concentration, form, and supplier. Always refer to the manufacturer's official SDS for the product and lot you use. Updated: 06-11-2026.