Caustic Soda

Product summary

A representative alkaline product manufactured through the electrolysis of sodium chloride solution


Strong alkaline product with acute toxicity and corrosivity.
It is a “hazardous substance” under the Poisonous and Deleterious Substances Control Law of Japan. (Refer to SDS regarding applicable laws and regulations)

Generic name: sodium hydroxide
Chemical formula: NaOH

(Reaction) NaCl + H2O > NaOH Caustic soda + 1/2H2 Hydrogen + 1/2Cl2 Chlorine

CSCL Number 1-410
Industrial Safety and Health Act Number 1-410
CAS NO 1310-73-2

Main uses

Used in a wide variety of products like chemical fibers, paper, pulp, chemical products, food industry, soap.


Granulated caustic soda comes in 25kg plastic bags.
Please consult with us for other packaging options.
Other liquid products are delivered by chemical tank truck.
Please select to match your intended use.

Physical Properties

Caustic soda (liquid)Caustic soda (solid)
Appearance Changing condition of concentration and
temperature may solidify from liquid state.
Solid (granular)
Color Colorlessness or gray White and translucent
Odor Cdorless No data available
Boiling point138° (48%-liquid)1,390°C
Melting point No data available318°C
Density1.50 (48%-liquid) g/cm32.13g/cm3

Warnings for use

Is corrosive to eyes and skin, so always wear protective gear such as protective goggles, rubber gloves, and rubber boots.
It produces heat if diluting or neutralizing acid, so please add a small amount of sodium hydroxide liquid while stirring.
Never add water or acid into a concentrated solution of sodium hydroxide, because there is a danger of causing an explosive boil.

Production plant

■ AGC Inc. (Japan)

Chiba Plant
Kashima Plant

Anyer Plant

Phrapradaeng Plant
Rayong Plant


Phase diagram (taken from a graph of solidifying temperature per concentration)
*Please refer to the SDS for more detailed product information.

Inquiries (Japan)