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Boric Acid

Posted Date:2016/6/14

Basic information

CAS number of boric acid is 10043-35-3/11113-50-1.

Boric acid is a kind of white powder crystal or a kind of scalelike crystal with three oblique planes. It is with a satiny feel and without smell. It is soluble in water, alcohol, glycerin, ethers and essential oil. The aqueous solution is a weak acid.

Boric acid, also called hydrogen borate, boracic acid, orthoboric acid and acidum boricum, is a weak, monobasic Lewis acid of boron often used as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor to other chemical compounds.

Main application

Boric acid can be used as additive and cosolvent in boron steel producing to make the boron steel have a high hardness and good ductility. It can prevent surface oxidation when the metal welding, and brazing. It is also a boron steel alloy material.

In electroplating, boric acid is used as part of some proprietary formulas. It is widely used in rare metal smelting, electrolytic capacitor, painting, foundry casting, textile industry, wood industry and so on.

The primary industrial use of boric acid is in the manufacture of monofilament fiberglass usually referred to as textile fiberglass. Textile fiberglass is used to reinforce plastics in applications that range from boats, to industrial piping to computer circuit boards.

In the jewelry industry, boric acid is often used in combination with denatured alcohol to reduce surface oxidation and firescale from forming on metals during annealing and soldering operations.

Boric acid is used in the production of the glass in LCD flat panel displays.

It is also used in the manufacturing of ramming mass, a fine silica-containing powder used for producing induction furnace linings and ceramics.

Boric acid is added to borax for use as welding flux by blacksmiths.

Boric acid was first registered in the US as an insecticide in 1948 for control of cockroaches, termites, fire ants, fleas, silverfish, and many other insects. The product is generally considered to be safe to use in household kitchens to control cockroaches and ants. It acts as a stomach poison affecting the insects' metabolism, and the dry powder is abrasive to the insects' exoskeletons.

Main Hazard

Health Hazard:

Based on mammalian median lethal dose (LD50) rating of 2,660 mg/kg body mass, boric acid is only poisonous if taken internally or inhaled in large quantities.

Long term exposure to boric acid may be of more concern, causing kidney damage and eventually kidney failure (see links below).

Hazardous Nature: it is non-combustible but irritating.

Hazardous characteristics: release toxic gas by heating

The GHS classification in some countries

Classification in China

Hazard classification

Hazard statement code

Reproductive toxicity,Category 1

May damage fertility. May damage the unborn child.

Classification per Japan NITE Chemical Risk Information Platform

Hazard classification

Hazard statement code

Skin corrosion/irritation

Category 2

H315:Causes skin irritation

Serious eye damage/eye irritation

Category 2

H319: Causes serious eye irritation

Reproductive toxicity

Category 1B

H360: May damage fertility or the unborn child

Specific target organ toxicity, single exposure

Category 1B

H370: Causes damage to organs

Specific target organ toxicity, single

exposure; Respiratory tract irritation

Category 3

H335: May cause respiratory irritation

Classification per CLP

Hazard classification

Hazard statement code

Reproductive toxicity,Category 1


H360: May damage fertility. May damage the unborn child. (C = 5.5 %)


Note: the hazard classification requirement of specific product should be complied with the local supervision laws and regulations of the importer.