Agent Name

Sodium borate, anhydrous

CAS Number

1330-43-4

Formula

B4-O7.2Na

Major Category

Metals

Synonyms

Anhydrous borax; Borax dehydrated; Disodium salt of boric acid; Disodium tetrabromate; Fused borax; Sodium borate (anhydrous); Sodium tetraborate; [NIOSH]

Category

Borate Compounds, Inorganic

Description

White to gray, odorless powder; Becomes opaque on exposure to air; [NIOSH]

Sources/Uses

Used as tablets or powder to kill larvae in livestock confinements and crawling insects in residences; [EPA Pesticides] Used as a fluxing agent, a buffering agent, a biocide (preservative, antiseptic, insecticide, fungicide, herbicide, algicide, nematocide), a fireproofing agent, a corrosion inhibitor, a tanning agent, and a textile bleaching agent; Used to manufacture glazes, enamels, borosilicate glass, fertilizers, detergents, antifreeze, pharmaceuticals, and cosmetics; [HSDB]

Comments

The basis for the TLV for inorganic borate compounds is irritation of the nose and respiratory tract. Studies of workers exposed to sodium borate dusts found no evidence of pulmonary function or reproductive impairment. [ACGIH] Borate dust is moderately irritating to the skin, but it is not absorbed well by intact skin. Inhalation of borate dust can cause nasal irritation, cough, and chest tightness. [EPA Pesticides] In high-dose reproductive studies of animals, boric acid causes testicular damage and fetal loss. [Frazier, p. 252-3]

Exposure Assessment
Skin Designation (ACGIH)

Insufficient data

TLV (ACGIH)

2 mg/m3, inhalable fraction

STEL (ACGIH)

6 mg/m3

MAK

0.75 mg/m3

Explanatory Notes

TLV is for "Borate compounds, inorganic" for "all forms of sodium borate and boric acid." [ACGIH]

Adverse Effects
Reproductive Toxin

Yes

ACGIH Carcinogen

Not Classifiable

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

Chemical Information

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Biomedical References

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Related Information in HazMap
Processes

Industrial Processes with risk of exposure: