Agent Name

Boron oxide

CAS Number

1303-86-2

Formula

B2-O3

Major Category

Metals

Synonyms

Boric acid (HBO2), anhydride; Boric anhydride; Boric oxide; Boric oxide (B2O3); Boron oxide (B2O3); Boron sesquioxide; Boron trioxide; Diboron trioxide; Fused boric acid; [ChemIDplus]

Category

Metalloid Compounds (Boron)

Description

Colorless, semitransparent lumps or hard, white, odorless crystals; [NIOSH]

Sources/Uses

Used to produce elemental boron, heat-resistant glass, fire-resistant paint, electronics, and herbicides; Derived by heating boric acid; [Hawley]

Comments

An eye and respiratory irritant; See "Boric acid." Boron is a "hepatotoxic agent." [Zimmerman, p. 4] A skin, eye, and respiratory tract irritant; [ICSC]

Reference Link

NIOSH Occupational Health Guidelines for Chemical Hazards: Boron oxide

Exposure Assessment
Skin Designation (ACGIH)

Insufficient data

TLV (ACGIH)

10 mg/m3

PEL (OSHA)

15 mg/m3, total dust

IDLH (NIOSH)

2000 mg/m3

Excerpts from Documentation for IDLHs

Rats exposed for 6 hours/day, 5 days/week for 10 weeks to a concentration of 470 mg/m3 showed no signs of intoxication other than mild nasal irritation [Wilding et al. 1959].

Half Life

Whole body (for boron administered orally): completely removed within 96 hours; [TDR, p. 205]

Reference Link

ATSDR - ToxFAQs - Boron

Adverse Effects
Hepatotoxin

Hepatotoxin, Secondary

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

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Biomedical References

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Related Information in HazMap
Processes

Industrial Processes with risk of exposure: