| Agent Name |
Boron oxide |
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| CAS Number |
1303-86-2 |
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| Formula |
B2-O3 |
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| Major Category |
Metals |
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| 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] |
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| Category |
Metalloids and Compounds |
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| Description |
Colorless, semitransparent lumps or hard, white, odorless crystals; [NIOSH] |
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| Sources/Uses |
Used to produce elemental boron, heat-resistant glass, fire-resistant paint, electronics, and herbicides; Derived by heating boric acid; [Hawley] |
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| 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] |
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| Exposure Assessment |
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| Skin Designation (ACGIH) |
No |
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| TLV (ACGIH) |
10 mg/m3 |
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| PEL (OSHA) |
15 mg/m3, total dust |
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| IDLH (NIOSH) |
2000 mg/m3 |
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| 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]. |
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| Half Life |
Whole body (for boron administered orally): completely removed within 96 hours; [TDR, p. 205] |
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| Reference Link |
ATSDR ToxFAQs - Boron |
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| Adverse Effects |
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| Hepatotoxin |
Hepatotoxin, Secondary |
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| Links to Other NLM Databases |
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| Health Studies |
Human Health Effects from Hazardous Substances Data Bank: BORON OXIDE
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