Boric anhydride
Boron trioxide
Boron sesquioxide
B2O3
Molecular mass: 69.6
ICSC # 0836
CAS # 1303-86-2
RTECS # ED7900000
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Not combustible.
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In case of fire in the surroundings: all extinguishing agents allowed.
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Explosion
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Exposure
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PREVENT DISPERSION OF DUST!
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•Inhalation
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Cough.
Sore throat.
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Local exhaust or breathing protection.
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Fresh air, rest.
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•Skin
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Redness.
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Protective gloves.
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Remove contaminated clothes.
Rinse and then wash skin with water and soap.
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•Eyes
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Redness.
Pain.
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Safety spectacles.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Abdominal pain.
Diarrhoea.
Nausea.
Vomiting.
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Do not eat, drink, or smoke during work.
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Rinse mouth.
Refer for medical attention.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting.
Carefully collect remainder,
then remove to safe place.
(Extra personal protection: P1 filter respirator for inert particles).
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Dry.
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Important Data
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Physical State; Appearance:
COLOURLESS, ODOURLESS, HYGROSCOPIC, BRITTLE, VITREOUS LUMPS OR HARD WHITE CRYSTALS
, WITH SLIGHTLY BITTER TASTE.
Physical Dangers:
Chemical Dangers:
Reacts slowly with water to form boric acid.
Attacks metal in the presence of moist air.
Occupational Exposure Limits:
TLV (as TWA): 10 mg/m3 (ACGIH 1995-1996).
MAK: IIb (not established but data is available) (DFG 2007).
OSHA PEL: TWA 15 mg/m3
NIOSH REL: TWA 10 mg/m3
NIOSH IDLH: 2000 mg/m3 See: 1303862
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Routes of Exposure:
The substance can be absorbed into the body
by inhalation of its aerosol and
by ingestion.
Inhalation Risk:
Evaporation at 20°C is negligible; a nuisance-causing concentration of airborne particles can, however, be reached quickly when dispersed.
Effects of Short-Term Exposure:
The substance
irritates
the eyes,
the skin and
the respiratory tract.
Effects of Long-Term or Repeated Exposure:
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Physical
Properties
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Boiling point: about 1860°C
Melting point: about 450°C
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Relative density (water = 1): 2.46 (cryst); 1.8 (amorph)
Solubility in water: moderate
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Environmental
Data
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N O T E S
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Also consult
ICSC # 0991 (Boric acid).
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ADDITIONAL INFORMATION
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ICSC: 0836
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BORON OXIDE
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(C) IPCS, CEC, 1994
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IMPORTANT LEGAL NOTICE:
Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH,
the CEC or the IPCS is responsible for the use which might be made of this
information. This card contains the collective views of the IPCS Peer Review Committee and may
not reflect in all cases all the detailed requirements included in national legislation
on the subject. The user should verify compliance of the cards with the relevant legislation
in the country of use.
The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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