Sodium biborate
Sodium pyroborate
Boron sodium oxide
Fused borax
Na2B4O7
Molecular mass: 201.3
ICSC # 1229
CAS # 1330-43-4
RTECS # ED4588000
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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.
Gives off irritating or toxic fumes (or gases) in a fire.
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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.
Shortness of breath.
Sore throat.
Nose bleed.
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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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Dry skin.
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.
Weakness.
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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.
Carefully collect remainder,
then remove to safe place.
(Extra personal protection: P2 filter respirator for harmful particles).
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Separated from
strong oxidants.
Dry.
Well closed.
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Important Data
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Physical State; Appearance:
ODOURLESS,
HYGROSCOPIC, WHITE POWDER
OR GLASS-LIKE PLATE.
TURNS OPAQUE ON Exposure TO AIR.
Physical Dangers:
Chemical Dangers:
The substance decomposes
on heating or
on burning
producing toxic fumes including sodium oxide.
Reacts with strong oxidants.
Occupational Exposure Limits:
TLV: (borates) 2 mg/m3 as TWA, 6 mg/m3 as STEL; A4 (not classifiable as a human carcinogen); (ACGIH 2008).
OSHA PEL: none
NIOSH REL: TWA 1 mg/m3
NIOSH IDLH: N.D. See: IDLH INDEX
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Routes of Exposure:
The substance can be absorbed into the body
by inhalation of its aerosol,
by ingestion and
through damaged skin.
Inhalation Risk:
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed, especially if powdered.
Effects of Short-Term Exposure:
The substance
irritates the eyes, the skin and the respiratory tract.
The substance may cause effects on the central nervous system, kidneys and gastrointestinal tract by ingestion at high dose or through damaged skin.
Effects of Long-Term or Repeated Exposure:
Repeated or prolonged contact with skin may cause dermatitis.
The substance may have effects on the respiratory tract.
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Physical
Properties
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Boiling point (decomposes): 1575°C
Melting point: 741°C
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Relative density (water = 1): 2.367
Solubility in water, g/100 ml at 20°C: 2.56
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Environmental
Data
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N O T E S
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Rasorite 65 is a trade name.
Card has been partially updated in February 2009: see Occupational Exposure Limits.
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ADDITIONAL INFORMATION
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ICSC: 1229
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SODIUM TETRABORATE
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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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