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| Boron oxide | CAS 1303-86-2 | ||
| B2O3 | RTECS ED7900000 | ||
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Synonyms & Trade Names Boric anhydride, Boric oxide, Boron trioxide |
DOT ID & Guide |
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Exposure Limits |
NIOSH REL: TWA 10 mg/m3 | ||
| OSHA PEL†: TWA 15 mg/m3 | |||
| IDLH 2000 mg/m3 See: 1303862 | Conversion | ||
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Physical Description Colorless, semitransparent lumps or hard, white, odorless crystals. |
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MW: 69.6 |
BP: 3380°F |
MLT: 842°F |
Sol: 3% |
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VP: 0 mmHg (approx) |
IP: 13.50 eV |
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Sp.Gr: 2.46 |
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Fl.P: NA |
UEL: NA |
LEL: NA |
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| Noncombustible Solid | |||
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Incompatibilities & Reactivities Water [Note: Reacts slowly with water to form boric acid.] |
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Measurement Methods NIOSH 0500 See: NMAM or OSHA Methods |
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Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: No recommendation |
First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush promptly Breathing: Fresh air Swallow: Medical attention immediately |
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Important additional information about respirator selection Respirator Recommendations NIOSH Up to 50 mg/m3: (APF = 5) Any dust and mist respirator* Up to 100 mg/m3: (APF = 10) Any dust and mist respirator except single-use and quarter-mask respirators^*/(APF = 10) Any supplied-air respirator* Up to 250 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode*/(APF = 25) Any powered, air-purifying respirator with a dust and mist filter^* Up to 500 mg/m3: (APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/(APF = 50) Any powered, air-purifying respirator with a tight-fitting facepiece and a high-efficiency particulate filter*/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Up to 2000 mg/m3: (APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode Emergency or planned entry into unknown concentrations or IDLH conditions: (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode/(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus Escape: (APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus |
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| Exposure Routes inhalation, ingestion, skin and/or eye contact | |
| Symptoms Irritation eyes, skin, respiratory system; cough; conjunctivitis; skin erythema (skin redness) | |
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Target Organs
Eyes, skin, respiratory system |
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| See also: INTRODUCTION See ICSC CARD: 0836 |