Phosphoric acid
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CAS
7664-38-2
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H3PO4
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RTECS
TB6300000
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Synonyms & Trade Names
Orthophosphoric acid, Phosphoric acid (aqueous), White phosphoric acid
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DOT ID & Guide
1805 / 154 (liquid or solution)
3453 / 154 (solid)
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Exposure
Limits
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NIOSH REL: TWA 1 mg/m3 ST 3 mg/m3
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OSHA PEL†: TWA 1 mg/m3
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IDLH
1000 mg/m3
See: 7664382
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Conversion
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Physical Description
Thick, colorless, odorless, crystalline solid. [Note: Often used in an aqueous solution.]
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MW: 98.0
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BP: 415°F
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MLT: 108°F
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Sol: Miscible
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VP: 0.03 mmHg
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IP: ?
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Sp.Gr(77°F): 1.87 (pure) 1.33 (50% solution)
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Fl.P: NA
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UEL: NA
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LEL: NA
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Noncombustible Solid
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Incompatibilities & Reactivities
Strong caustics, most metals [Note: Readily reacts with metals to form flammable hydrogen gas. DO NOT MIX WITH SOLUTIONS CONTAINING BLEACH OR AMMONIA.]
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Measurement Methods
NIOSH 7903; OSHA ID165SG
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash (>1.6%), Quick drench (>1.6%)
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First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
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Respirator Recommendations
NIOSH/OSHA
Up to 25 mg/m3:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode*
Up to 50 mg/m3:
(APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters.
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece
Up to 1000 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 an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
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Exposure Routes
inhalation, ingestion, skin and/or eye contact
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Symptoms
Irritation eyes, skin, upper respiratory system; eye, skin, burns; dermatitis
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Target Organs
Eyes, skin, respiratory system
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See also: INTRODUCTION
See ICSC CARD: 1008 |
