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| Phosphoric acid | CAS 7664-38-2 | ||
| H3PO4 | RTECS TB6300000 | ||
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Synonyms & Trade Names Orthophosphoric acid, Phosphoric acid (aqueous), White phosphoric acid |
DOT ID & Guide 1805 154 |
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Exposure Limits |
NIOSH REL: TWA 1 mg/m3 ST 3 mg/m3 | ||
| OSHA PEL�: TWA 1 mg/m3 | |||
| IDLH 1000 mg/m3 | 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 |
BP: 415°F |
MLT: 108°F |
Sol: Miscible |
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VP: 0.03 mmHg |
IP: ? |
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Sp.Gr(77°F): 1.87 (pure) 1.33 (50% solution) |
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Fl.P: NA |
UEL: NA |
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 |
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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: Daily Provide: Eyewash (>1.6%), Quick drench (>1.6%) |
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 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 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 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, upper respiratory system; eye, skin, burns; dermatitis | |
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Target Organs
Eyes, skin, respiratory system |
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| See also: INTRODUCTION |