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| Formic acid | CAS 64-18-6 | ||
| HCOOH | RTECS LQ4900000 | ||
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Synonyms & Trade Names Formic acid (85-95% in aqueous solution); Hydrogen carboxylic acid; Methanoic acid |
DOT ID & Guide 1779 153 |
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Exposure Limits |
NIOSH REL: TWA 5 ppm (9 mg/m3) | ||
| OSHA PEL: TWA 5 ppm (9 mg/m3) | |||
| IDLH 30 ppm | Conversion 1 ppm = 1.88 mg/m3 | ||
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Physical Description Colorless liquid with a pungent, penetrating odor. [Note: Often used in an aqueous solution.] |
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MW: 46.0 |
BP: 224°F (90% solution) |
FRZ: 20°F (90% solution) |
Sol: Miscible |
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VP: 35 mmHg |
IP: 11.05 eV |
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Sp.Gr: 1.22 (90% solution) |
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Fl.P(oc): 122°F (90% solution) |
UEL: 57% (90% solution) |
LEL: 18% (90% solution) |
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| Class II Combustible Liquid (90% solution) | |||
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Incompatibilities & Reactivities Strong oxidizers, strong caustics, concentrated sulfuric acid [Note: Corrosive to metals.] |
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Measurement Methods NIOSH 2011; OSHA ID186SG |
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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 Provide: Eyewash, Quick drench |
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 30 ppm: (APF = 10) Any supplied-air respirator*/(APF = 50) Any self-contained breathing apparatus with a full facepiece 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 (gas mask) with a chin-style, front- or back-mounted organic vapor canister having 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, throat; skin burns, dermatitis; lacrimation (discharge of tears); rhinorrhea (discharge of thin mucus); cough, dyspnea (breathing difficulty); nausea | |
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Target Organs
Eyes, skin, respiratory system |
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| See also: INTRODUCTION |