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| Hydrogen cyanide | CAS 74-90-8 | ||
| HCN | RTECS MW6825000 | ||
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Synonyms & Trade Names Formonitrile, Hydrocyanic acid, Prussic acid |
DOT ID & Guide 1051 117 (>20% solution) 1051 117 (anhydrous) 1613 154 (</=20% solution) |
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Exposure Limits |
NIOSH REL: ST 4.7 ppm (5 mg/m3) [skin] | ||
| OSHA PEL�: TWA 10 ppm (11 mg/m3) [skin] | |||
| IDLH 50 ppm | Conversion 1 ppm = 1.10 mg/m3 | ||
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Physical Description Colorless or pale-blue liquid or gas (above 78°F) with a bitter, almond-like odor. [Note: Often used as a 96% solution in water.] |
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MW: 27.0 |
BP: 78°F (96%) |
FRZ: 7°F (96%) |
Sol: Miscible |
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VP: 630 mmHg |
IP: 13.60 eV |
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Sp.Gr: 0.69 |
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Fl.P: 0°F (96%) |
UEL: 40.0% |
LEL: 5.6% |
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| Class IA Flammable Liquid Flammable Gas | |||
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Incompatibilities & Reactivities Amines, oxidizers, acids, sodium hydroxide, calcium hydroxide, sodium carbonate, caustics, ammonia [Note: Can polymerize at 122-140°F.] |
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Measurement Methods NIOSH 6010 |
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Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet (flammable) 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 Up to 47 ppm: (APF = 10) Any supplied-air respirator Up to 50 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator 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 canister providing protection against the compound of concern/Any appropriate escape-type, self-contained breathing apparatus |
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| Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact | |
| Symptoms Asphyxia; lassitude (weakness, exhaustion), headache, confusion; nausea, vomiting; increased rate and depth of respiration or respiration slow and gasping; thyroid, blood changes | |
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Target Organs
central nervous system, cardiovascular system, thyroid, blood |
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| See also: INTRODUCTION |