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Acetic acid

Synonyms & Trade Names
Acetic acid (aqueous), Ethanoic acid, Glacial acetic acid, Methanecarboxylic acid [Note: Can be found in concentrations of 5-8% in vinegar.]
CAS No.
64-19-7
RTECS No.
AF1225000
DOT ID & Guide
2790 153(10-80% acid)
2789 132(>80% acid)
Formula
CH₃COOH
Conversion
1 ppm = 2.46 mg/m3
IDLH
50 ppm
See: 64197
Exposure Limits
NIOSH REL
TWA 10 ppm (25 mg/m3) ST 15 ppm (37 mg/m3)
OSHA PEL
TWA 10 ppm (25 mg/m3)
Measurement Methods
NIOSH 1603;
OSHA ID186SG
See: NMAM or OSHA Methods
Physical Description
Colorless liquid or crystals with a sour, vinegar-like odor. [Note: Pure compound is a solid below 62°F. Often used in an aqueous solution.]
Molecular Weight
60.1
Boiling Point
244°F
Freezing Point
62°F
Solubility
Miscible
Vapor Pressure
11 mmHg
Ionization Potential
10.66 eV
Specific Gravity
1.05
Flash Point
103°F
Upper Exposive Limit
(200°F): 19.9%
Lower Explosive Limit
4.0%
Class II Combustible Liquid: Fl.P. at or above 100°F and below 140°F.
Incompatibilities & Reactivities
Strong oxidizers (especially chromic acid, sodium peroxide & nitric acid), strong caustics [Note: Corrosive to metals.]
Exposure Routes
inhalation, skin and/or eye contact
Symptoms
irritation eyes, skin, nose, throat; eye, skin burns; skin sensitization; dental erosion; black skin, hyperkeratosis; conjunctivitis, lacrimation (discharge of tears); pharyngeal edema, chronic bronchitis
Target Organs
Eyes, skin, respiratory system, teeth
Personal Protection/Sanitation
(See protection codes)
Skin:Prevent skin contact (>10%)
Eyes:Prevent eye contact
Wash skin:When contaminated (>10%)
Remove:When wet or contaminated (>10%)
Change:No recommendation
Provide:Eyewash (>5%), Quick drench (>50%)
First Aid
(See procedures)
Eye:Irrigate immediately
Skin:Water flush immediately
Breathing:Respiratory support
Swallow:Medical attention immediately
Respirator Recommendations

NIOSH/OSHA

Up to 50 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode£
(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)£
(APF = 50) Any chemical cartridge respirator with a full facepiece and organic vapor cartridge(s)
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister
(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 organic vapor canister
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0363

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