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 Explosive 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

Acetic acid

NIOSH REL

OSHA PEL

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