Formic acid

Synonyms & Trade Names
Formic acid (85-95% in aqueous solution), Hydrogen carboxylic acid, Methanoic acid
CAS No.
64-18-6
RTECS No.
DOT ID & Guide
1779 153
Formula
HCOOH
Conversion
1 ppm = 1.88 mg/m3
IDLH
30 ppm
See: 64186
Exposure Limits
NIOSH REL
TWA 5 ppm (9 mg/m3)
OSHA PEL
TWA 5 ppm (9 mg/m3)
Measurement Methods
NIOSH 2011;
OSHA ID186SG
See: NMAM or OSHA Methods
Physical Description
Colorless liquid with a pungent, penetrating odor. [Note: Often used in an aqueous solution.]
Molecular Weight
46.0
Boiling Point
224°F (90% solution)
Freezing Point
20°F (90% solution)
Solubility
Miscible
Vapor Pressure
35 mmHg
Ionization Potential
11.05 eV
Specific Gravity
1.22 (90% solution)
Flash Point
(oc) 122°F (90% solution)
Upper Exposive Limit
57% (90% solution)
Lower Explosive Limit
18% (90% solution)
Class II Combustible Liquid: Fl.P. at or above 100°F and below 140°F. (90% solution)
Incompatibilities & Reactivities
Strong oxidizers, strong caustics, concentrated sulfuric acid [Note: Corrosive to metals.]
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 nasal mucus); cough, dyspnea (breathing difficulty); nausea
Target Organs
Eyes, skin, respiratory system
Personal Protection/Sanitation
(See protection codes)
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
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 an N100, R100, or P100 filter.
Click here for information on selection of N, R, or P filters.
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0485
Page last reviewed: October 17, 2018