NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Ethyl formate

CAS
109-94-4

CH3CH2OCHO

RTECS
LQ8400000
Synonyms & Trade Names

Ethyl ester of formic acid, Ethyl methanoate
DOT ID & Guide
1190 / 129

Exposure
Limits

NIOSH REL: TWA 100 ppm (300 mg/m3)
OSHA PEL: TWA 100 ppm (300 mg/m3)
IDLH
1500 ppm See: 109944
Conversion
1 ppm = 3.03 mg/m3
Physical Description
Colorless liquid with a fruity odor.
MW: 74.1
BP: 130°F
FRZ: -113°F
Sol(64°F): 9%
VP: 200 mmHg
IP: 10.61 eV

Sp.Gr: 0.92
Fl.P: -4°F
UEL: 16.0%
LEL: 2.8%

Class IB Flammable Liquid: Fl.P. below 73F and BP at or above 100F.
Incompatibilities & Reactivities

Nitrates; strong oxidizers, alkalis & acids [Note: Decomposes slowly in water to form ethyl alcohol and formic acid.]
Measurement Methods
NIOSH 1452; OSHA 7
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet (flammable)
Change: No recommendation

First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
NIOSH/OSHA
Up to 1500 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
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
Irritation eyes, upper respiratory system; in animals: narcosis
Target Organs
Eyes, respiratory system, central nervous system
See also: INTRODUCTION   See ICSC CARD: 0623