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Methylal

Synonyms & Trade Names
Dimethoxymethane, Formal, Formaldehyde dimethylacetal, Methoxymethyl methyl ether, Methylene dimethyl ether
CAS No.
109-87-5
RTECS No.
PA8750000
DOT ID & Guide
1234 127
Formula
CH3OCH2OCH3
Conversion
1 ppm = 3.11 mg/m3
IDLH
2200 ppm [10%LEL]
See: 109875
Exposure Limits
NIOSH REL
: TWA 1000 ppm (3100 mg/m3)
OSHA PEL
: TWA 1000 ppm (3100 mg/m3)
Measurement Methods

NIOSH 1611
See: NMAM or OSHA Methods
Physical Description
Colorless liquid with a chloroform-like odor.
MW:
76.1
BP:
111°F
FRZ:
-157°F
Sol:
33%
VP:
330 mmHg
IP:
10.00 eV
Sp.Gr:
0.86
Fl.P(oc): -26°F
UEL:
13.8%
LEL:
2.2%
Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
Incompatibilities & Reactivities
Strong oxidizers, acids
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
irritation eyes, skin, upper respiratory system; anesthesia
Target Organs
Eyes, skin, respiratory system, central nervous system
Personal Protection/Sanitation
(See protection codes)
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 promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations

NIOSH/OSHA

Up to 2200 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
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

See also: INTRODUCTION   See ICSC CARD: 1152
 
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