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 |
FormulaCH3OCH2OCH3 |
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% |
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| 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 |
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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
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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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