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| Dimethyl sulfate | CAS 77-78-1 | ||
| (CH3)2SO4 | RTECS WS8225000 | ||
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Synonyms & Trade Names Dimethyl ester of sulfuric acid, Dimethylsulfate, Methyl sulfate |
DOT ID & Guide 1595 156 |
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Exposure Limits |
NIOSH REL: Ca TWA 0.1 ppm (0.5 mg/m3) [skin] See Appendix A | ||
| OSHA PEL�: TWA 1 ppm (5 mg/m3) [skin] | |||
| IDLH Ca [7 ppm] | Conversion 1 ppm = 5.16 mg/m3 | ||
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Physical Description Colorless, oily liquid with a faint, onion-like odor. |
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MW: 126.1 |
BP: 370°F (Decomposes) |
FRZ: -25°F |
Sol(64°F): 3% |
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VP: 0.1 mmHg |
IP: ? |
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Sp.Gr: 1.33 |
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Fl.P: 182°F |
UEL: ? |
LEL: ? |
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| Class IIIA Combustible Liquid: Fl.P. at or above 140�F and below 200�F. | |||
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Incompatibilities & Reactivities Strong oxidizers, ammonia solutions [Note: Decomposes in water to sulfuric acid; corrosive to metals.] |
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Measurement Methods NIOSH 2524 |
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Personal Protection & Sanitation 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 |
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Respirator Recommendations
NIOSH At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration: (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 canister providing protection against the compound of concern/Any appropriate escape-type, self-contained breathing apparatus |
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| Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact | |
| Symptoms Irritation eyes, nose; headache; dizziness; conjunctivitis; photophobia (abnormal visual intolerance to light); periorbital (situated around the eye) edema; dysphonia, aphonia, dysphagia, productive cough; chest pain; dyspnea (breathing difficulty), cyanosis; vomiting, diarrhea; dysuria; analgesia; fever; proteinuria, hematuria (blood in the urine); eye, skin burns; delirium; [potential occupational carcinogen] | |
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Target Organs
Eyes, skin, respiratory system, liver, kidneys, central nervous system Cancer Site [in animals: nasal & lung cancer] |
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| See also: INTRODUCTION |