- Sulfuric acid, dimethyl ester
- Dimethyl monosulfate
Colorless, oily liquid, faint onion odor.
Formerly as war gas, manufacture of dyes, colors, perfumes, solvent for separation of mineral oils, analysis of auto fluids.
Registry Numbers and Inventories.
EC Index Number
Carcinogenic Category 2; Mutagenic Category 3; Very toxic; Toxic; Corrosive; Sensitising
R 45 E25 E26 34 43 68
S 53 45
Tumorigen; Mutagen; Reproductive Effector; Human Data; Primary Irritant
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
Boiling point, °C
Vapor pressure, mmHg
0.85 (25 C)
Vapor density (air=1)
660 ppm (0.06%) at 20 C (calculated)
1.349 g/cm3 (0 C)
Solubility in water
40.12 g/s2 (18 C)
1.3861 (15.8 C)
Partition coefficient, pKow
Heat of vaporization
Hazards and Protection.
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container. Corrosives area. Do not store in metal containers.
Wash thoroughly after handling. Wash hands before eating. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Do not get in eyes, on skin, or on clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Do not ingest or inhale. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Clean up spills immediately, using the appropriate protective equipment. Scoop up with a nonsparking tool, then place into a suitable container for disposal. Provide ventilation.
Stable under normal temperatures and pressures.
Strong oxidizing agents, strong bases, ammonia, and moist air or water. Can react violently with ammonium hydroxide and sodium azide.
Carbon monoxide, oxides of sulfur, irritating and toxic fumes and gases, carbon dioxide.
Upper exp. limit, %
Lower exp. limit, %
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use water spray to keep fire-exposed containers cool. Containers may explode in the heat of a fire. Combustible Liquid. Contact with metals may evolve flammable hydrogen gas. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam. For small fires, use dry chemical, carbon dioxide, sand, earth, water spray or regular foam. Cool containers with flooding quantities of water until well after fire is out.
Moderately flammable. Requires moderate heating.
Material is normally stable even under fire exposure conditions and is not hazardously reactive with water. It is incompatible with strong oxidizers and strong ammonia solutions.
Combustion may produce irritants and toxic gases.
OSHA PEL: TWA 1 ppm (5 mg/m3) skin NIOSH REL: Ca TWA 0.1 ppm (0.5 mg/m3) skin See Appendix A NIOSH IDLH: Potential occupational carcinogen 7 ppm
G-A3, I-2A, N-2, CP65
May cause liver and kidney damage. May cause cancer in humans. May cause reproductive and fetal effects.
Harmful if swallowed. Causes gastrointestinal tract burns. Effects may be delayed 2 to 4 hours.
May be fatal if inhaled. Effects may be delayed. Causes severe irritation of upper respiratory tract with coughing, burns, breathing difficulty, and possible coma. May cause lung damage. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema.
Causes skin burns.
Causes eye burns. May cause irreversible eye injury.
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration.
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Destroy contaminated shoes.
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.