Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

First-aid measures

Start Treatment immediately if exposure is suspected, even if there is no evidence of injury. Redness of the eyes (bloodshot) indicates exposure to very low concentrations of vapour.

Inhalation: If inhaled, remove to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Call a physician.

Skin contact: In case of contact, immediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes. Call a physician.

Eye contact: In case of contact, immediately flush eyes with plenty of water for at least 15 minutes. Call a physician.

Ingestion: If swallowed, do not induce vomiting. Give large quantities of water or activated charcoal slurry. Call a physician immediately. Never give anything by mouth to an unconscious person.

Note: To prepare activated charcoal slurry, suspend 50 grams of activated charcoal in 400 mL of water and mix thoroughly. Give 5 mL/kg, or 350 mLfor an average adult.

Notes to Physicians: Severe symptoms may be delayed for 10 hours or more.

Fire-fighting measures

Evacuate area. Stay upwind and carefully avoid smoke and any possible fumes. Use caution in approaching advanced or massive fires. Product may generate pressure from heat and rupture drums.

Suitable extinguishing media: water mist, foam, dry powder, CO2

Extinguishing media that must not be used for safety reasons: water  

Further information: Decontaminate all equipment including personal protective equipment used in firefighting efforts before returning to service. Fire residues and contaminated firefighting media must be disposed of in accordance with the local regulations.

Accidental release measures

In case of leakage close to sources of running water. Evacuate area; keep upwind. Wear full chemical proof suit with hood and breathing air supply to enter spill area. Dike spill: neutralize with dry soda ash followed by water flood, 2-5% solution of ammonia, or dilute caustic soda solution. Let stand until a negative test for DMS is obtained, then transfer to containers for disposal and flush spill area with plenty of water. Do not allow to enter surface waters or groundwater.

Handling and storage

Handling (Personnel): Do not breathe vapor or mist. Do not get in eyes, on skin, or on clothing. Wash thoroughly after handling and before eating or smoking. Avoid contact with any liquid in vicinity of vessels containing DMS; assume liquid is DMS.

Protection against fire and explosion: Keep away from sources of ignition. Take precautionary measures against static discharges. At temperatures above 90°C explosible mixtures in air are formed.

Storage: Store in a well-ventilated area away from heat and flame and out of direct sun. Keep containers closed. Do not store and transport together with strong alkaline materials, strong oxidizers and highly flammable materials. Close empty drums tightly before returning to supplier. Use entire container, do not wash out.

Temperature class: ignition temperature higher than 450°C

Storage class: 3B Combustible liquids

Transport information

Land transport (UN RTDG/ADR/RID)

UN number:
UN 1595
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6.1, 8
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Inland waterway transport (UN RTDG/ADN(R))

UN number:
UN 1595
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6.1, 8
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Marine transport (UN RTDG/IMDG)

UN number:
UN 1595
Shipping information
Proper shipping name and description:
Chemical name:
Dimethyl sulphate
6.1, 8
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Exposure controls / personal protection

MAK value              0,04 ppm              0,2mg/m3

Engineering Controls: Use with sufficient ventilation to keep employee exposure below recommended limits. Handle in a closed system, if possible.

Wear appropriate protective equipment to prevent any eye or skin contact with liquid or vapor.

Eye/face protection: Wear gas-tight chemical splash goggles with full-length face shield.

Protective clothing: Wear appropriate chemical proof clothing to prevent any contact with liquid or vapor such as gloves, boots and impervious chemical suit with hood. In the event of contamination change protective clothing immediately. Avoid skin contact with the wetted surfaces of the protective gloves

Respirators: Where this is potential for airborne exposure in excess of applicable limits, use approved respirator mask.

Note: Thorough decontamination of personal protective equipment is necessary before removal.

Stability and reactivity

Chemical Stability: Stable. No hazardous reactions, when used as directed.

Incompatibility: Incompatible with strong ammonia solutions and other strong alkaline materials, sodium azide, and strong oxidizers including strong caustic solutions.

Decomposition: Reacts with water or moisture to give methyl hydrogen sulfate and, eventually, sulfuric acid and methanol.

Polymerization: Polymerization will not occur.

Disposal considerations

Product: Examine possibilities for re-utilization. Package product wastes. Close and label the waste receptacles and, likewise, any uncleaned empty containers. Dispose of them at a suitable waste incineration plant in accordance with the official regulations.

Uncleaned packaging: Soiled, empty containers are to be treated in the same way as the contents.