1,1,3,3-tetramethyldisiloxane

Guidance on Safe Use

First-aid measures

General advice: First Aid responders should pay attention to self-protection and use the recommended protective clothing (chemical resistant gloves, splash protection).  

Inhalation: Move person to fresh air and keep comfortable for breathing.  If not breathing, give artificial respiration; if by mouth to mouth use rescuer protection (pocket mask, etc).  If breathing is difficult, oxygen should be administered by qualified personnel.  Call a physician or transport to a medical facility.  

Skin contact: Wash off with plenty of water.  

Eye contact: Flush eyes thoroughly with water for several minutes.  Remove contact lenses after the initial 1-2 minutes and continue flushing for several additional minutes.  If effects occur, consult a physician, preferably an ophthalmologist.  

Ingestion: Do not induce vomiting. Call a physician and/or transport to emergency facility immediately.  

Fire-fighting measures

Extinguishing media: Suitable extinguishing media: Alcohol-resistant foam.  Carbon dioxide (CO2).  

Unsuitable extinguishing media: Dry chemical.  High volume water jet.  Do not use direct water stream.

Special hazards arising from the substance or mixture

Hazardous combustion products: Carbon oxides.  Silicon oxides.  Formaldehyde.  

Unusual Fire and Explosion Hazards: Flash back possible over considerable distance..  Applying foam will release significant amounts of hydrogen gas that can be trapped under the foam blanket..  Exposure to combustion products may be a hazard to health..  Closed containers may rupture via pressure build-up when exposed to fire or extreme heat..  Fire burns more vigorously than would be expected..  Vapours may form explosive mixtures with air..  

Advice for firefighters

Fire Fighting Procedures: Use water spray to cool unopened containers..  Evacuate area..  Collect contaminated fire extinguishing water separately. This must not be discharged into drains..  Fire residues and contaminated fire extinguishing water must be disposed of in accordance with local regulations..  Use water spray to cool fire exposed containers and fire affected zone until fire is out and danger of reignition has passed..  Do not use a solid water stream as it may scatter and spread fire..  

Use extinguishing measures that are appropriate to local circumstances and the surrounding environment.  Do not allow extinguishing medium to contact container contents. Most fire extinguishing media will cause hydrogen evolution, and once the fire is put out, may accumulate in poorly ventilated or confined areas and result in flash fire or explosion if ignited.  Remove undamaged containers from fire area if it is safe to do so.  

Special protective equipment for firefighters: Wear self-contained breathing apparatus for firefighting if necessary..  Use personal protective equipment..  

Accidental release measures

Personal precautions, protective equipment and emergency procedures: Remove all sources of ignition.  Ventilate the area.  Eliminate all sources of ignition in vicinity of spill or released vapor to avoid fire or explosion.  Ground and bond all containers and handling equipment.  Vapor explosion hazard. Keep out of sewers.  Follow safe handling advice and personal protective equipment recommendations.  

Environmental precautions: Discharge into the environment must be avoided.  Prevent further leakage or spillage if safe to do so.  Prevent spreading over a wide area (e.g. by containment or oil barriers).  Retain and dispose of contaminated wash water.  Local authorities should be advised if significant spillages cannot be contained.  

Methods and materials for containment and cleaning up: Non-sparking tools should be used.  Soak up with inert absorbent material.  Suppress (knock down) gases/vapours/mists with a water spray jet.  Clean up remaining materials from spill with suitable absorbant.  Local or national regulations may apply to releases and disposal of this material, as well as those materials and items employed in the cleanup of releases. You will need to determine which regulations are applicable.  For large spills, provide dyking or other appropriate containment to keep material from spreading. If dyked material can be pumped, store recovered material in appropriate container.  Materials in contact with water, moisture, acids or bases have the potential to generate hydrogen gas. Recovered material should bestored in a vented container.  Dispose of saturated absorbent or cleaning materials appropriately, since spontaneous heating may occur.  Recovered material should be stored in a vented container. The vent must prevent the ingress of water as further reaction with spilled materials can take place which could lead to overpressurization of the container.  

Handling and storage

Precautions for safe handling: Keep container tightly closed.  Keep away from water.  Protect from moisture.  Keep away from heat and sources of ignition.  Take precautionary measures against static discharges.  Take care to prevent spills, waste and minimize release to the environment.  Non-sparking tools should be used.  Handle in accordance with good industrial hygiene and safety practice.  CONTAINERS MAY BE HAZARDOUS WHEN EMPTY.  Since emptied containers retain product residue follow all (M)SDS and label warnings even after container is emptied.  

Use with local exhaust ventilation.  Use only in an area equipped with explosion proof exhaust ventilation.  Ensure all equipment is electrically grounded before beginning transfer operations.  This material can accumulate static charge due to its inherent physical properties and can therefore cause an electrical ignition source to vapors. In order to prevent a fire hazard, as bonding and grounding may be insufficient to remove static electricity, it isnecessary to provide an inert gas purge before beginning transfer operations.  Restrict flow velocity in order to reduce the accumulation of static electricity.  Ground and bond container and receiving equipment.  

Conditions for safe storage, including any incompatibilities: Keep in properly labelled containers.  Store in original container.  Keep tightly closed.  Keep in a cool, well-ventilated place.  Store in accordance with the particular national regulations.  Keep away from heat and sources of ignition.  Product may evolve minute quantities of flammable hydrogen gas which can accumulate. Adequately ventilate to maintain vapors well below flammability limits and exposure guidelines. Do not repackage. Clogged container vents may increase pressure build up.  Store in a closed container.  

Do not store with the following product types:  Strong oxidizing agents.  Organic peroxides.  Flammable solids.  Pyrophoric liquids.  Pyrophoric solids.  Self-heating substances and mixtures.  Substances and mixtures, which in contact with water, emit flammable gases.  Explosives.  Gases.  

Unsuitable materials for containers: Do not store in or use containers except the original product package.  

Transport information

Land transport (UN RTDG/ADR/RID)

UN number:

UN No. : 1993

Shipping information

Proper shipping name and description:

Proper Shipping Name : FLAMMABLE LIQUID, N.O.S.(Tetramethyldisiloxane)

Chemical name:

Tetramethyldisiloxane

Language:

English

Packing group:

Packing group II: Substances presenting medium danger

Labels:

Labels : 3

SpecialProvisions

Shipping

Remarks

Marine transport (UN RTDG/IMDG)

UN number:

UN 1993

Shipping information

Proper shipping name and description:

Proper Shipping Name : FLAMMABLE LIQUID, N.O.S.(Tetramethyldisiloxane)

Chemical name:

Tetramethyldisiloxane

Packing group:

Packing group II: Substances presenting medium danger

Labels:

Labels : flammable liquid

Remarks

Air transport (UN RTDG/ICAO/IATA)

UN number:

UN No. : UN 1993

Shipping information

Proper shipping name and description:

Proper Shipping Name : Flammable liquid, n.o.s.(Tetramethyldisiloxane)

Chemical name:

Tetramethyldisiloxane

Packing group:

Packing group II: Substances presenting medium danger

Labels:

Labels : Flammable Liquid

Special provisions / remarks

Remarks:

VENTED PACKAGES ARE FORBIDDEN FOR AIR TRANSPORT.

SpecialProvisions

Exposure controls / personal protection

Exposure controls

Engineering controls: Use engineering controls to maintain airborne level below exposure limit requirements or guidelines.  If there are no applicable exposure limit requirements or guidelines, use only with adequate ventilation.  Local exhaust ventilation may be necessary for some operations.  

Individual protection measures

Eye/face protection: Use safety glasses (with side shields).  Safety glasses (with side shields) should be consistent with EN 166 or equivalent.  

Skin protection

Hand protection: Use gloves chemically resistant to this material when prolonged or frequently repeated contact could occur.  Use chemical resistant gloves classified under Standard EN374: Protective gloves against chemicals and micro-organisms.  Examples of preferred glove barrier materials include:  Butyl rubber.  Neoprene.  Nitrile/butadiene rubber ("nitrile" or "NBR").  Ethyl vinyl alcohol laminate ("EVAL").  Polyvinyl alcohol ("PVA").  Polyvinyl chloride ("PVC" or "vinyl").  Viton.  Examples of acceptable glove barrier materials include:  Natural rubber ("latex").  When prolonged or frequently repeated contact may occur, a glove with a protection class of 3 or higher (breakthrough time greater than 60 minutes according to EN 374) is recommended.  Glove thickness alone is not a good indicator of the level of protection a glove provides against a chemical substance as this level of protection is also highly dependent on the specific composition of the material that the glove is fabricated from. The thickness of the glove must, depending on model and type of material, generally be more than 0.35 mm to offer sufficient protection for prolonged and frequent contact with the substance. As an exception to this general rule it is known that multilayer laminate gloves may offer prolonged protection at thicknesses less than 0.35 mm. Other glove materials with a thickness of less than 0.35 mm may offer sufficient protection when only brief contact is expected.  NOTICE: The selection of a specific glove for a particular application and duration of use in a workplace should also take into account all relevant workplace factors such as, but not limited to: Other chemicals which may be handled, physical requirements (cut/puncture protection, dexterity, thermal protection), potential body reactions to glove materials, as well as the instructions/specifications provided by the glove supplier.  

Other protection: Wear clean, body-covering clothing.  

Respiratory protection: Respiratory protection should be worn when there is a potential to exceed the exposure limit requirements or guidelines.  If there are no applicable exposure limit requirements or guidelines, use an approved respirator.  Selection of air-purifying or positive-pressure supplied-air will depend on the specific operation and the potential airborne concentration of the material.  For emergency conditions, use an approved positive-pressure self-contained breathing apparatus.  

Use the following CE approved air-purifying respirator:  Organic vapor cartridge, type A (boiling point >65 ºC, meeting standard EN 14387).  

Stability and reactivity

Reactivity: Not classified as a reactivity hazard.  

Chemical stability: Stable under normal conditions.  

Possibility of hazardous reactions: Can react with strong oxidizing agents.  When heated to temperatures above 150 °C (300 °F) in the presence of air, product can form formaldehyde vapours.  Safe handling conditions may be maintained by keeping vapour concentrations within the occupational exposure limit for formaldehyde.  Vapours may form explosive mixture with air.  Product may evolve flammable hydrogen gas on contact with water, alcohols, acidic or basic materials, many metals or metallic compounds and can form explosive mixtures in air.  Hazardous decomposition products will be formed at elevated temperatures.  Highly flammable liquid and vapour.  

Conditions to avoid: Heat, flames and sparks.  Exposure to moisture  

Incompatible materials: Oxidizing agents  

Hazardous decomposition products:

Decomposition products can include and are not limited to:  Formaldehyde.  

Disposal considerations

Waste treatment methods

Do not dump into any sewers, on the ground, or into any body of water.  This product, when being disposed of in its unused and uncontaminated state should be treated as a hazardous waste according to EC Directive 2008/98/EC.  Any disposal practices must be in compliance with all national and provincial laws and any municipal or local by-laws governing hazardous waste.  For used, contaminated and residual materials additional evaluations may be required.  

The definitive assignment of this material to the appropriate EWC group and thus its proper EWC code will depend on the use that is made of this material. Contact the authorized waste disposal services.