Registration Dossier

Guidance on Safe Use

Guidance on Safe Use

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Administrative data

First-aid measures

On contact with eyes : Rinse immediately with plenty of water and seek medical advice.
On skin contact : Rinse immediately with plenty of water for at least 15 minutes. Obtain medical attention immediately.
If inhaled : Remove to fresh air. Obtain medical attention immediately.
On ingestion : Do not induce vomiting. Obtain medical attention immediately.

Most important
symptoms/effects, acute and delayed:
Toxic if swallowed.
Toxic if inhaled.
Causes severe skin burns and eye damage.
Corrosive to the respiratory tract.

Fire-fighting measures

Suitable extinguishing media : On large fires use medium expansion (>30:1) AFFF alcohol compatible foam. On small
fires use medium expansion (>30:1) AFFF alcohol compatible foam, CO2 or dry sand. Water can be used to cool fire exposed containers.
Unsuitable extinguishing media : Do not use water. Dry powder. Do not allow extinguishing medium to contact container
contents.
Hazards during fire fighting : Vapours are heavier than air and can travel along ground to remote ignition sources.
Electrostatic charges may be generated during transfer of product from its container. Ensure that all equipment is electrically earthed. Fire releases dense, irritating, and corrosive hydrogen chloride fumes. Chlorosilanes react vigorously with water. Do not apply water directly to the fire. In some cases it may be better to let fire burn until expert assistance is obtained. Material may reignite after fire is extinguished.
Vapours may form explosive mixtures with air.

Hazardous Combustion : Thermal breakdown of this product during fire or very high heat conditions may evolveProducts the following decomposition products: Silica. Carbon oxides and traces of incompletely burned carbon compounds. Formaldehyde. Hydrogen. Chlorine compounds.

Special protective equipment/procedures : A self-contained respirator and protective clothing should be worn. Spill clean up may
require special clothing. Determine the need to evacuate or isolate the area according to your local emergency plan. Fires are difficult to extinguish by conventional methods. Do not put water directly on the fire, however water may be used to knock down the corrosive vapor cloud down wind of fire. Apply medium expansion (30:1) AFFF alcohol compatible foam. Applying foam initially will release significant amounts of corrosive hydrogen chloride vapours which will be reduced when uniform blanketing is achieved. Use water spray to keep fire exposed containers cool. Do not allow any extinguishing media to enter container. Applying foam will also release significant amounts of flammable hydrogen gas that can be trapped under the foam blanket.

Accidental release measures

Personal precautions, protective equipment and emergency procedures : A self-contained respirator and protective clothing should be worn. Determine the need to evacuate or isolate the area according to your local emergency plan. Eliminate all possible sources of ignition.

Environmentalprecautions : Prevent from spreading or entering into drains, ditches or rivers by using sand, earth or
other appropriate barriers. Inform local authorities if this cannot be prevented.

Methods and materials for containment and cleaning up : Eliminate all possible sources of ignition. Determine the need to evacuate or isolate the
area according to your local emergency plan. Mop, wipe or soak up with absorbent material and place in a vented container. Soak up with sand or other noncombustible absorbent material and place in a container. Do not get water on spilled material. Very
large spills should be contained by bunding, etc... procedures. Applying foam initially will release significant amounts of corrosive hydrogen chloride vapors which will be reduced when uniform blanketing is achieved. Applying foam will also release significant
amounts of flammable hydrogen gas that can be trapped under the foam blanket.

Handling and storage

Advice on safe handling : General ventilation is required. Local ventilation is required. Avoid skin and eye contact. Do not breathe vapour. Do not ingest. Do not empty into drains.

Advice on storage : This product slowly evolves hydrogen on storage. Keep container closed and store away from water or moisture. Store in a flameproof, well ventilated area. Electrostatic charges may be generated during transfer of product from its container. Ensure that all equipment is electrically earthed. In general chlorosilanes containing Silicon-Hydride (SiH) must be stored in pressurized packaging but some exceptions do exist. In any case the material should not be repacked without guidance from Dow Corning’s packaging experts. Do not
store in or use glass containers. Vapours may form explosive mixtures with air. Storage temperature: minimum -29 °C, maximum 54 °C

Transport information

Land transport (ADR/RID)

UN number:
UN 1242
Proper shipping name and description:
METHYLDICHLOROSILANE
Chemical name:
METHYLDICHLOROSILANE
Language:
English
Class:
4.3(3;8)
Classification code:
WFC
Packaging group:
I
Labels:
4.3
3
8
SpecialProvisionsopen allclose all

Inland waterway transport (ADN(R))

UN number:
UN 1242
Proper shipping name and description:
METHYLDICHLOROSILANE
Chemical name:
METHYLDICHLOROSILANE
Language:
English
Classification code:
nan
Packaging group:
I
Labels:
4.3
3
8
Remarksopen allclose all

Marine transport (IMDG)

UN number:
UN 1242
Proper shipping name and description:
METHYLDICHLOROSILANE
Chemical name:
METHYLDICHLOROSILANE
Class:
4.3(3;8)
Packaging group:
I
EmS code:
IF-G
S-O
Labels:
dangerous when wet
flammable liquid
corrosive
Remarksopen allclose all

Air transport ICAO/IATA

UN number:
Forbidden
Proper shipping name and description:
forbidden
Chemical name:
NA
Class:
NA
Packaging group:
NA
Labels:
NA
Remarksopen allclose all
SpecialProvisionsopen allclose all

Exposure controls / personal protection

Engineering Controls : Ventilation : Local Exhaust ventilation (LEV)
Respiratory protection : Suitable respiratory protection should be worn if the product is used in large quantities,
confined spaces or in other circumstances where the OEL may be approached or exceeded. Depending on the working conditions, wear a respiratory mask with ABEK-filter filter(s) E or use a self-contained respirator. The choice of a filter type depends on the amount and type of chemical being handled in the workplace.
Hand protection : Suitable, heavy duty, plastic or rubber gauntlets should be worn: Nitrile rubber. Silver shield(TM). 4H(TM). Viton(TM), (5-layer laminate of PE and EVOH (4H) or Butyl & Viton types recommended); Regarding glove's breakthrough time,contact your chemical protective glove supplier.
Eye/face protection : Face shield or safety goggles.
Skin protection : Wear impervious overalls in circumstances where significant skin contact can occur.
Hygiene measures : Exercise good industrial hygiene practice. Wash after handling, especially before eating, drinking or smoking. Remove contaminated clothing immediately.

Stability and reactivity

Reactivity : Reaction with water or even atmospheric moisture will produce large amounts of hydrogen chloride vapour. Hydrogen is liberated on contact with water, alcohols, acidic or basic materials, many metals or metallic compounds and can form explosive mixtures
in air.
Stability : Stable under normal usage conditions.
Possibility of hazardousreactions: Some hydrogen gas may be released. Hydrogen is flammable and can form explosive
mixtures with air.
Conditions to avoid : Eliminate all possible sources of ignition.
Materials to avoid : Keep from any possible contact with water. Protect from moisture
Hazardous decomposition products : Thermal breakdown of this product during fire or very high heat conditions may evolve
the following decomposition products: Silica. Carbon oxides and traces of incompletely burned carbon compounds. Formaldehyde. Hydrogen. Chlorine compounds.

Disposal considerations

Product and packaging disposal : Unhydrolysed material must be hydrolysed with excess water and the acid produced neutralised with weak alkali. After hydrolysis, the residue can be disposed of in accordance with local regulations. According to the European Waste Catalogue, Waste Codes a e not product specific, but application specific. Waste codes should be assigned by the user, preferably in discussion with the waste disposal authorities.