(CH3)2SiCl2

(CH3)2SiCl2 - Names and Identifiers

Name	Dichlorodimethylsilane
Synonyms	sylon ct SILANE M2 (CH3)2SiCl2 silanization sol. ii Dimethyl-dichlorsilan SILANISATION SOLUTION Dimethyldichlorosilane dichlorodimethyl-silan Dichlorodimethylsilane Dichlorodimethylsilicon SILANIZATION SOLUTION I dimethyldichlorosilicane Dimethylsilyl dichloride Silanization solution II
CAS	75-78-5
EINECS	200-901-0
InChI	InChI=1/C2H6Cl2Si/c1-5(2,3)4/h1-2H3

(CH3)2SiCl2 - Physico-chemical Properties

Molecular Formula	C2H6Cl2Si
Molar Mass	129.06
Density	1.333g/mLat 20°C
Melting Point	-76 °C
Boling Point	70°C(lit.)
Flash Point	3°F
Water Solubility	reacts
Solubility	sol chlorinated solvents and ethereal solvents; reactswith protic solvents.
Vapor Presure	<200 hPa (20 °C)
Appearance	liquid
Specific Gravity	1.0637
Color	colorless
BRN	605287
Storage Condition	Store below +30°C.
Stability	Stable. Reacts violently with water and alcohols. Highly flammable. Incompatible with strong oxidizing agents, water, alcohols, caustics, ammonia.
Sensitive	8: reacts rapidly with moisture, water, protic solvents
Explosive Limit	1.75-48.5%(V)
Refractive Index	n20/D 1.500
Physical and Chemical Properties	Character: colorless liquid. melting point -76 ℃ boiling point 70.5 ℃ relative density 1.062 refractive index 1.4023 flash point -8.9 ℃ soluble in benzene and ether.
Use	Synthesis of monomers and organic silicon compounds used as organic silicon resin

(CH3)2SiCl2 - Risk and Safety

Risk Codes	R20 - Harmful by inhalation R59 - Dangerous for the ozone layer R36/37/38 - Irritating to eyes, respiratory system and skin. R11 - Highly Flammable R67 - Vapors may cause drowsiness and dizziness R65 - Harmful: May cause lung damage if swallowed R63 - Possible risk of harm to the unborn child R48/20 - R38 - Irritating to the skin R20/21 - Harmful by inhalation and in contact with skin. R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R37 - Irritating to the respiratory system R35 - Causes severe burns R20/22 - Harmful by inhalation and if swallowed. R14 - Reacts violently with water R34 - Causes burns
Safety Description	S60 - This material and its container must be disposed of as hazardous waste. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. S62 - If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label. S36/37 - Wear suitable protective clothing and gloves. S59 - Refer to manufacturer / supplier for information on recovery / recycling. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S16 - Keep away from sources of ignition. S7/9 - S2 - Keep out of the reach of children.
UN IDs	UN 2924 3/PG 2
WGK Germany	3
RTECS	VV3150000
FLUKA BRAND F CODES	3-10-19-21
TSCA	Yes
HS Code	29310095
Hazard Class	3
Packing Group	II
Toxicity	LD50 orally in Rabbit: 6056 mg/kg

(CH3)2SiCl2 - Upstream Downstream Industry

Raw Materials	Fumes, silica Copper(I) chloride Copper(I) chloride Chloromethane
Downstream Products	Octamethyl cyclotetrasiloxane 1,1,3,3,5,5-Hexamethyl-1,3,5-trisilacyclohexane

(CH3)2SiCl2 - Nature

Open Data Verified Data

colorless liquid, flammable, explosive. Boiling point 70.5 °c. Melting Point -76 °c. Relative density 1. 062; Refractive index 1. 4023; Flash point -8.9 °c. Soluble in benzene and ether. A complex mixture of dichloromethane and Siloxane is formed with water and hydrogen chloride is released.

Last Update：2024-01-02 23:10:35

(CH3)2SiCl2 - Preparation Method

Open Data Verified Data

methyl chloride and silicon powder in the presence of cuprous chloride catalyst in the next step of direct synthesis, the formation of methyl chlorosilane mixture, after distillation purification products dimethyl Dichlorosilane, and then vacuum distillation method of separation and purification.

Last Update：2022-01-01 10:54:14

(CH3)2SiCl2 - Use

Open Data Verified Data

This product is used in the manufacture of dimethyl silyl ether oil, silicone rubber and silicone resin.

Last Update：2022-01-01 10:54:13

(CH3)2SiCl2 - Safety

Open Data Verified Data

This product is highly toxic. It has a stimulating effect on the respiratory tract and skin. After long-term exposure, there are symptoms such as nasal mucosal atrophy or bronchitis. In addition, there are Head Pain, narcolepsy, weakness, chest pain and other symptoms. The LD50 for rodents was 300mg/kg. This product in water releases hydrogen chloride, but also irritant and corrosive, the operation should pay special attention. After touching the skin and eyes, rinse with plenty of water, the equipment should be sealed, and the operator should wear protective equipment.
packaged in iron drum or brown glass bottle. Store in a cool and ventilated place, waterproof, heat-proof, fire-proof. Hazardous materials shall be stored and transported according to regulations.

Last Update：2022-01-01 10:54:14

(CH3)2SiCl2 - Reference Information

NIST chemical information	information provided by: webbook.nist.gov (external link)
EPA chemical substance information	information provided by: ofmpeb.epa.gov (external link)
Application	dimethyldichlorosilane is the most widely produced monomer in the silicone industry, and its upstream raw materials are metal silicon and methyl chloride, downstream synthesis of organic silicon DMC, organic silicon D4 and other intermediates, and then used in the production of silicone rubber, silicone resin, silicone oil and other end products. methylchlorosilane is the main monomer for the synthesis of organosilicon polymers. Dimethyldichlorosilane is used to make silicone oil, silicone rubber and silicone resin; Methyldichlorosilane is used to make fabric moisture barrier and other organic monomers; Trimethylchlorosilane is used as the head of silicone oil, and methyltrichlorosilane is used as silicone resin. These products are widely used in moisture-proof electrical insulation materials, laminates, coatings, lubricants, building materials, etc. used as an intermediate in the production of silicone dimethyldichlorosilane is used as a monomer of a silicone resin and synthesis of an organosilicon compound, and it can also be used in the production of carbonized fibers with heat resistance and high strength.
preventive measures	1. Keep away from fire, heat source, open flame and hot surface; No smoking. Keep the container closed. 3. Grounding and connection of container and receiving equipment. 4. The use of explosion-proof electrical, lighting, ventilation facilities. 5. Use only tools that do not produce sparks. 6. Take measures to prevent static electricity. Wear protective gloves, glasses, and face masks. 8. Avoid inhalation of gas and vapor. Operate only outdoors or in well-ventilated places. After Operation, thoroughly clean the body contact parts. No food, water or smoking is allowed in the workplace. 10. Exclusion into the environment is prohibited.
production method	there are indirect and direct methods. The direct method is now used in industry and was invented by E.G. Rocho in the United States in 1940. In the production of copper or copper salt as catalyst, at about 300 ℃, the direct reaction of methyl chloride and silicon powder, which is a complex heterogeneous reaction, the reaction mixture mainly contains dimethyl dichlorosilane (75%), monomethyltrichlorosilane (20-30%), trimethylmonochlorosilane (5 %), and methyldichlorosilane; The boiling points of these components are 70 °c, 66.4 °c, 57.9 °c, and 41 °c, respectively, and are separated by an emulsifying column. The composition can be adjusted by changing the operating conditions as needed.
category	flammable liquid
toxicity grade	high toxicity
Acute toxicity	inhalation-rat LC50: 930 PPM/4 hours; Inhalation-mouse LC50:300 mg/m3/2 h
stimulation data	Skin-rabbits 20 mg/24 h moderate; eye-rabbit 5 mg/24 h severe
flammability hazard characteristics	in case of fire, high temperature, oxidant flammable; high heat or water decomposition of chloride poison fog
storage and transportation characteristics	The warehouse is ventilated and dried at low temperature; Stored separately from oxidants and acids
extinguishing agent	dry powder, dry sand, dry stone powder, carbon dioxide
spontaneous combustion temperature	425°C
toxic substance data	information provided by: pubchem.ncbi.nlm.nih.gov (external link)

Last Update：2024-09-26 09:04:26

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