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Description History Preparation Applications
Dichlorodimethylsilane structure
Chemical Name:
ls130;DMDCS;AW-DMCS;Inerton;SILANE M2;repel-silan;Sylon CTTM;(CH3)2SiCl2;inertondw-dmc;inertonaw-dmcs
Molecular Formula:
Formula Weight:
MOL File:

Dichlorodimethylsilane Properties

Melting point:
-76 °C
Boiling point:
70 °C(lit.)
1.333 g/mL at 20 °C
vapor pressure 
<200 hPa (20 °C)
refractive index 
n20/D 1.500
Flash point:
3 °F
storage temp. 
Store at 0-5°C
explosive limit
Water Solubility 
Moisture Sensitive
Stable. Reacts violently with water and alcohols. Highly flammable. Incompatible with strong oxidizing agents, water, alcohols, caustics, ammonia.
CAS DataBase Reference
75-78-5(CAS DataBase Reference)
NIST Chemistry Reference
Silane, dichlorodimethyl-(75-78-5)
EPA Substance Registry System
Silane, dichlorodimethyl-(75-78-5)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
  • NFPA
Hazard Codes  Xn,Xi,F,N,C
Risk Statements  20-59-36/37/38-11-67-65-63-48/20-38-20/21-50/53-37-35-20/22-14-34
Safety Statements  60-61-62-36/37-59-45-36/37/39-26-16-7/9-2
RIDADR  UN 2924 3/PG 2
WGK Germany  3
RTECS  VV3150000
Autoignition Temperature 425 °C
HazardClass  3
PackingGroup  II
HS Code  29310095
Hazardous Substances Data 75-78-5(Hazardous Substances Data)
Toxicity LD50 orally in Rabbit: 6056 mg/kg
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H225 Highly Flammable liquid and vapour Flammable liquids Category 2 Danger P210,P233, P240, P241, P242, P243,P280, P303+ P361+P353, P370+P378,P403+P235, P501
H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501
H304 May be fatal if swallowed and enters airways Aspiration hazard Category 1 Danger
H314 Causes severe skin burns and eye damage Skin corrosion/irritation Category 1A, B, C Danger P260,P264, P280, P301+P330+ P331,P303+P361+P353, P363, P304+P340,P310, P321, P305+ P351+P338, P405,P501
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
H331 Toxic if inhaled Acute toxicity,inhalation Category 3 Danger P261, P271, P304+P340, P311, P321,P403+P233, P405, P501
H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
H336 May cause drowsiness or dizziness Specific target organ toxicity,single exposure; Narcotic effects Category 3 Warning P261, P271, P304+P340, P312,P403+P233, P405, P501
H373 May cause damage to organs through prolonged or repeated exposure Specific target organ toxicity, repeated exposure Category 2 Warning P260, P314, P501
H410 Very toxic to aquatic life with long lasting effects Hazardous to the aquatic environment, long-term hazard Category 1 Warning P273, P391, P501
Precautionary statements:
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P310 Immediately call a POISON CENTER or doctor/physician.
P331 Do NOT induce vomiting.
P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P405 Store locked up.
P403+P233 Store in a well-ventilated place. Keep container tightly closed.

NFPA 704

Diamond Hazard Value Description
3 1
Health   3 Short exposure could cause serious temporary or moderate residual injury (e.g. liquid hydrogen, sulfuric acid, calcium hypochlorite, hexafluorosilicic acid)
Flammability   3 Liquids and solids (including finely divided suspended solids) that can be ignited under almost all ambient temperature conditions . Liquids having a flash point below 22.8 °C (73 °F) and having a boiling point at or above 37.8 °C (100 °F) or having a flash point between 22.8 and 37.8 °C (73 and 100 °F). (e.g. gasoline, acetone)
Instability   1 Normally stable, but can become unstable at elevated temperatures and pressures (e.g. propene)
Special   W

(NFPA, 2010)

Dichlorodimethylsilane price More Price(23)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 40136 Dichlorodimethylsilane Selectophore 75-78-5 1ml-f $35 2018-11-13 Buy
Sigma-Aldrich 40136 Dichlorodimethylsilane Selectophore 75-78-5 5ml-f $74.7 2018-11-13 Buy
TCI Chemical D0358 Dichlorodimethylsilane >98.0%(GC) 75-78-5 25mL $16 2018-11-22 Buy
TCI Chemical D0358 Dichlorodimethylsilane >98.0%(GC) 75-78-5 100mL $24 2018-11-22 Buy
Alfa Aesar L12133 Dichlorodimethylsilane, 99% 75-78-5 100g $36.2 2018-11-13 Buy

Dichlorodimethylsilane Chemical Properties,Uses,Production


Dichlorodimethylsilane is a tetrahedral, organosilicon compound with the molecular formula Si(CH3)2Cl2. The compound is a colorless liquid at room temperature, has a pungent odor and readily reacts with water to form both cyclic and linear Si-O chains. On an industrial scale, dichlorodimethylsilane is manufactured as the main precursor to polysilane and dimethylsilicone compounds.


James Crafts and Charles Friedel are American chemists who first reported organosilicon compounds in 1863 by synthesizing tetraethylsilane from silicon tetrachloride and diethylzinc. Nevertheless, major progress in organosilicon chemistry occurred when Fredrick Kipping and his students reacted tetrachloride with Grignard reagents to produce diorganodichlorosilanes (R2SiCl2), which they used for their experiments. The dpemand for silicones increased in the 1930s as many aircraft companies needed better insulators for sealing materials and electric motors for aircraft engines; therefore, there was need for efficient synthesis of dichlorodimethylsilane.


Dichlorodimethylsilane is prepared by passing methyl chloride through a heated tube packed with copper (I) chloride and ground silicon using Cu2O as the catalyst. Methyl chloride is the passed through a reactor to produce dichlorodimethylsilane.
2 CH3Cl + Si → (CH3)2SiCl2
The other products in this reaction apart from dichlorodimethylsilane include CH3)3SiCl, CH3SiHCl2, and CH3SiCl3, which can be separated fromone another by fractional distillation.


Dichlorodimethylsilane is majorly used in the production of silicones. Moreover, it is utilized in the synthesis of polysilanes, which are the main precursors to silicon carbide. Dichlorodimethylsilane can be used to coat glass to prevent the adsorption of micro-particles.

Chemical Properties

Colorless to brown liquid


Dichlorodimethylsilicon is a organosilicon compound and is the precursor to dimethylsilicone and polysilane compounds.

General Description

A colorless fuming liquid with a pungent odor. Flash point 16°F. Vapor and liquid may cause burns. Denser than water. Vapors heavier than air.

Reactivity Profile

Chlorosilanes, such as Dichlorodimethylsilane, are compounds in which silicon is bonded to from one to four chlorine atoms with other bonds to hydrogen and/or alkyl groups. Chlorosilanes react with water, moist air, or steam to produce heat and toxic, corrosive fumes of hydrogen chloride. They may also produce flammable gaseous H2. They can serve as chlorination agents. Chlorosilanes react vigorously with both organic and inorganic acids and with bases to generate toxic or flammable gases.

Health Hazard

Inhalation irritates mucous membranes. Severe gastrointestinal damage may occur. Vapors cause severe eye and lung injury. Upon short contact, second and third degree burns may occur.

Fire Hazard

Vapor may explode if ignited in an enclosed area. Reacts vigorously with water to generate hydrogen chloride. Hydrogen chloride and phosgene gases may be formed upon heating or in fire. Runoff to sewer may create fire or explosion hazard.

Safety Profile

Poison by ingestion and intraperitoneal routes. Moderately toxic by inhalation. A skin and severe eye irritant. Violent reaction on contact with water. When heated to decomposition it emits toxic fumes of Cl-. See also CHLOROSILANES.

Purification Methods

Other impurities are chlorinated silanes and methylsilanes. Fractionate it through a 3/8in diameter 7ft Stedman column (p 11) rated at 100 theoretical plates at almost total reflux. See purification of MeSiCl2. Solutions in heptane, 1,1,1-trichloroethane or 1-chloronaphthalene are used for the silanization of glassware and pipettes. [Sauer & Hadsell J Am Chem Soc 70 3590 1948, Beilstein 4 IV 4110.]

Dichlorodimethylsilane Preparation Products And Raw materials

Raw materials

Preparation Products

Dichlorodimethylsilane Suppliers

Global( 213)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Hangzhou Bayee Chemical Co., Ltd.
0086-571-86990109; 0086-18605816692
0086-571-85775919 China 98 55
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 21910 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20680 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32457 55
+86 21 5161 9050/ 5187 7795
+86 21 5161 9052/ 5187 7796 CHINA 24196 60
+86-571-8723 8903
+86-571-87063838 CHINA 998 58
Shanghai Worldyang Chemical Co.,Ltd.
0086-21-56795779 CHINA 81 58
career henan chemical co
+86-371-86658258 CHINA 20642 58
Chemwill Asia Co.,Ltd.
86-21-51861608;;; CHINA 23982 58
Hubei Jusheng Technology Co.,Ltd.
86-188-71490254 CHINA 20094 58

View Lastest Price from Dichlorodimethylsilane manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-12-17 Dichlorodimethylsilane
US $1.00 / kg 1kg 99% 100KG career henan chemical co

Dichlorodimethylsilane Spectrum

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