Dichlorodimethylsilane

Dichlorodimethylsilane

Silane,dichlorodimethyl-;Dichlorodimethylsilane;Dimethyldichlorosilane;Inerton AW-DMCS;Dichlorodimethylsilicon;Dimethylsilane dichloride;Repel-Silane;LS 130;M 2 (silane);M 2;KA 22;NSC 77070;LS 130 (silane);DCDMS;KA 12;SID 4120.0;TSL 8032

75-78-5

C2H6Cl2Si

InChIKey=LIKFHECYJZWXFJ-UHFFFAOYSA-N

129.061

129.06

200-901-0

8TSJ92JX69

0870

77070

1162

DTXSID9026425

Colorless liquid

29310095

Silane Reagent

0

3.18

Dimethyldichlorosilane appears as 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.

1.07 g/cm³

<-70 °C

70.5 °C

-16.1±0.0 °C

1.410

reacts

Dimethyldichlorosilane must be stored to avoid contact with oxidizers (such as perchlorates, peroxides, permanganates, chlorates, and nitrates) since violent reactions occur. Before entering confined space where this chemical may be present, check to make sure that an explosive concentration does not exist. Store in tightly closed containers in a cool, well-ventilated area away from water, steam, or moisture because toxic and corrosive hydrogen chloride gas can be produced. Do not store at tempe

<200 hPa (20 °C)

Relative vapour density (air = 1): 4.4

LD50 orally in Rabbit: 6056 mg/kg

Lower flammable limit: 3.4%; Upper flammable limit: 9.5%

Explosive limits , vol% in air: 1.4-9.5

SHARP, LIKE HYDROCHLORIC ACID

Henry's Law constant = 1.8X10-2 atm-cu m/mol at 25 °C (est)

Reacts with water to form complex mixture of dimethylsiloxanes, and liberates hydrogen chloride.|Freezing point: -86 °C|Organo-functional silanes are noted for their ability to bond organic polymer systems to inorganic substrates. /Silane cmpd/|The reaction of organosilanes with halogens and halogen cmpd usually proceeds in good yield through cleavage of the Si--H bond and formation of the silicon-halogen bond. Reaction with fluorine, however, does not proceed satisfactorily because of cleavage of not only the Si--H but also C--Si and C--H bonds. Direct halogenation with chlorination, bromine, and iodine proceeds smoothly, however. /Organosilanes/|Hydroxyl radical reaction rate constant = 2.9X10-13 cu cm/molec-sec at 25 °C (est)

Highly flammable. Fumes in air. May react violently with water (moisture in air or soil) to generate hydrogen chloride, Title 46(1966). Dimethyldichlorosilane reacts vigorously with water to generate gaseous HCl. Based on a scenario where the chemical is spilled into an excess of water (at least 5 fold excess of water), half of the maximum theoretical yield of Hydrogen Chloride gas will be created in 0.75 minutes. Experimental details are in the following: "Development of the Table of Initial Isolation and Protective Distances for the 2008 Emergency Response Guidebook", ANL/DIS-09-2, D.F. Brown, H.M. Hartmann, W.A. Freeman, and W.D. Haney, Argonne National Laboratory, Argonne, Illinois, June 2009.

Chlorosilanes

Highly Flammable

Chlorosilanes, such as DIMETHYLDICHLOROSILANE, 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.

750 °F (USCG, 1999)|716 °F (380 °C)|380 °C

Lower flammable limit: 3.4%; Upper flammable limit: 9.5%

The vapour is heavier than air and may travel along the ground; distant ignition possible.

Corrosive

100 BTU/LB = 58 CAL/G = 2.4X10+5 JOULE/KG