Octadecyltrichlorosilane cas no:112-04-9

Hazard C:Corrosive;
Risk R14;R29;R34
Safety

Combustible material: may burn but does not ignite readily. Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff. When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion hazards. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapors may travel to source of ignition and flash back. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water.
Safety Information of Octadecyltrichlorosilane (112-04-9):
Hazard Codes: C
Risk Statements: 14-34-29
14:  Reacts violently with water
29:  Contact with water liberates toxic gas
34:  Causes burns
Safety Statements: 26-36/37/39-43-45-8
8:  Keep container dry
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
36:  Wear suitable protective clothing 
37:  Wear suitable gloves  
39:  Wear eye/face protection 
43:  In case of fire, use ... (indicate in the space the precise type of fire-fighting equipment. If water increases the risk add - Never use water) 
45:  In case of accident or if you feel unwell, seek medical advice immediately (show label where possible)

TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or death. Contact with molten substance may cause severe burns to skin and eyes. Reaction with water or moist air will release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.