Chemistry informtion about Butyltrichlorosilane (CAS NO.7521-80-4) is:
IUPAC Name: Butyl(Trichloro)Silane
Synonyms: Butyltrichloro-Silan ; Silane, Butyltrichloro- ; Trichlorobutylsilane ; Butyl Silicontrichloride ; Butyltrichlorosilane ; Trichloro-N-Butylsilane ; N-Butyltrichlorosilane ; N-Butyltrichlorosilane, 97+%
Product Categories: Silane Coupling Agents (Intermediates) ; Functional Materials ; Si (Classes of Silicon Compounds) ; Si-Cl Compounds ; Silane Coupling Agents ; Trichlorosilanes ; SilanesProtection and Derivatization ; Protecting and Derivatizing Reagents ; Silicon-Based ; Solution Deposition Precursors ; Materials for Surface ModificationSilsesquioxanes: POSS? Nanohybrids ; RSiCl3Self Assembly&Contact Printing ; Organic Electronics and Photonics ; POSS? Precursors and Intermediates ; Self-Assembly Materials ; Silanes ; Substrates and Electrode Materials 
MF: C₄H₉Cl₃Si
MW: 191.56
EINECS: 231-381-3 
Density: 1.164 g/cm³
Flash Point: 45.6 °C
Boiling Point: 147.7 °C at 760 mmHg
Vapour Pressure: 5.53 mmHg at 25°C 
Enthalpy of Vaporization: 36.88 kJ/mol
Refractive Index: n20/D 1.437(lit.)
Sensitive: Moisture Sensitive
BRN: 1736032
Following is the molecular structure of Butyltrichlorosilane (CAS NO.7521-80-4) is:

Butyltrichlorosilane (CAS NO.7521-80-4) can be used to make various silicon containing compounds.

Reported in EPA TSCA Inventory.

A corrosive poison. See also CHLOROSILANES. Flammable liquid when exposed to heat, flame (sparks), or oxidizers. To fight fire, use water to blanket fire, fog, mist, dry chemical, alcohol foam. Reacts with water or steam to produce heat and toxic and corrosive fumes. When heated to decomposition it emits highly toxic fumes of Cl⁻. 
Hazard Codes:
C
Risk Statements:
R10:Flammable. 
R14 :Reacts violently with water. 
R34:Causes burns.
Safety Statements:
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
RIDADR: UN 1747 8/PG 2
WGK Germany: 1
RTECS: VV2080000
F:
F 10: Keep under argon.
F 21: Sensitive to humidity.
TSCA: Yes
HazardClass: 8
PackingGroup: II

DOT Classification:  8; Label: Corrosive

Butyltrichlorosilane (CAS NO.7521-80-4) is a colorless liquid with a pungent odor. It is corrosive to metals and skin. It reacts with water, moist air, or steam to produce heat and toxic, corrosive fumes of hydrogen chloride and flammable butane. Can serve as a chlorination agent. Reacts vigorously with both organic and inorganic acids and with bases to generate toxic or flammable gases. Reacts with alcohols, acetone and light metals. Inhalation of vapor irritates upper respiratory system. Contact of liquid with eyes or skin causes severe burns. Ingestion causes burns of mouth and stomach.