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Trichlorosilane CAS#：10025-78-2

• CAS Number: 10025-78-2

• Chemical Formula: Cl3HSi

• Synonyms:

▪ silicon chloroform

▪ trichlorosilane pressure tin

▪ Trichlorosilane,98%

• Appearance: Colorless liquid

• HS Code: 283530090

• MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)

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Product Details

Products Description of Trichlorosilane CAS#：10025-78-2

Under room temperature and pressure, trichlorosilane is a colorless, volatile liquid with a pungent odor. It flows easily and is highly flammable in air—even at temperatures below -18°C, it still poses a fire risk. When it comes into contact with an open flame, it burns intensely, producing red flames and white smoke, and generates silicon dioxide (SiO₂), hydrogen chloride (HCl), and chlorine gas (Cl₂). The chemical reaction is as follows: SiHCl₃ + O₂ → SiO₂ + HCl + Cl₂.

Vapors of trichlorosilane can mix with air to form explosive gas mixtures across a wide range of concentrations, and intense explosions may occur when heated. Its thermal stability is better than that of dichlorosilane; at 900°C, it decomposes into toxic fumes including hydrogen chloride (HCl), chlorine gas (Cl₂), and silicon (Si).

When exposed to moisture, it produces fumes and reacts violently with water. The reaction equation is: 2SiHCl₃ + 3H₂O → (HSiO)₂O + 6HCl. It decomposes in alkaline solutions and releases hydrogen gas, following the reaction: SiHCl₃ + 3NaOH + H₂O → Si(OH)₄ + 3NaCl + H₂. Contact with oxidizing substances can trigger explosive reactions.

It reacts with acetylene, hydrocarbons, and other organic hydrocarbons to produce chlorosilanes. For example: SiHCl₃ + CH≡CH → CH₂CHSiCl₃ and SiHCl₃ + CH₂=CH₂ → CH₃CH₂SiCl₃. In the presence of lithium aluminum hydride or lithium borohydride, trichlorosilane can be reduced to silane.

If the container holding it is subjected to strong impact, liquid trichlorosilane will ignite. It is soluble in solvents such as benzene and ether. Anhydrous trichlorosilane does not corrode iron or stainless steel, but when moisture is present, it can corrode most metals.

Trichlorosilane Chemical Properties
Melting point	-127 °C
Boiling point	32-34 °C(lit.)
density	1.342 g/mL at 25 °C(lit.)
vapor density	1 (vs air)
vapor pressure	9.75 psi ( 20 °C)
refractive index	1.4-1.402
Fp	7 °F
storage temp.	Refrigerator
solubility	Soluble in benzene, ether, heptane, chloroform and carbon tetrachloride.
form	Liquid
Specific Gravity	1.342
color	Colorless
Odor	Sharp, choking, like hydrochloric acid.
explosive limit	70%
Water Solubility	decomposes
Sensitive	Air & Moisture Sensitive
Hydrolytic Sensitivity	8: reacts rapidly with moisture, water, protic solvents
Merck	14,9646
Stability:	Stable, but extremely flammable. Pyrophoric - spontaneously ignites in air. Explosion hazard in air - note wide explosion limits. Reacts violently with water. Incompatible with moisture, acids, bases, strong oxidizing agents, alcohols, amines.
InChIKey	ZDHXKXAHOVTTAH-UHFFFAOYSA-N
CAS DataBase Reference	10025-78-2(CAS DataBase Reference)
NIST Chemistry Reference	Trichlorosilane(10025-78-2)
EPA Substance Registry System	Trichlorosilane (10025-78-2)

Safety Information

Hazard Codes	F+,C
Risk Statements	12-14-17-20/22-29-35
Safety Statements	16-26-36/37/39-43-45-7/9-43A
RIDADR	UN 1295 4.3/PG 1
WGK Germany	1
RTECS	VV5950000
F	4.5-21-31
TSCA	Yes
HazardClass	4.3
PackingGroup	I
HS Code	28530090
Hazardous Substances Data	10025-78-2(Hazardous Substances Data)
Toxicity	LD50 orally in rats: 1.03 g/kg (Smyth)