Tetrapropoxysilane Chemical Properties

Melting point:

<-80°C

Boiling point:

94 °C5 mm Hg(lit.)

Density 

0.916 g/mL at 25 °C(lit.)

vapor density 

>1 (vs air)

vapor pressure 

0.26Pa at 25℃

refractive index 

n20/D 1.4(lit.)

Flash point:

203 °F

storage temp. 

Inert atmosphere,Room Temperature

form 

liquid

Specific Gravity

0.916

color 

Colorless to Almost colorless

Water Solubility 

78mg/L at 20℃

Sensitive 

Moisture Sensitive

Hydrolytic Sensitivity

7: reacts slowly with moisture/water

BRN 

1706115

InChIKey

ZQZCOBSUOFHDEE-UHFFFAOYSA-N

LogP

3.4 at 20℃

CAS DataBase Reference

682-01-9(CAS DataBase Reference)

NIST Chemistry Reference

Tetrapropyl silicate(682-01-9)

EPA Substance Registry System

Silicic acid (H4SiO4), tetrapropyl ester (682-01-9)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36-37/39

RIDADR 

1993

WGK Germany 

3

F 

10-21

TSCA 

Yes

HazardClass 

8

PackingGroup 

III

HS Code 

29209090

MSDS

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Tetrapropoxysilane Usage And Synthesis

Introduction

Tetrapropoxysilane (TPOS), [also called n-Propyl Silicate] is used as a cross-linking agent for silicon rubber, and as a modifying agent for organic and inorganic resins. The ethyl group of ethyl silicate is replaced by the N-propyl group, so the speed of hydrolysis is slower than ethyl silicate.

Applications

• As an inorganic binder for refractory fillers and pigments, like precision investment castings.
• As a second backup casting coating. It cures faster than colloidal silica system.
• May be hydrolyzed to form silicon dioxide (silica).
• As a binder in zinc-rich (corrosion resistant) coating.
• As a starting material for sol-gel process.
• As a crosslinking agent for silicone sealant.
• As a drying agent in sealing compositions.
• As a chemical intermediate.

Chemical Properties

Colorless transparent liquid

Flammability and Explosibility

Non flammable

Tetrapropoxysilane(682-01-9)Related Product Information

• Tetraethyl orthosilicate
• Methyltriethoxysilane
• Triethoxysilane
• Trimethoxysilane
• Propyl acetate
• Phenyltriethoxysilane
• Tetramethyl orthosilicate
• Vinyltrimethoxysilane
• Triethoxyvinylsilane
• Dimethyldimethoxysilane
• SILICON TETRAACETATE
• 3-Aminopropyltriethoxysilane
• Methyltris(methylethylketoxime)silane
• Vinyltris(methylethylketoxime)silane
• Tetramethylsilane
• Tetrapropylammonium bromide
• Tetrapropyl ammonium chloride
• Tetraphenylmethane