Polydimethylsiloxane, dihydroxy terminated Chemical Properties

Melting point:

<-60°C

Boiling point:

182 °C

Density 

0.98 g/mL at 25 °C

refractive index 

n20/D 1.406

Flash point:

155 °F

storage temp. 

2-8°C

form 

Liquid

Specific Gravity

0.97

Water Solubility 

Soluble in carbon tetrachloride, benzene, chloroform, diethyl ether, toluene and other organic solvents. Insoluble in water and ethanol.

InChI

InChI=1S/HOSi/c1-2/h1H

InChIKey

XQSFXFQDJCDXDT-UHFFFAOYSA-N

SMILES

[Si]O[H]

EPA Substance Registry System

Hydroxy-terminated dimethyl siloxanes and silicones (70131-67-8)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

23-24/25-36-26

WGK Germany 

1

RTECS 

VW3157812

TSCA 

Yes

Polydimethylsiloxane, dihydroxy terminated Usage And Synthesis

Description

Polydimethylsiloxane, dihydroxy terminated is a non-toxic, optically transparent, inert, flammable silicone-based organic polymer. It is widely used in heat-resistant lubricants, flame retardants, medical devices, and cosmetics. Polydimethylsiloxane is hydrophobic, cytocompatible and viscoelastic and can be used for water-repellent coatings in the textile industry.

Chemical Properties

Silanol Terminated Polydimethylsiloxane is a silicon-basedorganic polymer that is nontoxic, optically clear, inert, and inflammablematerial. It is widely used in heat-resistant lubricants, fire retardants,medical devices, and cosmetics. Polydimethylsiloxane is hydrophobic,cytocompatible, and viscoelastic which can be used to prepare water-repellentcoatings in the textile industry.

Uses

Polydimethylsiloxane is frequently used in a liquid containing 4-5% silica gel, emulsifiers and preservatives. It is employed in applications like contact lenses, medical devices, elastomers, in shampoos, food (antifoaming agent), caulking, lubricants, kinetic sand , and heat-resistant tiles. PDMS is a common surfactant, component of defoamers and as an herbicidal penetran.

Solubility in organics

THF, toluene, Insoluble in water

Toxics Screening Level

The initial threshold screening level (ITSL) for hydroxyl-terminated dimethyl siloxanes and siliconesremains at 0.1 μg/m3 based on an annual averaging time.

Polydimethylsiloxane, dihydroxy terminated(70131-67-8)Related Product Information

• Cupric acetylacetonate
• Aluminum acetylacetonate
• 2,4-PENTANEDIONE, SILVER DERIVATIVE
• TRIS(2,2,6,6-TETRAMETHYL-3,5-HEPTANEDIONATO)EUROPIUM(III)
• PHENYLSELENOL
• N-BUTYLISOCYANIDE
• DICHLORO(ETHYLENEDIAMINE)PLATINUM(II)
• Ethyl isocyanoacetate
• TERT-BUTYL ISOCYANIDE
• Tris(2,4-pentanedionato)chroMiuM(III)
• METHYL ISOCYANOACETATE
• COBALT(II) ACETYLACETONATE
• SALCOMINE
• Benzyl isocyanide
• Ferric acetylacetonate
• 1,1,3,3-TETRAMETHYLBUTYL ISOCYANIDE
• Tosylmethyl isocyanide
• POLY(DIMETHYLSILOXANE), HYDROXY TERMINATED