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

Appearance

Colorless to light yellow Liquid

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

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