What is D4 octamethylcyclotetrasiloxane?

What is D4 octamethylcyclotetrasiloxane?

Octamethylcyclotetrasiloxane (D4; CAS No. 556-67-2) is used as a monomer in the manufacture of polymeric materials, which are widely used in various industrial and/or medical applications, such as breast implants.

What is Cyclotetrasiloxane Octamethyl?

Octamethylcyclotetrasiloxane is a cyclosiloxane that is the octamethyl derivative of cyclotetrasiloxane. It is an organosilicon compound and a cyclosiloxane. It derives from a hydride of a cyclotetrasiloxane. ChEBI.

What is D4 silicone?

D4 is an odourless, colourless liquid mostly used as an intermediate or basic raw material in the production of silicone rubbers, gels and resins. When used as an intermediate during the manufacturing process, virtually all D4 is consumed with only a tiny amount remaining in final products.

Is octamethylcyclotetrasiloxane volatile?

Octamethylcyclotetrasiloxane (D4) is a volatile cyclic siloxane used primarily as a monomer or intermediate in the production of some silicon-based polymers widely used in industrial and consumer applications and may be present as a residual impurity in a variety of consumer products.

How is octamethylcyclotetrasiloxane made?

Production and polymerization Commercially D4 is produced from dimethyldichlorosilane. Hydrolysis of the dichloride produces a mixture of cyclic dimethylsiloxanes and polydimethylsiloxane. From this mixture, the cyclic siloxanes including D4 can be removed by distillation.

What is siloxane polymer?

Siloxanes are polymeric organic silicones that comprise a backbone of alternating silicon-oxygen [Si-O] units with organic side chains attached to each silicon atom.

What is D4 and D5?

D4 and D5 are cyclosiloxanes mainly used as monomers for silicone polymer production. They also have a direct use in personal care products. D4 has been identified as a persistent, bioaccumulative and toxic (PBT) and very persistent very bioaccumulative (vPvB) substance. D5 has been identified as a vPvB substance.

Is octamethylcyclotetrasiloxane soluble?

Octamethylcyclotetrasiloxane, also called D4, is an organosilicon compound with the formula [(CH3)2SiO]4. It is a colorless viscous liquid….Octamethylcyclotetrasiloxane.

Solubility in water 56.2±2.5 ppb (23 °C)
log P 6.98±0.13
Vapor pressure 124.5±6.2 Pa (25 °C)

What are silicones general formula?

A general formula for silicones is (R2SiO)x, where R can be any one of a variety of organic groups. Read More on This Topic. major industrial polymers: Polysiloxanes (silicones) Polysiloxanes are polymers whose backbones consist of alternating atoms of silicon and oxygen.

What are siloxanes and silicones?

Siloxanes are commonly known as silicones. They belong to the organosilicon compounds and are exclusively obtained by synthesis. Their chemical structure determines a range of physicochemical properties which were recognized as unique.

What is regulation D4?

The EU Commission acted to restrict the use of silicones octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) in wash-off personal care products in January. Per Regulation (EU) 2018/35, wash-off cosmetic products must not contain a concentration of D4 or D5 higher than 0.1%.

Is cyclomethicone a D5?

D5 can be added as an ingredient in silicone mixtures used in cosmetic applications such as skin creams and deodorants, where it may be labelled “cyclomethicone” or “cyclopentasiloxane”.