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Octamethylcyclotetrasiloxane RJ-D4

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Chemical Name: Octamethylcyclotetrasiloxane D4 Siloxane, D4 Silicone

CAS No.:556-67-2

Structural formula: [(CH3)2SiO]4

Molecular weigh: 296.62

Structural formula:

Chemical Structure of D4.png

Technical Index

Boiling point, °C175
Flash point, °C56
Melting point,°C17.5
Density at 20 °C, g/cm30.95
Viscosity(at 25°C,,mm2/s)2.3
Purity, (D4) ,%min.99.0


Octamethylcyclotetrasiloxane RJ-D4 is used in the production of silicone high polymer from ring-opening reaction under catalyzing of acid or alkali, which is a basic material of silicone oil and silicone rubber and is also can be directly used in rubber filler treatment or a raw material for cosmetics.


D4 Siloxane is available in 190 KGS Iron Drum, 950kg IBC Drum or other packing on request. 

Transport informations

Caution During Transportation: UN NO: 1993, Hazard Class:3, Packing Group:Ⅲ

Keep container tightly closed and store in a cool, well ventilated place.


D4 has low flush point and it is flammable, keep it away from heat, open flames and other sources of ignition. Prevent from the exposure of moisture, acid, alkalis and other impurities.

Shelf life

Original characteristics remain intact for 1 years, if kept in recommended storage.