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Octamethylcyclotetrasiloxane (D4)

Chemical Name:Octamethyl cyclotetrasiloxane
Product Category:Silicone IntermediateProduct
Structural Formula:556-67-2
CAS No.:556-67-2
Molecular Formula:C8H24O4Si4
Molecular Weight:296


Octamethyl cyclotetrasiloxane (D4) is a flammable, odorless, colorless, transparent or milky white liquid, obtained by separation and rectification on the basis of the product obtained through the hydrolysis synthesis process of dimethyldichlorosilane compound of. It is an important intermediate in the silicone industry.

The main uses of Octamethyl cyclotetrasiloxane include the preparation of silicone polymers such as methyl silicone oil, the insulation and moisture resistance of radio parts, and the surface deactivation agent for gas chromatography glass capillary columns.
Equivalent Product NameNA
AliasOctamethyl cyclotetrasilazane; octaphenyl silsesquioxane; Octamethylcyclotetrasiloxane;
Relative density0.9558
Melting point17~18℃
Boiling point175~176℃
Refractive index(n20D) 1.3968
Flash point60°C
PropertiesColorless oily liquid.
SensitivitySensitive to moisture.
Water SolubilityMiscible with organic solvents, insoluble in water.
UsesThe primary form of dimethylcyclosiloxane is mainly used for ring-opening polymerization to form silicone oil, silicone rubber and silicone resin with different degrees of polymerization.These polymers are further processed into products that are widely used in various fields such as construction, electronics, textiles, automobiles, personal care, food, and mechanical processing, and there are also a small amount of direct applications.
  • YES
Transportation & Safety info
  • UN No.: UN 1993
  • Transport hazard class(es) :  3
  • Packing group: III
  • Our standard packing is net 25kg / 200 kg drums / 1000kg/IBC,or according to your requirements.
  • Provided for free
Inventory items
  • 6 tons.

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Octamethylcyclotetrasiloxane : Guide

Octamethylcyclotetrasiloxane, abbreviated as D4, is the basic raw material of silicone oil (modified silicone oil), silicone emulsion, silicone rubber, silicone resin and other silicone products, but also can be directly used as a rubber filler treatment agent and cosmetic raw materials.

D4 is mainly used as a raw material for silicone, also used in the electronics industry for the manufacture of high tear-resistant silicone rubber products, also used in the synthesis of other polymer compounds octamethylcyclotetrasiloxane can be used as an intermediate in the preparation of silicone oils, but also used in the radio parts of the insulation, moisture and so on.

Octamethylcyclotetrasiloxane miscible in organic solvents, soluble in carbon tetrachloride, almost insoluble in water. Melting point 17-18℃. Boiling point 175-176℃/760mmHg. density ρ(20)0.956-0.959g/mL. refractive index n20/D1.395-1.398. flash point 131℉/55℃.
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