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Hexamethylcyclotrisiloxane (D3)

Chemical Name:Hexamethylcyclotrisiloxane
Product Category:Silicone IntermediateProduct
Structural Formula:541-05-9
CAS No.:541-05-9
Molecular Formula:C6H18O3Si3
Molecular Weight:222.46

Hexamethylcyclotrisiloxane Description

Hexamethylcyclotrisiloxane molecular formula C6H18O3Si3, is a white crystal, melting point 75 ℃, shrinkage rate of 0.6-0.8%, mainly used for silicone rubber shrinkage treatment. Alias also known as: D3, hexamethylcyclotrisiloxane, hexamethylcyclotrisiloxane (D3), cyclotrimethylsiloxane, hexamethylcyclotrisiloxane. D3 silicone intermediates are not only used to synthesize general silicone polymers, but also can be used to prepare specific silicone compounds, as a variety of surface treatment agents, coupling agents, cross-linking agents.
Melting point50-64 °C(lit.)
Boiling point134 °C(lit.)
Vapor Density1 (vs air)
Flash point95°F
Storage conditionsFlammables area
Water solubilitymay decompose
SensitivityMoisture Sensitive Moisture Resistant Water Resistant
StabilityStable, but moisture sensitive. Incompatible with strong oxidizing agents.
Propertieswhite crystal, melting point 75°C, shrinkage rate 0.6-0.8%, used for silicone rubber shrinkage treatment
UsesIn addition to synthesizing general organosilicon polymers, it can also be used to prepare specific organosilicon compounds as various surface treatment agents, coupling agents, cross-linking agents, etc.
  • ES(TSCA)
Transportation & Safety info
  • UN No.: UN 1325
  • Transport hazard class(es) :  4.1
  • Packing group: II
  • Packed in plastic barrels lined with plastic bags, net weight 50kg/drum; or Packed in iron drum lined with plastic bag, net weight 125kg/drum.
  • Provided for free
Inventory items
  • 18 tons.

Packaging Specifications

Packaging Specifications
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Hexamethylcyclotrisiloxane: Guide

Hexamethylcyclotrisiloxane is used in the manufacture of methyl vinyl silicone rubber products and is also an important raw material for the synthesis of other polymer compounds.

In trace amounts of sodium silanolate, potassium silanolate or a small amount of concentrated sulfuric acid, hexamethylcyclotrisiloxane within the Si-O-Si bond breakage rearrangement, the generation of straight-chain polysiloxanes and cyclic siloxane mixture. This catalytic fracture rearrangement process has an equilibrium character, and macromolecular chain-breaking degradation occurs at the same time as the ring-opening polymerization of the ring body into a high molecular weight polymer. Reaction with excess sodium hydroxide methanol solution produces sodium dimethylsilanediol. It can be produced by high-temperature cracking of the hydrolyzed material of dimethyldichlorosilane with KOH. Dimethicones and silicone rubbers are usually prepared in the form of mixed cyclic bodies (containing hexamethylcyclotrisiloxane).
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