Gelest Silicone Fluids - Gelest Inc.
Gelest Silicone Fluids - Gelest Inc.
Gelest Silicone Fluids - Gelest Inc.
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<strong>Gelest</strong>, <strong>Inc</strong>.<br />
Low Volatility<br />
PolyDimethylsiloxanes<br />
Volatile, low molecular weight components are present in<br />
polydimethylsiloxanes as a consequence of the equilibrium<br />
polymerization utilized in their manufacture. Typically, silicones<br />
with viscosities below 50 cSt. have >10% volatiles,<br />
while those with viscosities greater than 50 cSt. have 0.5-4.0%<br />
volatiles. Low molecular weight components can impart undesirable<br />
effects in certain critical applications. These include<br />
outgassing, migration and, in contact with certain plastics and<br />
rubbers, bleed, plasticization and stress-cracking.<br />
Devolatilized silicones are offered in two classes. Reduced<br />
Volatility <strong>Silicone</strong>s have >90% low-molecular weight components<br />
removed and are generally acceptable for polymer contacting<br />
applications. Extreme Low Volatility <strong>Silicone</strong>s have virtually<br />
zero volatiles and are suitable for extreme vacuum<br />
applications including systems deployed in space exploration<br />
and communication. An example of a space application is as<br />
a damping fluid for solar panels.<br />
Volatile Cyclic<br />
PolyDimethylsiloxanes -<br />
Cyclomethicones<br />
Low molecular weight silicone that possess a cyclic structure<br />
rather than a chain structure serve as volatile carriers for a<br />
variety of formulations. Low heats of vaporization and the<br />
ability to select a desired vapor pressure has led to their use<br />
as cosmetic vehicles. While most display a broad range of<br />
liquid behavior, the most volatile cyclic dimethylsiloxane, D3,<br />
is a solid at room temperature.<br />
Reduced Volatility PolyDimethylsiloxanes<br />
% volatiles measured after 24 hours at 125°C in air<br />
Product Code Viscosity % Volatiles Price/1kg<br />
DMS-T07R 7 8 $120.00<br />
DMS-T12R 20 0.5 $110.00<br />
DMS-T21R 100 0.05 $110.00<br />
Extreme Low Volatility PolyDimethylsiloxanes<br />