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September 12, 2013 12:00 AM

Master Bond launches flame-retardant two-part silicone potter

ERJ Staff
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    ERJ staff report (BC)

    Hackensack, New Jersey – Master Bond is offering a thermally conductive two-part silicone system that meets the Underwriters Laboratory (UL) 94V-0 specification for flame retardancy. Mastersil 156 is formulated for potting, encapsulation and sealing applications.

    Mastersil 156 is a "competent" electrical insulator, says the company, with a low viscosity that can cure in sections beyond 25-50mm thick. It is thermally conductive and is temperature rated to 105°C by UL in thicknesses up to 10mm and above [sic].

    The two-component, addition-cured silicone system is claimed to bond well to a variety of substrates, including metals, composites, glass, ceramics and many rubbers and plastics.

    It is available in standard packaging options ranging from half-pint to five-gallon container kits. The silicone has a six-month shelf life at room temperature when stored in original, unopened containers.

    The company cites the following key benefits for Mastersil 156:

    • 1:1 mix ratio by weight, with no outgassng while curing

    • Complete cross linking without exposure to air

    • Flexibility sufficient to withstand aggressive thermal cycling and resist vibration and shock

    • High resistance to water, humidity, oils and other environmental elements

    • Very low shrinkage upon cure due to 100 per cent solid phase with no solvents

    • Good flow and electrical insulation properties.

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