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Glossary » Materials » Polymers » Silicone » Flexible Casting Resins (including RTV)

Flexible Casting Resins (including RTV) SI is a subcategory of Silicone. It is specially formulated to flexible casting resins (including RTV). Its tensile strength ranges from 350 to 1000 MPa at break. Its elongation at break ranges from 20 to 700 %. Its hardness ranges from 10 to 70 Shore A. Its specific gravity ranges from 0.97 to 2.5. Its coefficient of thermal expansion ranges from 10 to 19 x 10^-6/°C.

Silicone, also known as SI, is a thermoset polycondensate. Common trade names include Baysilon, Blu-Sil, Commex, Fiberite, Lamitex, Siltemp, and Textolite. It maintains its dimensional stability and good electrical and dielectrical properties over a wide range of frequency and temperature. Other useful properties include good flame resistance, low water absorption, moderate thermal shock resistance, and average polymeric mechanical properties. On the other hand, it is high-cost with limited shelf-life and a long curing time. It is often used in computer chips, IC’s, cooking ware, and food containers.