Silicone – what is it? Silicones – a macromolecular organosilicon compounds. Silicone polymers have a structure as the main silicon-oxygen chains with organic side groups – methyl, ethyl, vinyl, etc., which are attached to the silicon atoms. By varying the length of the main chain, the type and quantity of side groups and cross-linking, was synthesized silicone rubber with a certain set of properties. Silicone rubber receive curing mixtures containing rubber, fillers – various kinds of silicon oxide, processing aids and other ingredients. In the process of vulcanization of silicone rubber containing fillers (various types of silicon dioxide), processing aids and other ingredients are obtained silicone rubber with different sets of often unique properties.
Vulcanizing agent in the vast majority of cases are organic peroxides. properties of silicone rubber Resistant to extreme temperature silicone rubber for a long time can be operated at temperatures ranging from -50 C to +180 C. Using special additives operating temperature can be raised to +200 +250 C. In addition, a heat-resistant types of silicone rubber, for operation at temperatures up to +300 C, while for operation at low temperatures – cold-resistant, that can be applied at temperatures down to -100 C. Table 1 Durability of silicone rubber at a constant temperature of thermal exposure ( C) Longevity -50 +100 Unlimited 120 10 20 years 150 5 10 years 2 200 260 5 years 3 months 2 year 310 1 Week 2 month 370 6:00 420 1 week 10 minutes 2:00 480 2 10 minutes Independence properties of temperature Most of the properties of silicone rubber – such as strength, elasticity, firmness, shape retention, hardness, toughness, and the limit elongation – depend on the temperature to a lesser extent than traditional rubbers.