Mold silica gel is generally composed of five components: base glue, crosslinking agent, catalyst, filler and additives, usually the base glue, crosslinker and filler are made into one component, and the catalyst is a single component, so mold silica gel is also called two-component vulcanized silica gel, RTV-2 room temperature vulcanized silica gel. What are the properties of mold silicone, the following macro silicone will tell you about it:
Heat resistance: Mold silicone has much better heat resistance than ordinary rubber, and can be used almost forever at 150 degrees without performance change;It can be used continuously for 10,000 hours at 200 degrees;It can also be used for a period of time at 350 degrees. Widely used in the occasion that requires heat resistance: hot water bottle sealing ring, pressure cooker ring, heat resistant handle.
Cold resistance: ordinary rubber is -20 degrees -30 degrees later, that is, silicone rubber still has good elasticity at -60 degrees -70 degrees, and some special formulas of silicone rubber can also withstand extremely low temperatures.
Flame retardant: Silicone rubber itself is flammable, but when a small amount of flame retardant is added, it is flame retardant and self-extinguishing;And because silicone rubber does not contain organic halides, it does not smoke or emit toxic gases when burned. All kinds of occasions with strict fire prevention.
Electrical resistance: Silicone rubber has a high resistivity and remains stable over a wide range of temperatures and frequencies. At the same time, silicone rubber has good resistance to high-voltage corona discharge and arc discharge. High-voltage insulators, high-voltage caps for televisions, electrical parts.
The typical silicone rubber, i.e., polydimethylquan-siloxane, has a helical molecular configuration, its intermolecular force is small, so it has good resilience, and the formaldehyde pointing out of the spiral can rotate freely, so that the silicone rubber has unique surface properties, such as hydrophobicity and surface anti-sticking.