Silicone Rubber Definition and Category
Silicone Rubber
Silicone rubber’s special features as "Organosiloxanes Polymer" have originated from its unique molecular structure that they carry both inorganic and organic rubbers, In other words, due to the Si-O bond of Silicone Rubber and its inorganic properties, Silicone Rubber is superior to ordinary organic rubbers in terms of heat resistance, chemical stability, electrical insulating, abrasion resistance, weather ability and ozone resistance etc… the silicone rubber compounds are used in various ways of application such as Keyboard pad, industrial rolls, wires, thermal conductive pads, medical products, kitchenware, etc.
With these unique characteristics, Silicone Rubber has been widely used to replace petrochemical products in various industries like aerospace, munitions industry, automobile, construction, electric and electronics, medical and food processing industry. Recently, these scopes of silicone application have been expanding at a great speed by the demand of industries that want more reliable elastomer.
Silicone Rubber is classified into HTV Silicone Rubber (High Temperature Vulcanization Silicone Rubber) and RTV Silicone Rubber (Room Temperature Vulcanization Silicone Rubber) by its curing temperature. Also, HTV Silicone Rubber is divided into Millable Type Silicone Rubber and Liquid Type Silicone Rubber by its degree of polymerization.
Millable Type Silicone Rubber (High Consistency Silicone Rubber)
Millable Type Silicone Rubber is composed mainly of Polyorgarnosilioxan(Silicone Polymer) and Silica with various additives to grant diversified characteristics. We call this stage of Silicone Rubber as "Base Compound". Then this "Base Compound" is catalyzed, pigmented with roll and cured by press molding and extrusion etc… Due to its status, Millable Type Silicone Rubber is also called as "HCR(High Consistency Silicone Rubber)" in the market.
LSR is Liquid Type and High Temperature Vulcanization Silicone Rubber. LSR differs from Millable Type Silicone Rubber and RTV (Room Temperature Vulcanization) by its degree of viscosity and curing temperature. LSR(Liquid Silicone Rubber) is perfect rubber material for automated injection molding due to its excellent liquidity. Also, LSR(Liquid Silicone Rubber) is ideal for complex molds, demanding design and tolerance because it can easily fill the most complex part of a mold.
-----------From HRS Silicone