In recent years, the liquid rubber injection molding method (LSR), that is, the injection molding of liquid silicone rubber, has gained widespread popularity and promotion. Recently, this method has become a molding method that people in the industry are generally concerned about because of its advantages of short-time automatic molding and composite molding with plastics. The following will introduce the latest trends in liquid silicone rubber injection molding and materials suitable for this molding method

Advantages of liquid silicone rubber injection molding
1 Fully automatic molding: no flash, no runner, automatic demoulding
Regarding the fully automated molding process, people have carried out research from various aspects such as injection machines, molds, and materials. It not only saves manpower in process operation, but also reduces material costs because it does not produce useless solidified products. From the perspective of taking into account environmental protection, this method is also attracting attention. For the molding of micro products such as skeleton oil seals for automobiles, the molding cycle (from injection to the next injection) is required to be within 10s, which can be completed in a very short time.

2 Composite molding: insert molding, binary molding
Because the form of the crosslinking reaction is addition curing, it can be molded at relatively low temperatures. Since no by-products such as peroxide decomposition residues are generated during the cross-linking reaction, secondary vulcanization is not necessary in principle. Therefore, it can be integrally molded with the resin, and insert molding by coating the primer material, and the binary molding that integrates the sealing part and the skeleton part has also begun to spread.
Silicone rubber has excellent properties (heat resistance, plug resistance, weather resistance, electrical insulation, flame retardancy, etc.). Due to these properties, eco-friendly molding based on fully automatic molding, integral molding with metals and organic resins, is possible. In addition, the material itself is transparent and colorable, so its application range involves many fields, such as (computer, mobile phone, etc.) buttons, milk bottle nipples, (copiers, printers, etc.) rubber rollers, pipe joint seals, oil seals, etc. Various auto parts, TV picture tube anode caps, diving supplies, etc.