Silicone Rubber from WACKER
The WACKER portfolio comprises around 1,000 silicone rubber products. The choice of additives determines the properties of each product during processing and in the end material. The most important additives are crosslinkers, fillers and catalysts.
Unvulcanized silicone rubber consists of polymers of different chain length or polysiloxane chains. These polysiloxane chains always have a silicon-oxygen backbone. Two organic side-groups – usually methyl – are attached to each silicon atom. The polysiloxane chains determine the essential material properties possessed by all silicone rubbers. Examples are heat resistance and electrical characteristics.
WACKER offers a broad range of different types of silicone rubbers.. They are sold under the brand name ELASTOSIL® , POWERSIL® , SEMICOSIL® , SILPURAN® , WACKER® Silgel , LUMISIL® , CENUSIL® and SILMIX® .
Chemical Principle Behind Crosslinking of Silicone Rubber
Uncrosslinked silicone rubber needs to be vulcanized to convert it into an elastomer. There are three types of crosslinking:
- Platinum-catalyzed addition curing
- Peroxide curing
- Condensation curing
All three types of crosslinking have advantages that WACKER utilizes in its various product groups. Find out more here More about the chemical principle behind the crosslinking of silicone rubbers .
Silicone rubbers can be converted into silicone elastomers by vulcanization (curing). They are classified according to the curing method, the viscosity of the base polymer, and whether they cure at high or room temperature:
- Solid silicone rubber (HTV)
- Liquid silicone rubber (LSR)
- 2-part silicone rubber (RTV-2)
- Silicone rubber (RTV-1)
- Silicone gels
Click here for more information on the different product types .
Processing Silicone Rubber
Silicone rubber is processed in different ways:
- Silicone Rubber (RTV-1/RTV-2); Silicone Gels
- Liquid Silicone Rubber (LSR)
- Solid Silicone Rubber (HTV)
Click here for more information on processing at WACKER and the advantages of the different processing methods.