Silicone rubber is an elastomer that has many unique properties that enable the extensive use of silicone rubber for different applications in the medical, food, aerospace, and consumer industries.
What are the different types of silicone?
* FSR-Fluorosilicone Rubber
* HCR-High Consistency Rubber (or solid silicone rubber)
* LSR-Liquid Silicone Rubber
* RTV-Room temperature Vulcanize
Like silicone, fluorosilicone rubber is a long-lasting elastomer that is stable, typical applications include aerospace fuel system components, diaphragms, gaskets, hose lining, seals, and O-rings.
HCR vs LSR
Based on the different cure and processing methods, silicone rubber can be classified as solid silicone (HCR) and liquid silicone (LSR).
HCR is produced as gummy, high viscosity solid rubber that is partially vulcanized. Process ways include compression molding, transfer molding, and extrusion of rubber tubing.
LSR on the other hand are supplied in drum or pails in liquid rubber form, due to their low viscosity, injection molding is the perfect way to process LSR.
HCRs are less expensive than LSRs both for raw material and tool mold cost. HCR’s methods are better suited for smaller production runs, while LSR is a better fit when making thousands or millions of parts.
RTV vs HTV
In terms of polymer employed and the curing process, silicone rubbers can be divided into room temperature vulcanized rubbers(RTV) and high-temperature vulcanized rubbers(HTV). RTV silicone rubbers come as a soft paste or a viscous liquid. HTV silicone rubbers come in two different physical states: liquid and solid.
The above are various types of silicone rubber, in this post, we will focus specifically on the HCR silicone rubbers’ special properties and their applications.
Silicone materials classification and their characteristics, and applications
Silicone rubbers have exhibited excellent properties, such as thermal conductivity, fire resistance, good chemical stability, flame retardancy, excellent resistance to heat and cold, etc. By changing the base polymer, adding reinforcing filler and special additives, parts of properties will be strengthened significantly to meet special application needs, silicone rubber will be classified based on its standout properties.