Silicone rubber is the most commonly used synthetic ruuber or polymer. This rubber has similar bond structure as found in glass, sand and quartz. Silicone rubber is composed of composed of silicone, which is itself a polymer, together with hydrogen, carbon, and oxygen. This is a unique synthetic elastomer which is made from a cross-linked polymer that is reinforced with silica. The characteristic of this rubber is such that it provides the perfect balance of mechanical and chemical properties which is required in today's most demanding applications.

Properties of Silicone Rubber

• Resistnace to wide temperature range. It offers excellent resistance to extreme temperatures, the range of which can be from minus 100°F to plus 500°F.
• Better oil and water resistance.
• The tensile strength, tear strength, elongation and compression set are far superior to conventional rubbers.
• Susceptible to ozone, UV, heat and other aging factors.
• Resistant to steam.
• Metal detectable.
• Glows in the dark.
• Electrically conductive.
• Resistant to oil/chemical/acid/gas resistance.
• Low smoke emission and flame retardant.

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Silicone Rubber Applications

• This rubber can be extruded into tubes, strips, solid cord or any custom profiles.
• Silicone Rubber can also be moulded into custom designs and shapes.
• This form of synthetic rubber is available for making molds that are poured, brushed or sprayed on to a model.
• Suitable for casting low melt metal alloys like lead, tin, pewter.
• Also used in the production casting of resins.

Advantages of Silicone Rubber

• High and low temperature stability
• Inertness, that is no taste or smell
• Translucent and easy to color
• Wide hardness range
• Chemical resistance
• Weatherability
• Sealing performance
• Electrical properties
• Compression set resistance

Disadvantages of Silicone Rubber

• These rubber is generally high in cost.
• It is sensitive to substances like sulfur clay that may prevent the silicone from curing which is known as cure inhibition.
• This rubber is usually very thick, having high viscosity.
• It must be vacuum degassed before pouring to minimize bubble entrapment.

Forms of Silicone Rubber
This rubber is available in the following forms:

• Compounds: These are ready to use materials which can be pigmented and catalyzed for your processing equipment and end application.
• Bases: These silicone polymers contain a reinforcing filler. The bases can be further compounded with additives and pigments that produce a compound which meet your color and other fabrication needs.
• Liquid silicone rubber (LSR): This rubber system can be pumped into a suitable injection molding machine which then can be heat cured to produce molded rubber parts.
• Fluorosilicone rubber compounds and bases: They maintain many key properties of silicone, but also has other characteristics of superior chemical, fuel, and oil resistance.