Silicone Rubbers

These are the high performing silicone products we offer:

  • Outstanding mechanical and electrical insulating properties
  • Shortened development time
  • Optimized manufacturing capabilities
  • Fabrication options including extrusion, injection molding, compression molding and calendaring
  • They can be easily mixed to produce intermediate Durometer Shore hardnesses
  • Individual grades are also available in our standard product range (see below)

Both solid and liquid silicone rubbers are made of three components:

  1. Polymers
  2. Fillers
  3. Additives


Silicone is part inorganic, part organic. It shares the same Si-O backbone with inorganic materials such as quartz or glass. But, silicones also contain organic groups which are attached to the silicon.

– SiR2 – O – SiR2 – O – SiR2 – R = Me, Phenyl, Vinyl

The organic groups on the polysiloxane backbone may be methyl (Me), vinyl or phenyl groups.


  • Polydimethylsiloxanes
  • Polydivinylsiloxanes
  • Polyphenylsiloxanes


  • Reinforcing fillers such as fumed silicas with very large BET surface areas (larger than 100 m2 per gram), precipitated silicas and carbon blacks
  • Non-reinforcing fillers such as diatomaceous earth, quart, and carbon black


  • Crosslinkers
    • Peroxides
    • Platinum catalysts
  • Pigments
  • Mold release agents
  • Stabilizers
  • Plasticizers
  • Blowing agents
  • Flame retardant


The standard packaging available is in 20 kg (44lb) cardboard packaging with polyethylene liner.

Storage and Shelf Life

Please store the cardboard boxes in a dry and cool place. Already opened boxes should be closed again to avoid any contamination. The ‘Best use before end’ date of each batch is shown on the product label. Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable.  In this case however, the properties required for the intended use must be checked for quality assurance reasons.

When stored at or below 35°C in the original unopened containers, this product has a life of 6 months. To achieve the product best processing performance, the product should be used within 3 months.

Standard Product Grades

Silicone rubbers have excellent resistance to harsh environments and their ease of processing via various methods (molding, extrusion, calendering and coating). We offer the following standard products grades. But they can be easily mixed to produce intermediate Durometer Shore hardnesses.

A typical format of COA, for an Extrusil high-temperature resistant grade, will list the specifications, test methods, appearance, and values for the batch at the specified curing agents and curing conditions (temperature * curing time).