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Content Guide

Rubber Fabrication Processes


Achieve processing flexibility with Silastic® brand engineered elastomers

Fabricate with proven silicone rubber elastomers. With more than 50 years of rubber industry experience, a wide range of innovative materials and application expertise, Dow Corning can help. Working together, we can help you develop the solutions you need for meeting automotive design, production and performance challenges.

Dow Corning rubber fabrication expert

Draw on our experience with these silicone rubber processing methods:

Extrusion – Unvulcanized rubber is continuously extruded through a die to form a desired uniform cross-sectional size and shape which is then cured by passing through a horizontal or vertical heating chamber.
  • High production rates
  • Ideal for tubing, rods, lager gaskets, seals, wire insulation, molding preforms
  • Per-part cost is dependent on extrusion complexity
  • Tooling cost varies by design complexity
  • Used for processing HCR and FSR
Injection molding – Unvulcanized silicone rubber is injected directly into a closed, heated mold using speed and pressure.
  • Typically lower per-part production cost
  • High production rates possible
  • Short molding cycles possible
  • Semi-automated and automated processing
  • Minimal flash/flash free molding
  • Ideal for intricate designs (engine mounts, over-molded seals) and close tolerances
  • Used for processing HCR, FSR, LSR and F-LSR
Compression molding – Unvulcanized rubber is placed into a heated mold. The mold is closed, which forces the rubber into all parts of the mold cavity. The part is cured using heat and pressure.
  • Molds are typically less expensive
  • Used for both high and low volume runs
  • Short setup time
  • Low waste with correct mold design
  • Ability to mold intricate shapes
  • Used for processing HCR and FSR
Calendering – Unvulcanized silicone rubber is processed through a two-, three- or four-roll calender to produce supported and un-supported continuous sheeting of uniform thickness.
  • Ideal as a precursor for mandrel-wrapped hoses and ducts or for die-cut seals
  • Can be coated onto fabrics or used unsupported in very low weights and thicknesses
  • Can be cured in-line but typically uses secondary processes
  • Used with HCR and FSR
 
 
Fabricating ProcessHCR
(High Consistency Rubber)
LSR
(Liquid Silicone Rubber)
FSR
(Fluorosilicone Rubber)
F-LSR
(Fluoro Liquid Silicone Rubber)
ExtrusionX X 
Injection MoldingXXXX
Compression MoldingX X 
CalenderingX X 

Get the innovative elastomers and support you need to meet production requirements for economy, reduced scrap and high-quality automotive components.

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Learn more about engineered elastomers from Dow Corning

About Silicone Rubber
Rubber Fabrication Materials
Fluoro Liquid Silicone Rubber
Custom Silicone Rubber Elastomers
Airbag Coatings and Seam Sealants

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