ELASTOSIL® - Wacker Chemie AG


The Silicone System Solution for Vacuum Bags

In ELASTOSIL® C WACKER is offering the composites industry innovative silicone system solutions – e.g. for dimensionally accurate production of reusable vacuum bags: These lead to much greater ongoing production efficiency for both prepregs and infusion technologies compared with the conventional, disposable bags.

The two-part, platinum-curing, low-viscosity silicone rubbers cure in just a few minutes at room temperature, without shrinking. The system is optimally adapted to the standard processing and manufacturing methods: In ELASTOSIL® C, it is possible to rapidly produce reusable, precision-fit, fabric-reinforced silicone vacuum bags by a spray-up or lay-up method. Once made, this silicone bag can be placed quickly and securely over the mold before each part is produced. This eliminates time-consuming packing with conventional vacuum film.

Eight-step production process for a reusable vacuum bag made from WACKER silicone

ELASTOSIL® C is processed either by the spray-up or lay-up method (shown here):

  • Cut FABRIC C
  • Fill the sealing groove with ELASTOSIL® C
  • Create the first layer with ELASTOSIL® C
  • Apply the previously-cut FABRIC C
  • Create the topcoat with ELASTOSIL® C
  • Cure the vacuum bag at room temperature and demold
  • Post-cure the vacuum bag at the service temperature
  • Attach vacuum valve


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ELASTOSIL® C 1200 A/B spray up technique; hand lay up technique; Resin Transfer Molding (RTM)RTV-2Addition-curinghigh release effecteasy stretchable