ELASTOSIL® RT 426 is a pourable, condensation-curing, two-component silicone rubber that vulcanizes at room temperature.


Main application: all-round potting compound


  •  Low viscosity
  •  High cured hardness
  •  Excellent heat resistance

Specific features of ELASTOSIL® RT 426

  • Condensation-curing
  • Flowable
  • Heat resistant
  • Two-component
  •  all-round potting compound

Catalyst T 37 is admixed to ELASTOSIL® RT 426 for long, and Catalyst T 40 for short pot lives and curing times.

We recommend running preliminary tests to optimize conditions for the particular application. Comprehensive processing instructions are given in our leaflet “ROOM TEMPERATURE VULCANIZING (RTV) SILICONES” – Material and Processing Guideline

The pot life is the period of time at 23 °C / 50 % rel. humidity during which the catalyzed mix to attain a viscosity of 100,000 mPa s and still be just pourable


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.

Sales and support

Wacker Chemical Corporation
3301 Sutton Road
Adrian, MI 49221-9397
United States
+1  888  922-5374 (Phone)

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