POWERSIL® 311 MH is a 1-component, ready to use, peroxide curing compound that cures to an electrically-insulating, highly erosion resistant silicone elastomer.


  • very good arc resistance
  • suitable dielectric properties
  • good mechanical properties

Specific features of POWERSIL® 311 MH

  • Excellent hydrophobicity behavior
  • Resistant to tracking and erosion


All the information provided is in accordance with the present state of our knowledge. Nonetheless, we disclaim any warranty or liability whatsoever and reserve the right, at any time, to effect technical alterations. The information provided, as well as the product's fitness for an intended application, should be checked by the buyer in preliminary trials. Contractual terms and conditions always take precedence. This disclaimer of warranty and liability also applies particularly in foreign countries with respect to third parties' rights.

POWERSIL® 311 MH is the silicone rubber of choice for the manufacture of electrical insulating equipment for outdoor use, e.g. composite insulators, arrester housings, bushings etc., especially suitable for extruded parts that are cured in air.


More information can be found in the brochure "Solutions for the Transmission and Distribution Technology".

POWERSIL® 311 MH is typically processed by extrusion onto rods, profiles or other semi-finished products and then cured at elevated temperature in air.

For detailed information please refer to our brochure "Solid and Liquid Silicone Rubber, Material and Processing Guidelines".

To achieve a good bond between typically-used materials for electrical insulation equipment a primer is necessary.


This product is available in 20 kg and 540 kg cardboard packaging.


Special delivery forms are possible but depend on several technical and commercial aspects. Please contact your local sales manager in such cases.


Further information for storage:

Store in a dry and cool place.


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.


The containers must be protected against sunlight. Keep separate from organic rubber and crosslinker chemicals.

Sales and support

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

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