ELASTOSIL® A 442 is a one-component, thixotropic sealant intended for use where a soft, high elongation material is desired. ELASTOSIL® A 442 is particularly effective as an adhesive in applications where the bonded joint is subjected to relatively large movements in service.


  • Tenacious adhesion to most metals, plastics, synthetic rubbers, glass and concrete
  • Low modulus of elasticity for superior sealant joint movement capability
  • Low compressive modulus, ideal for forming compression gaskets on covers and closures where low clamping pressures are essential
  • Stays flexible between -65°F and 400°F
  • Impervious to weathering and ultraviolet degradation
  • Resistant to hot lubricating oils
  • Causes little or no foam in lubricating oils
  • Non-corrosive to ferrous metals

The performance of ELASTOSIL® A 442 is dependent upon many factors, including the application method, the thickness of the layer deposited, the substrate, the curing atmosphere, and the curing cycle.


skin should form over the surface it may be removed by careful skimming. Spray equipment and brushes
should be washed and wiped clean with naphtha or mineral spirits after use.

The adhesion of ELASTOSIL® A 442 to most substrates can be enhanced by a 30 second to one minute preheat cycle at 60-70°C before exposure to the UV source


The "Best use before end date" of each batch is shown on the Certificate of Analysis. Storage beyond the date specified on the Certificate of Analysis 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.

Vertrieb & Support

Wacker Chemie AG
Heilbronner Strasse 74
70191 Stuttgart
+49  711  61942-0 (Phone)
+49 711 61942-61  (Fax)

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