N Mastic

N Mastic


Selleys N-Mastic is a non-skinning polybutene-based compound. It will remain permanently soft and paste-like.

  • Non-hardening - remains permanently flexible to provide a lasting seal
  • Good adhesion - adheres well to most substrates
  • Moisture resistant - provides an excellent barrier to water vapour transmission
  • Resists microbial attack
  • Low shrinkage - avoids the risk of sealant pulling away from joint surfaces
  • Wide service temperature range - withstands –40°C to +80°C service conditions



Suitable for

  • Sealing concealed lap joints between plastics, metals, timber, glass, masonry, and expanded foam panels.
  • Installation of cool rooms, prefabricated construction and gasket sealed windscreens to exclude draughts and water penetration through joints in materials.


Technology Polybutene
Skin Time (23C/50%RH) N/A
Movement Capability ± 8%
Tensile Strength N/A
Shore A Hardness N/A
Curing rate (23C/50%RH) N/A

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