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Thermostik 840-10

Product Description
Installation and
Technical Literature


Thermostik® 840-10 is a 100% solids, asphalt extended, ambient temperature, vulcanizing adhesive, supplied as a two component unit consisting of two liquids which are mixed to produce a pourable adhesive. Thermostik® 840-10 is used for bonding fibreboard, polystyrene, polyisocyanurate, fibrous glass, asphaltic boards, or mineral wool to wood, aged asphalt composition or coal tar roofing, or concrete in the construction of roof decks as well as to modified bitumen membrane air/vapour barriers, asphalt built-up vapour barriers, and Blueskin® membranes. Can also be used for laminating insulation panels to one another. Used as a non–shrink filler in conjunction with Blueskin® Primer Ultra for “plastic boxes” or “pitch pans”.


  • Sets very rapidly and develops a strong bond
  • Internal setting - may be used between impervious surfaces
  • 100% solids - solvent free
  • Elastomeric - remains flexible after curing
  • Wide temperature window - can be applied at temperatures down to -10º C
  • Compatible with all insulation including polystyrene
  • Can be used on asphalt and coal tar surfaces

Data Sheets

Thermostik 840-10 Data Sheet Download PDF      

SDS Sheets

Thermostik 840-10 SDS Sheet Download PDF      


Henry Thermostik 840-10 Pitch Pocket Download PDF