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Merbenit HM21 - SMP universal sealant

Merbenit HM21 is a SMP (Silane Modified Polymer) based adhesive, suitable for heavy loads.

Merbenit HM21 - SMP universal sealant

Merbenit HM21 is a highly durable, universal sealant with excellent bonding and sealing properties.

The adhesive has a 2 N/mm2 tensile strength and a 400% elongation at break, making it ideal for heavy loads.

The adhesive is odourless and free of solvents, isocyanates and silicones.

The product is available in black, white, grey.


  • Flexible bonding and sealing in the areas of metal, apparatus and machine construction, plastics technology, air-conditioning and ventilation systems, car body, wagon, vehicle and container construction.
  • Sealing casing and covers, sealing and bonding bonding displays and windows and decorative panels and functional elements.


  • Compatible with paints
  • Simple processing
  • High elasticity, good mechanical strength
  • Long processing time
  • Odourless and free of solvents, isocyanates and silicones
  • Chemical neutral polymerisation
  • Non-corrosive on surfaces
  • Impact and vibration resistant (shock absorbing)
  • Grindable and paintable
  • Very wide adhesion range
  • Very good sealing properties

For pack sizes, please see Additional Information.

Chemical resistance

  • Good against water, aliphatic solvents, oils, grease, diluted inorganic acids and alkalis
  • Moderate against esters, ketone and aromatics
  • Not resistant against concentrated acids and chlorinated hydrocarbons

This product is part of the Merbenit range


To request any type of technical sheet or safety sheet.