Merbenit HM21

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 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

Please be advised

As COVID-19 continues to impact many industries, companies and their day-to-day processes, we would like to assure you that Antala Ltd is classified as an “Essential Business” and is open for business as usual. 

We have implemented our continuity plan to maximise the safety of our employees while still providing critical support, sales, and fulfilment services to our domestic and international customers. 

Please contact us via phone, website or email 

We wish you the best during this difficult period.