Multi-Purpose, Flexible Repair Composite.

Belzona 2221 (MP Fluid Elastomer)Multi-Purpose, Flexible Repair Composite.


Belzona 2221 (MP Fluid Elastomer) is a twocomponent elastomeric repair composite for the repairing and rebuilding of rubber components.

This versatile high-performance elastomer can be applied without the need for specialist tools and will bond strongly to a wide range of substrates including natural rubber, nitrile, neoprene, polyurethane, pvc, steel, copper, aluminium and concrete.


Key Benefits:

  • Application and cure at room temperature - no hot work involved.
  • Can be used for casting applications.
  • Excellent adhesion to a wide variety of substrates including natural rubber, nitrile, neoprene, SBR (Styrene Butadiene Rubber), polyurethane, PVC, steel, copper and concrete.
  • Reduced health and safety risks as it is solvent-free.
  • Seamless application small or large areas treated in one operation.
  • Good chemical resistance to a wide variety of chemicals.
  • Outstanding elongation – up to 700%.
  • Good electrical resistance.
  • Protection against erosion and corrosion.

Application Areas:


  • Creation and repair of concrete expansion joints to provide long-term performance.
  • Creation or casting of gasket seals.
  • Cold-curing alternative to vulcanized rubber repair of rubber linings.
  • Sealing SF6 gas leaks providing environmental protection.
  • The casting of new rubber components.
  • Protection of exposed threads.
  • Fast rubber repair of holes and cracks on pump diaphragms.




Cracked concrete VS Completed crack sealing application using Belzona 2221 (MP Fluid Elastomer).


Key Technical Data :

Key technical data:

Working life at 25°C (77°F) 

15 minutes

Time to full mechanical cure at 25°C (77°F)

18 hours 

Shore A Hardness (ASTM D2240)


Elongation tested with ASTM D412 (Die C)


Volume capacity (750g unit)

660cm³ (40.28

Coverage rate (750g unit)

1.76 sq.m. (18.9 sq.ft) at 375 microns (15 mil) thickness

Adhesion to mild steel (ASTM D429)

150 pli (2678 kgs/m)

Bonds to

Rubber, PVC, aluminium, concrete, copper, steel, stainless steel, cast iron, lead, glass, wood, most plastics and many more

Typical applications

Coating, lining, patch repairs and many more

Unit size

750g. Pack sizes may vary locally.