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The Mar-Flex Crack Injection System is a two-part liquid polyurethane injection resin designed to permanently seal leaks in concrete structures.  When placed in contact with water, the liquid polyurethane resin expands to form a tough, flexible foam seal that can not be penetrated by water.

This system is proven successful in repairs on the following:
  • Expansion Joints
  • Swimming Pools
  • Foundation Cracks
  • Basement Walls
  • Cold Joints
  • Unshielded Electric Conduit
  • Subway/Highway Tunnels
  • Concrete Dams
  • Below Grade Parking Decks
  • Manhole Covers
  • Elevator Shafts and Service Pits
  • Water Holding Tanks
  • Repairs made from inside of structure
  • No costly outside excavation needed
  • Repairs made to wet or dry surfaces
  • Expands up to 400% for tight seals
Properties - Crack Injection System
Color Amber
Tensile Strength (ASTM D-1623) 31 p.s.i.
Elongation (ASTM D-1623) 45%
Shrinkage (ASTM D-2126) 0-3%
Water Absorption 
(Volume Confined)
(ASTM D-2127) <1
Shear Strength (ASTM C-273)34 p.s.i.
Viscosity 300 cps
Pot Life  Approx. 5 hrs.
(providing no moisture is present)
Cream Time 3 seconds to 30 seconds
(Reaction time after meeting water)
Yield 2-20 times expansion


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Greenville, IL 62246