Nomaflex REJ-050-4000-5 1/2 in. x 4 in. x 5 ft. Expansion Joint Filler (50 ft. Bundle)

Item No. 30803
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The Nomaflex REJ-050-4000-5 1/2 in. x 4 in. x 5 ft. Expansion Joint Filler (50 ft. Bundle) is a semi-rigid, closed-cell polypropylene foam that simply performs better and installs faster. Nomaflex is a closed-cell polypropylene foam that can be used in residential, commercial, civil, municipal and industrial applications. It will not absorb water, swell and disintegrate and it extends the service life of concrete by reducing the amount of imcompressible materials entering the joint. Nomaflex does not impede sealant cure time and can be used without a bond breaker with no impact on the long term performance of the sealant. Nomaflex resists oils, gas, salts, acetone and other chemicals. It does not leach like other products and is not sticky. Nomaflex is waterproof and can be stored outside. It will not break or flake due to weather elements. Nomaflex lasts longer and is 100% recyclable. Nomaflex fully complies with ASTM standard specification D 8139, and ASTM standard specification D 1751 for extrusion, compression recovery and water absorption as tested per ASTM test method D 545.


  • Light weight - Does not absorb moisture or swell
  • Does not break easily
  • Bond Breaker - Faster sealant cure times
  • No waste due to breakage
  • Flexible - bends around circular structures
  • Can be used with hot-pour and cold-applied sealants
  • Odor-free
  • Recyclable
  • Reusable
  • Easier to cut, handle, store - No power tool required
  • Less expensive to install, no waste, no void cap with cap cutter
  • Concrete does not stick - Sweep clean
  • Use as a form - No release agent needed
  • Does not leach or stain surrounding concrete
  • Inert - Resists oils, gasoline, salt, acetone, MEK, xylene
  • Requires less long term joint maintenance


Water Absorption<1%
Compression Strength>30 psi and <60 psi
Compression Recovery>80%
Freeze Thaw ResistanceNo Change
Heat Resistance392°F +/- 5°F
UV WeatheringNo Change
Extrusion<0.1 in.
Density>3.5 lbs./cu.ft.
Boiling in Hydrochloric AcidNo disintegration
Expansion in Boiling Water<1% expansion
Out-Gassing (no. of bubble)0