Rapid Flex CJ – Control Joint Filler

Rapid Curing, Semi-rigid Polyurea Control Joint Filler

Rapid Flex CJ is a 100% solids, two component, UV resistant, semi-rigid, rapid curing, polyurea for filling control and construction joints in industrial concrete floors.

Rapid Flex CJ allows for joints to be shaved quickly for fast turnaround.

Compliance with ACI 302, section 4.10 recommendation for joint fillers used in saw cut/control joints with a Shore A Durometer of 85. 

USDA accepted and authorized for use in federally inspected meat & poultry plants.

Rapid Flex CJ can be used for the repair of damaged or spalled joint nosing and cracks. 


  • Industrial and commercial concrete floors subject to heavy forklift traffic
  • Heavily trafficked retail concrete floors 
  • Repair of cracks and joints in old concrete floors
  • Freezer floors


Features & Benefits 

  • Pourable, dark gray consistency
  • Easy 1-to-1 mix ratio
  • Semi-rigid flexibility that does not weld slabs together or become brittle with age
  • High elongation (200%) to resist tearing due to excessive movement
  • Optimum hardness (Shore A = 85) to transfer wheel loads while allowing moderate movement
  • Can be applied and cured down to -20 F
  • Available in 22 fl oz cartridges and 10 gallon units

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Product Resources

August 2018 SpecTech: Control Joints – Tips & Coverage

SpecChem Product Selection Guide

SpecChem Product Category Overview

SpecGuide: SpecChem Product Catalog

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