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SpecChem Rapid Flex CJ

SpecChem Rapid Flex CJ

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Contractor Overview

Rapid curing, semi-rigid polyurea control joint filler Rapid Flex CJ is a top-grade, 100% solids, two-component, UV-resistant, semi-rigid, rapid-curing polyurea solution designed for filling control and construction joints in industrial concrete floors. Its formulation allows for quick shaving of joints, facilitating fast project turnaround.

Best For

  • Floors

Key Features

  • Two-component epoxy chemistry
  • Used for bonding, repair, or protection applications

Material & Application Notes

Its formulation allows for quick shaving of joints, facilitating fast project turnaround.

Why Contractors Choose It

Contractors choose Rapid Flex CJ when bonding strength, placement consistency, and the right epoxy chemistry matter to the repair or installation.

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Application

Surface Preparation

  • Joint Cleaning:Ensure joints are clean, dry, and free of curing compounds, densifiers, sealers, or any other foreign substances. Use a vacuum-equipped dry-cut abrasive blade and oil-free compressed air to remove water or dust before application.
  • Joint Depth:Install Rapid Flex CJ full depth in sawcut control joints and at least 2 inches deep in joints greater than 2 inches. Avoid using compressible backer rod in sawcut control joints. In construction joints, dry sand or backer rod can be used to reduce volume while maintaining a minimum 2-inch depth.

Mixing and Application

  • Mixing Instructions:Ensure Rapid Flex CJ components are at least 50°F for mixing. Stir or shake each component before dispensing. Use a 1:1 ratio, low-pressure duplex/plural component metered pump with a 3/8” x 24” static mixer.
  • Application Process:For cartridge or plural component pump applications, dispense mixed material into a waste container first to ensure uniform color and consistent 1:1 ratio. Then, dispense properly mixed Rapid Flex CJ into the prepared joint. Overfill joints and allow to cure for about 1 hour, up to 24 hours before shaving flush with the floor using a razor scraper.

Curing and Shaving

  • Rapid Flex CJ sets quickly, reducing the risk of staining joint sides.
  • If installed before maximum concrete shrinkage, a crack may appear, which can be refilled with Rapid Flex CJ after cleaning with SpecChem Solvent 100.

Packaging

Available in 22 fl oz cartridges and 10-gallon units.

Shelf Life

Rapid Flex CJ should be stored in its original containers, kept tightly closed between 55-90°F, ensuring a shelf life of one year from the date of manufacture.

Standards

  • Approved for use in USDA, FDA, and CFIA regulated environments
  • Complies with ACI 302 guidelines for “Floor Joint Filler”
  • 100% solid content, VOC-free, and LEED compliant

Cleaning

Clean tools and equipment with water before the DUO PATCH hardens. Following these steps ensures a smooth application process and extends the life of your tools.