Product Overview

CRL Closed Cell Backer Rod is a highly versatile and reliable product. It is a round, flexible, closed-cell polyethylene foam with an exterior "skin," designed to serve as a backing and thickness control device for elastomeric and other cold-applied sealants. The backer rod becomes an integral part of the joint into which it is installed and is available in a range of diameters to accommodate joints from 3/16 inch to 1-5/8 inch. This limits the depth of the sealant, preventing excessive use of sealants. Moreover, the backer rod's non-bonding "skin" allows the sealant to stretch and recover with joint movement, exerting minimal stress on the points of adhesion to the substrate.

Product Warning: It's critical to avoid tearing, puncturing, creasing, over-compressing, or stretching the backer rod during insertion. Always use the correct size Backer Rod for the specific application and refer to the size selection chart. It's important not to use it with hot-applied sealants or hot melt adhesives where the surface temperature is over 160 degrees Fahrenheit (71 degrees Celsius).

Key Features:

• Allows Easy Control of Sealant Application Thickness.
• Preferred for Exterior Installations Where a More Positive Seal is Required.
• Won't Adhere to Sealants; No Bond Breaker Needed. 
• Compatible with All Cold-Applied Sealants.