CRL 1-1/2 in Open-Cell Foam Backer Rod, 100 ft Roll - Sealant Backing

• Controls sealant depth and functions as an effective bond breaker for sealant joints
• Compatible with all cold-applied and hot-pour sealants (not for hot-applied traffic joints)
• Soft, highly compressible material allows for easy compression during installation

CRL Open Cell Backer Rod is a soft, round, highly compressible polyurethane foam designed to back cold-applied sealant joints and compatible hot-pour sealants. Its open-cell structure flexes to adapt to irregular or moving joints and resists damage from dynamic joint movement.

CRL Open Cell Backer Rod is available in diameters from 5/8” to 2” (16 to 51 mm).

Unlike closed-cell rods, open-cell construction eliminates the risk of outgassing when punctured, making this backer rod ideal for high-performance sealants such as silicones and urethanes.

Temperature Limits:
-60° to +500°F (-15° to +260°C)

Recommended Application:
Best used in vertical and horizontal wall joints. Not recommended for horizontal traffic surfaces such as pavement joints.

Size Selection:
Proper size selection is critical: the backer rod controls sealant depth and acts as a bond breaker to prevent back-side adhesion. Select a rod approximately 50% larger than the joint width for a tight, compressive fit.

Storage:
Store in a well-ventilated area out of direct sunlight. Keep away from heat sources and open flames.

Joint Preparation:

• New Joints: Clean thoroughly to remove form-release agents, curing compounds, or debris. Ensure the joint is clean and dry before applying sealant.
• Repairing Old Joints: Remove all old sealant or filler. Use wire brushing and air blasting for effective cleaning. If using an air compressor, ensure it has moisture and oil traps.

Installation Instructions:

1. Prepare the surface following the Joint Preparation directions.
2. Measure and Select: Choose the correct backer rod size based on joint width.
3. Set Depth: Install the backer rod to the depth recommended by the sealant manufacturer so the sealant forms an "hourglass" profile.
4. Use the Right Tools: Install with a blunt tool or roller. Use Cat. No