Comtech Polyethylene Back-up Rod

The Comtech Polyethylene Back-up Rod is a critical component in professional sealant installation, specifically engineered to support the structural integrity of expansion and movement joints. Manufactured from high-density polyethylene (HDPE), this rod provides the necessary bulk and shape retention to ensure that sealants are applied with the correct depth-to-width ratio, which is essential for optimal performance and longevity.

By acting as a non-adhesive backer, the rod prevents the sealant from bonding to the bottom of the joint, thereby avoiding 'three-sided adhesion' which can cause sealant failure under stress. Its closed-cell structure ensures it does not absorb moisture or chemical agents, maintaining its dimensional stability over time. This product is compatible with a wide range of silicone, polyurethane, and polysulfide sealants used in construction and industrial applications.

• Material: High-Density Polyethylene (HDPE)
• Function: Controls sealant depth and prevents three-sided adhesion
• Compatibility: Suitable for silicone, PU, and polysulfide sealants
• Durability: Closed-cell structure resists moisture and chemical absorption
• Application: Ideal for concrete, metal, and masonry expansion joints