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The PE rod is a flexible, compressible, and non-cross-linked closed-cell polyethylene back-up filler for elastomeric sealants, available in roll form. This product is designed for use as a construction or expansion joint filler in concrete, brick, and block work. Use the KV Rod as a bond breaker to prevent sealants from adhering to unintended surfaces, such as concrete or organic joint fillers. It is a lightweight and durable material that offers excellent shock-absorbing and heat-insulating properties. Additionally, it is compatible with most known cold-applied sealants, including urethane, silicone, acrylic, butyl, polysulfide, latex, and chinking sealants.
Application Instructions
Joint Preparation: The joint surface must be clean, dry, and free from oil, loose particles, cement laitance, and other contaminants that may affect adhesion. Thorough wire brushing, grinding, sandblasting, or solvent cleaning may be necessary to expose a clean and sound substrate. For painted surfaces, remove all loosely adhering paint; if in doubt, strip away all previous decorations. Remove any rounded or sharp edges and corners that could perforate or damage the backing rod. The compressible joint filler should be cut back to reveal a uniform joint depth.
Installation
Select a backer rod whose diameter is at least 20% larger but not greater than 33% of the joint width. This will ensure that the backer rod remains in compression and in place during sealant installation. The backing rod shall be inserted into the joints by using a blunt tool or roller and forced gently into the joint till the desired depth is achieved.
Caution
Do not damage or poke holes in the backer rod during or after installation, since this may cause air bubbles in the sealant and affect its performance. Also, do not fold or overly stretch and compress the backer rod during installation. Ensure that it fits in tight against the sides of the joint. The Rod installation shall be done only after the necessary primer has been applied to the edges of the joints.
Specific Uses
Expansion joints * Highway Joints * Glazing * Log home chinking * Parking Decks * Curtain Walls * Coping Joints * Isolation Joints * Temporary Joint Seal * Perimeter of window and door frames * Pre-cast panels
Advantages
Economical * Easy to install * Readily compressible * Root proof and non-absorbent * Provides bond breaker and minimum strain shape for joint sealants * Provides a firm backing for sealant tooling
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