SKV rod is flexible, readily compressible, and non-cross linked closed-cell polyethylene back-up filler for elastomeric sealants,supplied in roll form. The product is designed for the use in the construction/expansion joint filler in concrete, brick and block work. Use KV Rod as a bond breaker to prevent sealant adhering to the wrong surface (concrete or organic joint filler). It is light and durable material with excellent shock absorbing and heat insulating properties. It is compatible with most known cold applied sealants such as urethane, silicone, acrylic, butyl, polysulfides, latex, and chinking sealants.
| Form | : Compressible Closed Cell Foam circular cords |
| Durability | : Excellent dimensional stability |
| Excellent water absorption | : Negligible |
| Color | : White & Grey |
| Size | : From 6 mm to 100 mm |
Joints Preparation: The Joint surface must be clean, dry and free from oil, loose particles, cement laitance ant other contaminants which may affect the adhesion. A thorough wire brushing, grinding, sand blasting or solvent cleaning may be required to expose a clean and sound substrate. On painted surfaces all loosely adhering paint must be removed, if in doubt remove all previous decoartions. Remove all round or sharp edges and corners which might perforate or cause damage to the backing rod. The compressible joint filler shall be cut back to expose a uniform joint depth.
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.
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. SKV Rod installation shall be done only after the necessary primer has been applied to the edges of the joints.
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