Backing rod
Description 
backing rod is a round, flexible, backing rod made of extruded polyethylene foam. It is available in a variety of diameters to fill expansion joints.
backing rod is chemically inert, and resistant to oils, gasoline, and solvents.
It does not stain or adhere to sealant materials, acts as a bond-breaker-strip.
backing rod has a resilient closed-cell structure and is non-exuding.
SCOPE OF USE
Backing rod is a backing for elastomeric and other cold-applied sealants. It is used in expansion or contraction joints to:
- Control the depth of applied sealant.
- Act as a barrier interface to prevent three sided adhesion (bond breaker)
- Provide a form to assist the sealant in developing the hour glass shape.
Typical uses are in glazing and expansion joint applications for windows, certain walls, expansion wall joints, partitions, doors, setting cracks, pavements, precast units, and copings.
SURFACE PREPARATION
Joint should clean, moisture free, and clear of any obstruction.
PRODUCT APPLICATION
Either cut the desired length of backing rod or dispense directly from reel. Position backing rod in the joint at the depth specified by the sealant manufacturer or architect. Using a blunt tool or roller, press the rod uniformly into the joint at the specified depth. Apply the sealant over backing rod according to manufacturer’s directions.
PRECAUTIONS
Do not puncture, over compress or stretch backing rod during insertion.