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Polyethylene foam joint rod typically used in the for filling expansion joints prior to sealing. Poly backer rod can be used in many substrates, such as concrete, brick or block work and metals. The foam backing rod helps to prevent a joint from failing and significantly reduces the amount of sealant being used. Our backer rod does not rot and is chemically neutral.
Non absorbent compressible white closed cell polyethylene foam backup material.
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