Hbr is a closed cell polyethylene foam backer rod joint filler that is used as a backing material for elastomeric and other cold applied sealants. Ocbr open cell backer rod product description type o cylindrical flexible sealant backings composed of predominantly open cell material per astm c 1330. It provides a highly durable bond breaker to prevent 3 sided adhesion which would otherwise reduce the sealant s functional elasticity.
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