Chemistry:PEF rod
From HandWiki
PEF rod or PEF backer rod is a flexible polyethylene foam cylinder that is pushed into gaps where there is a construction joint. The joint is usually filled to level with a viscous sealant to provide weather-proofing.
PEF rod typically comes coiled in a box, and comes in various diameters and lengths.[1] As a result of the foam structure, the material is low-density and flexible.
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