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Expansion Joint Foam is a closed cell polyethylene foam, it can be used as a joint filler, joint former, grout check, non-load transfer filler, stop-end, insulant and more applications. It's compressible yet semi-rigid, non-absorbent and strong. The foam is light, clean and very easy to use, it can be used on all normal building surfaces. It's highly resistant to most site chemicals and oils, with weathering and ozone resistance.