J&K Foam FPHT12350G60 3" x 1/2" Gray Non-Crosslink Polyethylene Foam - Non-Crosslink Polyethylene expansion joint filler foam can be used in all standard concrete construction, such as highways, runways, parking garages, driveways, sidewalks, and floor slabs. It can also be used as a buffer between dissimilar materials such as columns, manhole covers, and adjacent constructions. It is approximately 10 times lighter than traditional expansion joint products