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What is EPS insulation? Expanded Polystyrene Insulation (EPS) is made by pouring foam beads into a mold. Direct application of heat or steam causes the beads to expand and fuse together. To sustain load and back-fill stresses, EPS is offered in a variety of compressive strengths. This closed-cell structure has a low vapour persistence and…

Expanded Polystyrene (EPS) is a thermoplastic foam material that is rigid and has closed cells. It is made of solid polystyrene beads that are dissolved in an expansion gas called pentane. Polystyrene is polymerized from styrene monomer. Little pockets of gas within each solid polystyrene bead expand when heat is provided in the form of steam,…