Q1 : How is EPS made? EPS is produced from solid beads of polystyrene with added pentane. Expansion is achieved when heat in the form of steam is applied to the raw material. This results in the gas expanding and forming closed cells of EPS. These cells occupy approximately 50 times the volume of the original polystyrene bead. By comparison this would be the same as expanding a tennis ball to the size of a basketball. When EPS has been expanded it consists of 98% air and 2% polystyrene. As a single polymer material, it is easy to recycle.
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