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eps xps and polyiso three very similar forms of board insulation used in home construction and in the building construction industry in general in todayamp;#39;s video weamp;#39;re going to look into how they are made and compare their physical and chemical properties letamp;#39;s start with eps or expanded polystyrene the monomer styrene is composed of a benzene ring c6h6 and ethylene they are both made by the petrochemical industry under heat or by an initiator like benzoyl peroxide the double bond between the carbon atoms is converted into a single bond and a polymer chain called polystyrene is formed this liquid polystyrene is dropped in water to form droplets or beads this video shows how polystyrene pellets expand in the presence of steam commercially the polystyrene beads are expanded with blowing agents such as propane pentane and methylene chloride the eps beads are contained in a mold and then heat or steam is applied to it which causes the small beads to expand and fuse t