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Extruded vs Expanded Polystyrene Insulation from Foamular

house clad with extruded polystyrene insulation

Extruded v's Expanded Polystyrene

There is often a great deal of confusion between expanded (EPS) and extruded polystyrene(XPS), with many people assuming they are essentially the same, but in fact expanded and extruded polystyrene are very different products.

Firstly there is the manufacturing procedure involved in creating the product. Expanded Polystyrene (EPS) is made using small expandable beads that inflate with heat, and then are placed into a mould, where they expand to fit the shape. The expanded beads trap air, which gives expanded polystyrene its insulation properties, but also leaves it venerable to water absorption, reducing the insulations effectiveness over time.

Extruded Polystyrene (XPS) is made by mixing polystyrene pellets with chemicals that liquefy the pellets. A blowing agent is then injected into the mixture, forming billions of miniature air pockets. This frothing mixture is then pushed through a shaping die to give the required size and minimise wastage. Once cooled the boards can be further shaped and wastage returned into the manufacturing process.

Foamular Extruded Polystyrene is manufactured by Owens Corning Asia Pacific. Owens Corning has developed a patented Hydrovac technology that makes the blowing agent more efficient and helps guarantee long term retention of R-values. Owens Corning is a member of EPA Climate Leaders Program, and is committed to reducing Greenhouse Gas Emissions in the manufacturing process through product performance.



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