The production process of Extruded polystyrene insulation (XPS) or Styrofoam is extrusion. This manufacturing process involves melting together the plastic resin and other ingredients. The liquid material is extruded through a die and expands during the cooling process. This continuous process results in almost 100% closed-cell structure. Besides, the surface of of XPS board is smooth and flat without breaks. Thanks to this closed cell structure, extruded polystyrene (XPS) can prevent water penetration to the structure and provide long term strength, insulation and durability.
Expanded Polystyrene insulation (EPS) is widely used in building construction industry, ICF blocks and so on.. EPS beads are contained in a mold and then heat which causes the small beads expanded and fuse together. Each individual bead is the cosed cell but there is significant open space between the beads.
Now more and more people pay attention to the environmental protection. It is important to handle the waste XPS board. Waste XPS board could be recycled competely with recycling system in XPS production line. The recycled material can be used when manufacturers produce XPS foam board. So it is environment-friendly. While EPS is a major contributor to trash pollution across the world.
Physical & chemical properties
Although XPS and EPS boards are widely used in construction and insulation. But their physical & chemical properties is different. Kindly review the following chart for XPS and EPS Physical & chemical properties.
XPS Physical & chemical properties
|Compression Strength||Thermal Conductivity|
|Water Absorption(%)||Moisture Permeability（ng/msP）||Dimension Stability（%)|
|Water Absorption（%）||Heat Conductivity（W/m·K）||Compression|
EPS: The polystyrene beads of EPS are expanded with blowing agent like: Propane C3H8; Pentane C5H12; Methylene chloride CH2CL2.
XPS: CO2 /Butane/DME/HFC/Ethanol blowing agents are recommended when produce XPS foam board.
EPS will cost 10% to 40% less per unit measure than the XPS foam. But physical & chemical properties of XPS is better than EPS. You can choose the right insulation board on the basis of budget and applications of the project
EPS is “block” material and XPS is “sheet” material. The thickness of EPS is bigger than XPS. The specification of XPS and EPS can be customized according to customer’s request.
XPS and EPS boards are widely used in contruction industry because of compatibility. Due to high compression strength, XPS tends to be better than EPS when you using the boards in flooring.