XPS is extruded polystyrene, a type of foamed polystyrene board that is intended for insulation purposes. Conventionally, foamed polystyrene boards are known as EPS. So, how do we distinguish them? Hence, the letter X was chosen to emphasize the extrusion process that is required for production. Other examples include XEPS (extruded expandable PS beads), XPET (extruded foam PET) etc.
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XPS is undergoes a continuous extrusion process, during which the physical blowing agents are injected into the molten PS. The mixed PS, blowing agents, and other additives are subsequently cooled by the cooling extruder. As the result, the pressurized and viscous molten material are extruded through the slot die. When the material exudes from the slot die, pressure is released, and the foaming process initiates. The foamed material will pass through the calibration system to embody shapes and models.
ComparisonsExpanded Polystyrene (EPS)Extruded Polystyrene (XPS)
Raw materialsPolystyrene resinPolystyrene resin
Manufacturing processPolystyrene (PS) initially expands, and then it is molded to form a close cell material.PS and other ingredients are mixed and fed into the extruder with blowing agents injected. The rigid foam board is extruded and expands through the slot die.
Thermal conductivity (W/m·K) ≤0.042≤0.030
Compressive strengthUp to 400KpaUp to Kpa
Water absorption ％ (v/v)≤4≤2
SizeWidths: up to mm
Lengths: up to 400mm
Thicknesses: up to 90mmWidths: 600mm, 900mm, mm
Lengths: mm
Thicknesses: 20 to 150mm
The biggest difference between EPS and XPS is cell structure, that results in EPS having worse (higher) water absorption and worse (lower) R-value per inch.
Extruded Polystyrene (XPS) rigid foam insulation has very well defined, uniform closed cells with continuous walls. The combination of hydrophobic (water-resistant) polystyrene polymer and closed cell walls results in a very low water absorption rate for XPS rigid foam insulation.
There are hundreds of XPS brands all over the world.
Below we list some global brands or brands that have a higher reputation in certain regions. For your reference when choosing XPS board.
If you want to learn more, please visit our website XPS foam board machinery.
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The Kingspan Group was formed in the mid s in Ireland and today is one of the world’s leading construction product manufacturers.
Kingspan GreenGuard® XPS insulation board offers an R–value of 5.0 per inch of thickness and is ideal for a variety of applications including below slab, below grade along the foundation, inside basement walls, exterior insulation over wood sheathing and residing.
Beijing Beipeng specializes in R&D and production of thermal insulation materials. Beipeng has more than 7 XPS production lines. It is one of the most influential companies in energy-saving thermal insulation industry in China.
Its headquarter is located in Beijing, the capital of China, with production bases and subsidiaries in Beijing, Tianjin, Hebei, and overseas.
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