What is the difference between EPS insulation board and XPS insulation board?
Test according to the national standard (100 x 100 x thick, 70 C 48h), currently used in China (including foreign) deformation of XPS is about 1.2%, while the EPS is less than 0.5%, so the use of XPS mortar and paint protection board outside the building exterior insulation system cracking. EPS has good weather resistance and dimensional stability at temperature changes. It is the most widely used thermal insulation material for exterior wall in the world and in china.Cause analysis: EPS is generally free foaming under atmospheric pressure, and then through curing, molding (final foam), plate curing process, during which time for days, the pore structure is essentially a circular hole, the fusion is relatively good, so the overall good dimensional stability. While XPS is almost in an instant foaming, because of the high temperature and high pressure suddenly changed into atmospheric pressure, the foaming process is difficult to control, if the back cooling is not good, the quench will cause stress concentration; XPS in foaming at the same time, but also by the extrusion leveling machine, which basically only in length and expansion. The width direction so that the internal pore structure of the spindle, the spindle hole in the tip of the external force (such as temperature stress) will produce stress concentration; stress concentration to a certain extent will cause deformation, so its poor dimensional stability.
XPS thermal conductivity is smaller than EPS, and has high heat resistance, low linear expansion ratio, the characteristics of the low, the obturator structure rate reached more than 99%, the formation of a vacuum layer, avoid air flow cooling, to ensure that the insulation performance of lasting and stable, with respect to the obturator rate of EPS 80%, the advantage is self-evident. Practice has proved that the insulation effect of 30mm thick XPS insulation board is equivalent to that of 50mm thick EPS insulation board and 120mm thick cement perlite. Therefore, in order to achieve the same insulation effect, the insulation thickness of EPS can be about 30% thinner than that of XPS. But since the price of XPS is about 2 times that of EPS, the economy of XPS is still not as good as that of EPS.
Polystyrene board (EPS) is a kind of foam material with closed cell structure formed by foaming and molding with polystyrene resin as its main component.Extruded board (XPS) is a rigid foam material with a closed cell structure made of polystyrene resin or its copolymer as the main component, adding a small amount of additives and heating and extruding.
