吸水率是衡量保温材料的一个重要参数。保温材料吸水后保温性能随之下降，在低温情况下，吸入的水极易结冰，破坏了保温材料的结构，从而使板材的抗压及保温性能下降。由于聚苯乙烯分子结构本身不吸水，板材分子结构稳定，无间隙，解决了其它材料漏水、渗透、结霜、冷凝等问题。
Water absorption is an important parameter to measure thermal insulation materials. The thermal insulation performance of the insulation material decreases after absorbing water. At low temperature, the water absorbed is easy to freeze, which damages the structure of the thermal insulation material, thus reducing the compressive and thermal insulation properties of the board. Because the molecular structure of polystyrene is not water absorbing, the molecular structure of plate is stable and there is no gap, so the problems of water leakage, penetration, frosting and condensation of other materials are solved.
4、质地轻、使用方便
4. Light texture, easy to use
XPS板的完全闭孔式发泡化学结构与其蜂窝状物理结构，使其具有轻质、高强度的特性，便于切割、运输，且不易破损、安装方便。
The chemical structure and honeycomb structure of XPS board make it have the characteristics of light weight and high strength, easy to cut and transport, not easy to damage and easy to install.
5、稳定性、防腐性好
5. Good stability and corrosion resistance
长时间的使用中，不老化、不分解、不产生有害物质，其化学性能极其稳定，不会因吸水和腐蚀等导致降解，使其性能下降，在高温环境下仍能保持其优越的性能，根据有关资料介绍，XPS挤塑保温板即使使用30～40年，仍能保持优异的性能，且不会发生分解或霉变，没有有毒物质的挥发。
In the long-term use, it does not age, decompose and produce harmful substances. Its chemical properties are extremely stable, and it will not degrade due to water absorption and corrosion. It can still maintain its superior performance in high temperature environment. According to the introduction of relevant information, XPS extruded heat preservation plate can maintain excellent performance even if it is used for 30-40 years, and will not decompose or mildew, No toxic volatilization.