Expanded polystyrene (EPS) is a rigid cellular plastic material with an air-filled closed cellular structure manufactured by moulding beads or granules of expandable polystyrene or one of its copolymers. EPS is a good thermal insulator and is therefore often used as thermal insulation materials in buildings. One of the most important factors in selecting thermal insulation products for building applications is thermal conductivity. Other important parameters are water vapour transmission properties, water absorption, and mechanical properties including compressive stress at 10% deformation, etc. Determination of some of these properties is a difficult task and time-consuming. Density determination is a simple, fast, and inexpensive procedure. Once a relationship between these properties and density was established experimentally, measuring the density-related value of some of these properties can be estimated with a good approximation. In this paper, the relationship between compressive stress at 10% deformation and thermal conductivity with the density of expanded polystyrene (EPS) is studied. Tests for determination of density, thermal conductivity, and compressive stress at 10% deformation of domestic EPS panels were conducted on 209 samples. Experimental results showed that thermal conductivity decreases non-linearly with increasing EPS density. On the other hand, compressive stress at 10% deformation increases linearly with the increase of EPS density.

发泡聚苯乙烯 (EPS) 是一种刚性多孔塑料材料，具有充气封闭多孔结构，通过模制可发泡聚苯乙烯或其一种共聚物的珠粒或颗粒制成。EPS是一种良好的隔热材料，因此常被用作建筑物的隔热材料。在为建筑应用选择隔热产品时，最重要的因素之一是导热性。其他重要参数是水蒸气传输特性、吸水率和机械特性，包括 10% 变形时的压缩应力等。确定其中一些特性是一项艰巨的任务且耗时。密度测定是一种简单、快速且廉价的过程。一旦通过实验建立了这些特性和密度之间的关系，测量这些属性中一些与密度相关的值可以用一个很好的近似值来估计。在本文中，研究了 10% 变形时的压缩应力和热导率与发泡聚苯乙烯 (EPS) 密度之间的关系。对209个样品进行了测定国产EPS板10%变形时的密度、热导率和压应力的测试。实验结果表明，热导率随着EPS密度的增加呈非线性降低。另一方面，10%变形时的压应力随着EPS密度的增加而线性增加。研究了 10% 变形时的压缩应力和热导率与发泡聚苯乙烯 (EPS) 密度之间的关系。对209个样品进行了测定国产EPS板10%变形时的密度、热导率和压应力的测试。实验结果表明，热导率随着EPS密度的增加呈非线性降低。另一方面，10%变形时的压应力随着EPS密度的增加而线性增加。研究了 10% 变形时的压缩应力和热导率与发泡聚苯乙烯 (EPS) 密度之间的关系。对209个样品进行了测定国产EPS板10%变形时的密度、热导率和压应力的测试。实验结果表明，热导率随着EPS密度的增加呈非线性降低。另一方面，10%变形时的压应力随着EPS密度的增加而线性增加。