When you start shopping for EPS Cement Sandwich Wall Panel, you will quickly notice that different suppliers offer products with very different prices, and the biggest difference between cheap and high quality panels is the material and quality of the inner core. Many low cost suppliers cut corners on the core material to reduce production cost, which leads to serious performance problems after a few years of use. This guide breaks down the different core material options, so you can tell the difference between good and bad products easily.
The standard high quality EPS Cement Sandwich Wall Panel uses closed cell expanded polystyrene foam as its core, with a density of no less than 18kg per cubic meter. This core material has extremely stable physical properties, it will not shrink, deform or lose insulation performance for more than 25 years, and it has a thermal conductivity rating as low as 0.032 W/mK. Many low quality cheap panels on the market use very low density 8kg to 10kg recycled EPS foam core, which looks the same when new, but will start to shrink and create gaps inside the wall after 2 to 3 years, causing cracks on the wall surface and completely losing thermal insulation performance.
Some suppliers also sell modified versions of EPS Cement Sandwich Wall Panel with upgraded core materials for special applications. For projects that need extra high fire resistance, there are panels with a core made from EPS foam mixed with inorganic fire retardant additives, which passes the national B1 fire rating standard. For projects that need extra high sound insulation, you can select panels with a composite core that combines EPS foam with a layer of high density sound absorbing mineral wool, achieving sound insulation performance above 55dB. You should never buy panels where the supplier cannot tell you the exact core density and material composition, these low quality products will almost always create expensive hidden problems for your project in the near future.
