External wall insulation material is a material used for building wall insulation, not only for winter heating, but also for building insulation. It is often used in new buildings and energy-saving renovation projects to improve wall insulation performance and indoor thermal stability. The performance of thermal insulation materials affects whether the building is energy-saving or not, and is an integral part of the building thermal insulation system. So, what are the non-absorbent insulation materials?

　　There are many kinds of thermal insulation materials, and there are many choices. According to the composition materials, they can be divided into two types: inorganic thermal insulation materials and organic thermal insulation materials. Common insulation materials are: expanded polystyrene board (EPS board), extruded polystyrene board (XPS board), rubber powder polystyrene particle insulation slurry, polyurethane foam material, rock wool board and vacuum insulation board.

　　The non-absorbent thermal insulation material is glass wool, which has good fireproof, thermal insulation and thermal insulation performance; good sound insulation performance, low water absorption; high compressive strength, strong cohesion, and the same life as the building; simple construction, short cycle; energy saving Environmentally friendly and conducive to recycling, it is widely used in fire isolation belts, exterior walls, roofs and other construction fields. Uetersen glass wool has high hydrophobicity after treatment, and is a new material that does not absorb water. To a certain extent, prevent rainwater from penetrating the wall, improve the moisture-proof performance of the wall, avoid indoor condensation, mildew and other phenomena, so as to create a comfortable indoor living environment.

　　The thermal conductivity of the thermal insulation material will increase when it absorbs water. If the veneer of the glass wool is damaged during use, water vapor will enter the interior of the glass wool, affecting the durability and thermal insulation effect of the glass wool. Water vapour adhesion works on the same principle as water vapour condensing on walls to form water droplets. Therefore, when purchasing glass wool, you should choose a thermal insulation material that has undergone hydrophobic treatment or low water absorption, so as not to increase the thermal conductivity of the material after absorbing water, which will affect its performance.