First, observe the color of the graphite polystyrene board. High-quality graphite polystyrene board is usually black or gray, and the color is uniform. If the color is too light, such as light gray or yellow-gray, and the surface is shiny, it may mean that the raw materials are unevenly mixed or there are quality problems during the production process, which will affect its thermal conductivity.
Secondly, check the surface flatness of the graphite polystyrene board. The surface of high-quality graphite polystyrene board should be flat and smooth, without obvious defects such as unevenness, cracks or bubbles. Such boards are more convenient to construct and can better ensure the insulation effect.
Furthermore, edge neatness is also an important indicator for judging the quality of graphite polystyrene board. Graphite polystyrene boards with neat edges can be better spliced during installation, reduce gaps, and thus improve thermal insulation performance.
Next, consider the density of graphite polystyrene board. Generally speaking, the density of graphite polystyrene board is more suitable between 18-22kg/m³. Graphite polystyrene board with moderate density can ensure good thermal insulation performance without being too heavy, which is convenient for construction and installation.
Thermal conductivity is an important indicator to measure the thermal insulation performance of graphite polystyrene board. The thermal conductivity of high-quality graphite polystyrene board is generally below 0.032W/(m·K). You can understand its thermal conductivity by checking the product test report or asking the manufacturer for relevant data.
In addition, the compressive strength of graphite polystyrene board should not be ignored. Graphite polystyrene board with a compressive strength of more than 150kPa is of good quality and can withstand pressure from walls, roofs and other parts.
Finally, the flame retardant grade is also an important aspect of judging the quality of graphite polystyrene board. According to national standards, the flame retardant grade of graphite polystyrene board is divided into B1 and B2, of which B1 is a flame-retardant material with higher safety. When purchasing, you should choose graphite polystyrene board with a flame retardant grade of B1.
By observing the color, checking the surface flatness, edge neatness, measuring the density, understanding the thermal conductivity, testing the compressive strength and checking the flame retardant grade, the quality of graphite polystyrene board can be judged more comprehensively.
