1 Thermal conductivity: Different thermal conductivity […]
1 Thermal conductivity: Different thermal conductivity is produced due to the choice of materials of different materials. Due to the selection of materials with higher water absorption, the difference between the dry bulk density and the wet bulk density is very large. High-quality materials are generally 0.028-0.030 (W/m.k) for the selection of adiabatic insulation range; 0.038-0.042 (W/m.k) materials generally have a relatively high thermal conductivity value and can not achieve the energy-saving 65% standard.
2 Apparent density and compressive strength: The general XPS density is ≥30-38kg/m3, which is the industry standard value, which achieves both thermal insulation performance and ideal compressive strength. The difference is that it is not the heavier or lighter the product, but the product with high foaming ratio and good compressive strength is one of the ideal product choices.
3 Dimensional change rate: The dimensional change rate is derived from the relationship between the material foaming material and the expansion ratio and density. Good product, low dimensional change rate, small shrinkage and strong stability.
4 Water vapor permeability coefficient: material opening, semi-opening and complete closed hole forming different moisture absorption rate and different water vapor permeability coefficient.
5 oxygen index, fire protection standard is generally A grade non-combustible material. Such as rock wool, glass wool, etc.; and organic foam materials, generally flame retardant and flame retardant, belonging to the B class.
The above five standards are the preferred materials to pay more attention to technical parameters, the choice of materials should be preferred materials to quality standards, rather than blind pursuit of low price is a good product, affordable is the choice of materials.
Good choice of flame retardant extruded board
Selecting the flame-retardant extruded board, the first depends on its density, that is, the bulk density, the bulk density, the uniform and fine cells, the first proof of the insulation of the extruded board, the second depends on the compressive strength, high compressive strength and small bulk density. It's always the perfect combination of extruded boards, but unfortunately the two are often difficult to combine, so other criteria can only be chosen to determine if both standards are met. Third, look at the color, listen to the sound, the texture is white, no discoloration, the extruded and uniform cell is generally made of raw material resin, the quality is of course good, and the quality of the extruded board produced by different recycled materials is also very different. Extrusion plates that are too brittle and have no strength in handcuffs are generally of poor quality. Fourth, the extruded board with sufficient size and convenient construction is naturally trusted. Fifth, the flame retardancy test, even a simple lighter can be distinguished from the flame retardancy if it is rigorously tested.