How is EPS insulation board produced?
EPS insulation board uses bead-like expandable EPS resin containing a foaming agent (pentane) as a raw material. The EPS beads are expanded from 0.5mm to 3-4mm in a foaming machine, and then aged. Heat molding in the mold of the molding machine to make a white body with a fine closed-cell structure. Then cut into a certain size EPS insulation board according to user needs.
Why does EPS insulation board have efficient insulation performance?
EPS insulation board is a thermoplastic material, containing 3-6 million independent closed air bubbles per cubic meter of volume, and the volume of air contained is more than 98%. Due to the low thermal conductivity of air (0.029), it is also closed It can not be convection in foam plastic, so EPS is made into a material with very good thermal insulation properties.
What is ordinary EPS? What flame retardant EPS insulation board? What's the difference?
The ordinary EPS insulation material has an oxygen index of less than 22, and it will catch fire when it is exposed to fire, and it will become stronger and stronger. The combustion performance level is B3 level, which is a flammable material. In order to improve the fire resistance of EPS, the oxygen index of EPS can be greatly increased by adding some flame retardants to ordinary expandable EPS resins. According to the flame retardant performance and the amount of addition, flame retardant EPS is divided into B2 level flame retardant EPS and B1 level flame retardant EPS. Flame retardant EPS is a self-extinguishing material, that is, flame retardant EPS will be ignited when exposed to open flames, but will extinguish itself after leaving the source of fire. Therefore, flame-retardant EPS is also called self-extinguishing EPS.
What is the oxygen index?
The oxygen index refers to the minimum oxygen concentration required for a sample to maintain stable combustion in a mixed gas flow of oxygen and nitrogen under specified conditions. The oxygen index was measured with an oxygen index meter。
Oxygen index is a method for evaluating the flammability of plastics and other polymer materials. Because the atmosphere we are in contains only 21% of oxygen, that is, the oxygen index is 21. When the oxygen index of the material is greater than 26%, it cannot be burned in ordinary air, that is, it is difficult to burn, so it is generally considered that the oxygen index <22 belongs to Flammable materials, whose oxygen index is between 22-27 is a flammable material, and oxygen index> 27 is a non-flammable material. In the 97th edition of the "Combustibility Classification Method for Building Materials", it is stipulated that the oxygen index of class B1 (flammable materials) is ≥26;
What is graphite EPS insulation board?
Graphite EPS insulation board is the latest generation of insulation material which is further refined by chemical method on the basis of traditional EPS. The graphite EPS insulation board can reflect and absorb infrared rays due to the addition of special graphite particles, so the thermal insulation performance is at least 30% higher than traditional EPS, the thermal conductivity can reach 0.032, and the combustion performance level can reach B1 level. Graphite EPS insulation board is more popular than traditional EPS because it has stronger heat insulation performance and fire resistance.
What are the consequences of using inferior EPS insulation boards?
The main performance of poor-quality EPS products we often encounter on construction sites are:
1) The bulk density of EPS is seriously insufficient. The density of EPS for construction must not be less than 15kg / m3. The use of low-density EPS will reduce the strength and easily deform. Plastering and cracking will occur on this EPS board. Therefore, the use of low bulk density EPS in external insulation systems will reduce the overall strength of the external insulation system and crack the surface layer, which will cause serious hidden dangers to the external insulation system.
2) Impersonate B2 \ B1 flame retardant EPS with ordinary B3 grade EPS. The use of this inferior thermal insulation board will reduce the fire resistance performance of EPS and increase the fire hazard of construction projects.
3) The solubility of EPS is not good. The cross section of the EPS insulation board with good solubility is that the foam particles are tightly and seamlessly fused. Twisting EPS foam particles by hand will not fall off. The EPS insulation board with poor solubility will fall off by twisting the EPS cross section by hand. This low-quality insulation board has low drawing strength.
4) In order to achieve the goal of not only reducing the use of EPS, but also achieving the bulk density, some EPS manufacturers add a substance called “weighting agent” to the EPS processing or directly incorporate fine quartz sand into the raw materials. The use of this inferior insulation board will reduce the EPS insulation performance, and will reduce the bonding strength with the polymer mortar.
What is the main application of EPS in construction engineering?
Due to its light weight, thermal insulation, and processed characteristics, EPS is used as insulation material in wall and roof insulation in construction projects; as a sandwich material, it is used for steel mesh panels (such as Shule boards) for interior partition materials and Color steel sandwich panel; as a decorative material, EPS is processed into various European-style art decorative components; as a moisture-proof material, it is used for moisture-proof of exterior walls below ± 0 in construction.
How long does the EPS insulation board last? What are the symptoms of aging?
EPS is widely used in the field of building insulation, beginning in Europe affected by the oil crisis in the 1970s and 1980s. It has been used for 30-40 years. The main characteristics of EPS insulation board aging are brittle and powdery material, yellow color and deformed outline. In use, as long as the EPS is prevented from being exposed to ultraviolet rays for a long time, it can effectively slow down the aging rate of the EPS and prolong its service life.