1, thermal insulation performance:
The same thickness of EPS and XPS insulation performance is gradually increased. The EPS is 0.041 and the XPS is 0.030. Therefore, in the case of achieving the same insulation effect, the XPS board is thinner than the EPS board, but the XPS board is more expensive than the EPS board. If you consider the craft and the height of the building, the XPS per square meter is actually more expensive than the EPS.
For thermal insulation, the thermal inertia indicator D is mainly concerned, and the D value is proportional to the thermal storage coefficient. However, as far as the entire system is concerned, the heat storage of 200mm concrete is already large enough, and the outer insulation layer is added to fully meet the energy-saving requirements. This is also the reason why the national standard requires that the comprehensive thermal conductivity and heat storage coefficient of the wall meet the requirements at the same time. The EPS or XPS plastering system fully meets the requirements
The strength indicated here should be the tensile strength, and the bulk density and tensile strength of the polystyrene board have an absolute relationship. The general EPS bulk density of 18Kg/m3 is 110-120KPa, and the 20Kg/m3 bulk density is about 140KPa. The bulk density of XPS is normally from 25Kg to 45Kg and the strength is from 150KPa to 700KPa or more. (The premise is to meet the thermal conductivity of 0.03 or so).
XPS board strength 200KPa-250KPa, most domestic manufacturers XPS board basically 100 ~ 200kpa, EPS board below 100KPa, in the increasingly rich facade decoration and the typhoon often appear in coastal areas, the intensity is very It is important, especially for some exterior tiling or high-rises, that both plates need to be reinforced or fixed with fixing aids. The drawing of ceramic tile should be more than 400KPa. Even XPS cannot withstand it. The solution is to fix the steel wire mesh to the base layer by expanding the bolt. This can spread the tensile stress to the three-dimensional space, so as long as the anchor is properly anchored, the pull-out damage must be compounded. The crack resistant mortar layer of the steel mesh is not a big problem.
Compared with EPS, XPS board has higher strength, but compared with XPS due to the nature of the EPS board (brittleness), when the bonding area is large, there is a high possibility of cracking of the outer wall finish layer, especially the paint surface layer. Flexibility is a problem of wood properties. In the case of facial skin, perceptual knowledge is usually applied to a polyphenylene plate, and then the extent to which the polyphenylene plate is bent is not cracked. When the flexibility is good, it is bent several times. Will not crack. Similar to the ductility index in waterproof material. However, for the material itself, flexible EPS is better than XPS.
3, weather resistance:
Weather resistance refers to the ability of the heat preservation system to adapt to changes in the outside world, and refers to the series of quality related issues such as the overall stability of the system and changes in the heat preservation effect under different climatic conditions. Weatherability is a very important indicator of the insulation system.
Because EPS board has higher water absorption than XPS, its weather resistance is not as good as XPS system. However, the ductility of the EPS board is better than that of the XPS board, and certain defects can be overcome. However, as far as the system is concerned, the outer layer of the thin plastering system itself has a certain waterproof capacity. In addition to the construction process, the waterproof properties of both systems are good. The contact between rain and the wall on the wall is vertical. As long as the mortar on the surface does not crack, waterproofing is not a problem.
In addition, the wind pressure resistance is also an important factor in the weather resistance, because the more the system has a cavity, the worse the wind pressure resistance. Therefore, the focus will be on the size of the entire bonding area between the insulation system and the base layer. There is no problem with this XPS system and EPS system.
Breathable and absorbent are two problems! The size of air molecules and water molecules is very different! Of course there are breathable and impervious claims. Experiments can illustrate this. For example, in Shenzhen. Put the biscuits on the outside. You don’t have to water the biscuits. In a day, the biscuits will soften, because it absorbs water, which is the water in the air instead of the liquid water.
In the insulation system, no product dares to claim that its products have good air permeability, good heat conduction, good waterproof performance, and no water absorption. Because these indicators are contradictory, and breathability also pay attention to the permeability of wet water after the construction process and the system after the completion of the ventilation.
However, the new XPS extruded board, its material does not absorb water, and the thermal conductivity is lower than all existing insulation materials, is the country’s best insulation materials to promote energy-saving buildings. In the construction process, the use of adhesive mortar and special grid cloth and plastering of the xps board can completely prevent condensation. If the xps board is exposed in the outer layer, no matter what the material insulation board is exposed in the space, there will be condensation. Possibility, but because of itself as an insulation material, there is no problem of condensation at all.
5, bond strength:
For the thin plastering system, this indicator will directly affect the use of the board. The EPS board has low strength and the shear strength is also low. The board is damaged. It may not be on the adhesive surface, but is directly destroyed in the middle of the board. The XPS’s good strength performance is more assured. The tensile strength of 0.1 MPa corresponds to say that the tensile strength per square meter is 10 tons of force, which is very large.
Xps board, many of which are embossed slots, the most conducive to use, this surface treatment, the domestic manufacturers have already achieved, and some small manufacturers are still using a smooth surface xps board is manufacturing methods.
6, the surface roughness
The flatness of the surface of the XPS board depends on the production raw materials and production equipment. The original xps board is used. The flatness of the surface is much higher than that of the existing xps board using the secondary recyclable material, and the used surface is used to ensure the smoothness of the wall surface. Degree, in use, staggered seam adhesion has been promoted as a new technology, the use of alkali-resistant mesh cloth on the xps board surface, fixed with a special anchor, after the use of special plastering mortar, the flatness of the wall to be Far better than using EPS systems in the past.