Home > News / Media > Content

Performance Comparison Between XPS And EPS

Dec 17, 2018

XPS Foam Board and EPS Foam Board are the main insulation materials for exterior wall insulation. Today, we can tell their differences and advantages.

1. Thermal insulation performance:

The thermal insulation performance of EPS and XPS with the same thickness increases gradually. EPS is 0.041 and XPS is 0.030. Therefore, to achieve the same thermal insulation effect, the thickness of XPS Foam Board is thinner than that of EPS plate, but the price of pure plate is higher than that of EPS plate. If the overall consideration of technology and building height, the price per square meter of XPS is cheaper than EPS.

For thermal insulation, it mainly depends on the thermal inertia index D, and the D value is proportional to the thermal storage coefficient. But as far as the whole system is concerned, the 200 mm concrete heat storage has been large enough, plus external insulation layer, fully meet the requirements of energy saving. This is also the reason why the comprehensive thermal conductivity and thermal storage coefficient of the wall should meet the requirements at the same time. EPS or XPS thin plastering system fully meet the requirements.


2. Strength:

It is pointed out here that the strength should be tensile strength. There is an absolute relationship between the bulk density and the tensile strength of the polyphenyl board. The tensile strength of the EPS with the bulk density of 18Kg/m3 is 110-120KPa, and that of 20Kg/m3 is about 140 KPa. The bulk density of XPS is normal from 25 Kg to 45 Kg, and the strength is 150 KPa to 700 KPa or higher. (The premise is that the thermal conductivity is about 0.03).

The strength of XPS Foam Board is 200 KPa-250KPa. Most of the XPS Foam Board manufactures in China are between 100 and 200 kpa. The EPS board is below 100 KPa. Under the circumstance of more and more abundant facade decoration and typhoons in coastal areas, the strength is very important. Especially for some exterior wall tiles or high-rise buildings, the two kinds of plates need to be strengthened or fixed with fixtures. The drawing of ceramic tile is more than 400KPa, even XPS can not bear. The solution is to expand bolt and anchor the wire mesh to the base, which can disperse the tension stress to the three-dimensional space. So as long as the anchorage is proper, the drawing damage must be in the anti-cracking mortar layer of the composite wire mesh, which is not a big problem.

Compared with EPS, the strength of XPS Foam Board is higher, but compared with XPS, because of the nature of EPS board (brittleness), when the paste area is larger, the possibility of cracking of exterior wall decoration layer is higher, especially the coating layer. Flexibility is a matter of material quality. For smearing, perceptual knowledge usually applies the smearing batch on the polyphenyl board, and then see how much the polyphenyl board bends and the surface does not appear cracks. If the flexibility is good, bending several circles will not crack. It is similar to the ductility index in waterproof materials. But as far as materials are concerned, flexible EPS is better than XPS.


3. Air permeability:

Air permeability and water absorption are two problems! The size of air molecule is quite different from that of water molecule. There is, of course, the saying that it is breathable and impermeable. There are experiments to illustrate this point. For example, when you put a biscuit on the beach, you don't need to water it. In a day, the biscuit will soften because it absorbs water, which is water in the air rather than liquid water.

In the thermal insulation system, no product dares to claim that its products have good air permeability, good thermal conductivity, good waterproofing performance, and not absorbent, good things occupy a whole. Because these indicators are contradictory, and the permeability also pays attention to the permeability after wet water in the construction process and the permeability after the completion of the system.

However, the new XPS extrusion board, whose material itself does not absorb water, and its thermal conductivity is lower than all the existing insulation materials, is the best thermal insulation material for energy-saving building promotion in the country. In the construction, after using bonded mortar and special mesh cloth and plastering mortar, the phenomenon of condensation can be completely eliminated. If the XPS Foam Board is exposed in the outer layer, no matter what material the insulation board is exposed in the space, there will be the possibility of condensation. However, as the insulation material itself, there is no problem of condensation at all.


4. Weatherability:

Weatherability refers to the adaptability of thermal insulation system to the changes of external weather. It refers to a series of quality problems such as the overall stability of the system and the change of thermal insulation effect under different climatic conditions. Weatherability is a very important index of thermal insulation system.

Because EPS board has higher water absorption compared with XPS, its weatherability is not as good as XPS system. However, the ductility of EPS board is better than that of XPS Foam Board, and some defects can be overcome. However, as far as the system is concerned, the coating glue on the outer layer of the thin plastering system itself also has a certain waterproof ability. Except in the construction process, the waterproofing performance of the two systems is good. Rainwater on the outside wall and wall contact is vertical, as long as the surface mortar does not crack, waterproofing is no problem.

In addition, the wind pressure resistance is also an important part of weatherability, because the more the system has a cavity, the worse the wind pressure resistance. So the key point is the bonding area between the whole insulation system and the base. There is no problem with XPS system and EPS system.


5. Bond strength:

For thin plastering system, this index will directly affect the use of sheet metal.EPS board has low strength, shear strength is also low. Plate damage may not occur on the bonding surface, but directly in the middle of the sheet. XPS Foam Board has better strength performance. Tensile strength of 0.1 MPa is equivalent to 10 tons of force per square meter, which is very large.

XPS Foam Board, a lot of use is embossing slotting, the most conducive to use, this surface treatment method, kalshine can provide a variety of surface treatment equipment, slotting machine, wool beater has beautiful stamping machine, equipment stability.

6. Surface smoothness

XPS Foam Board surface smoothness depends on the raw materials and production equipment. Kalshine provides high-quality molds and equipment to ensure the surface smoothness of the plate. As a new technology, staggered joint bonding has been popularized. Alkali-resistant mesh cloth is used on the surface of XPS Foam Board. After fixing with special anchorage parts, after using special plastering mortar, the smoothness of the wall surface is much better than that of EPS system in the past.


7. Service life

XPS Foam Boards have high performance. The service life of general XPS Foam Boards ranges from 60 to 80 years, which is much higher than that of EPS boards.


8. Environmental Protection Performance

EPS is not environmentally friendly in the production process, it will remove a lot of waste and gas, which has a great impact on the surrounding environment.


9. Technical Maturity

Kalshine professionals have been engaged in XPS Foam Board production and sales for more than 10 years. They have rich experience. If you have any questions, please contact us at market@kalshine.com.


10, price

The price of XPS Foam Board is higher than that of EPS Foam Board.

From: www.kalshine.com