They are foam materials that have homogeneous cell structure, produced and used for thermal insulation. Polystyrene, the raw material of XPS, is extruded along the line to the desired thickness by extrusion process. Thanks to this production made under constant computer control, a stable cell structure with a homogeneous honeycomb appearance is obtained. Cells are interconnected from all sides. The air is trapped inside the cells. With immobile dry air; the best known thermal insulation is provided.
The surface of the material coming out of the line is configured in accordance with the needs in detail where the material will be used as an armored or rough surface.
Thanks to this structure, Ekstrude Polystyrene materials (XPS) do not absorb water and are not affected by moisture and have a justified advantage compared to other thermal insulation materials.
SUPERIOR FEATURES OF XPS:
• Low thermal conductivity value.
• Continuous and non-decreasing λ- thermal conductivity value thanks to its water absorption feature.
• Frost resistance.
• Thanks to its high compression and bending strength, its thickness does not decrease over time.
High modulus of elasticity and dimensional stability.
• µ value suitable for the usage place thanks to its optimum vapor diffusion resistance.
• XPS products can be used for recycling without mixing with other plastics.
• It can be cut with all kinds of cutting tools, it is not crumbly and does not cause any loss.
• It has closed porous cell structure.
2. XPS HISTORY
The first Extruded Polystyrene Foam was produced in the early 1940s for floating rafts on request for military purposes in America. As a result of its intensive use, these products, which were found to be highly resistant to water and moisture, were also noticed the thermal insulation specifications and their production continued for the purpose of thermal insulation. Extruded Polystyrene Foams, which started production in Europe in the 1960s, have been used safely in all buildings and engineering structures for more than 50 years. Today, the use of Extruded Polystyrene Foams worldwide is around 15-20 million m3 / year.
domestic production in Turkey in 1994, total production in başlamıştır.2005 700,000 m3 / year in 2008, while 1.6 million m3 / year is over. In parallel with the growth in the construction industry, an annual market growth of approximately 15-20% is realized. The market size in 2012 is over 3 million m3.
3. HOW TO MAKE XPS
They are foam materials that have homogeneous cell structure, produced and used for thermal insulation. XPS raw material polystyrene is produced as a foam under constant pressure by a continuous extrusion process with the help of a blowing agent. The sheeted product with closed cell structure is subjected to surface treatment in accordance with its usage area.
It allows the change of XPS product features to meet various application requirements with the variation of process parameters during its manufacture. Foam density (20-50 kg / m3) and compressive strength values (100-500 kPa) can be obtained. Thermal conductivity calculation value is produced in groups of 0.030-0.035-0,040.
4. XPS QUALITY
CPD in the construction industry within the European community (Construction Product Directive) CE marking of construction Turkey also used the XPS thermal insulation boards used in construction materials in accordance with Regulation must carry. The product testing frequencies specified in accordance with TS EN 13164 and the CE marking must be applied by the manufacturer to meet the requirements for the initial type test (ITT) and factory production control (FPC).
CE Procedure and XPS product labeling
According to EN 13164, CE marking is placed on XPS thermal insulation boards or labels on the packaging. Data in mandatory marking; product name, manufacturer, year of manufacture, fire reaction class, length, width, thickness, thermal conductivity and thermal resistance values. The ID key reports more product features. This identification key should contain all the product features required for the various applications. According to the European product standard EN 13164, the following definitions must be used.