For construction applications the properties of EPS are determined according to a set of harmonised European Standards or BS ENs. BS EN 13163 is the base standard for EPS (see below) www.bsi-global.co.uk
The low, stable, thermal conductivity of EPS is the reason for its important use in reducing the carbon dioxide (CO2) emissions in our buildings. This vital property is declared as a 90/90 value defined in BS EN 13163 to represent 90% of production with a statistical certainty of 90%.
Other properties, for example compressive strength or tensile strength, can be declared at a variety of levels independently of each other. However in reality the number of standard products is relatively small and a typical range of properties is shown in the table below:
The table gives typical properties for the traditional white EPS. A detailed explanation of all properties can be found in The White Book published on line at www.eumeps.org
In recent years developments have taken place to introduce a grey product which has the advantage of a lower thermal conductivity giving a 20% improvement in thermal resistance.
A thermal conductivity of 0.030W/mK can be achieved for EPS 70 or 100.
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