ISO 4898:2018 pdf free

ISO 4898:2018 pdf free.Rigid cellular plastics一Thermal insulation products for buildings一Specifications
Density measurement is optional for all materials in countries where a system of class identification has been established.
Density shall be determined in accordance with ISO 845 on each of 10 full-size boards and reported as the average of the 10 specimens. The average density of the 10 specimens shall be equal to or greater than the minimum required and no single specimen shall be less than 90 % of the minimum requirement.
When the natural skin of the material forms an integral part of the product in its end use, the surface skin shall not be removed prior to the determination of the density. For those materials with surface facing, lamination or coating, the density shall be determined for the core material after removing such facing, lamination or coating.
The compressive strength or the compressive stress at 10 % deformation or yield, whichever occurs first, shall be determined in accordance with ISO 844. Specimens shall be tested with natural skin integral to the final product, surface facing, lamination or coating, unless surface irregularities require removal of such surfaces for uniform loading.
The thermal conductivity shall be determined in accordance with ISO 8301 or ISO 8302 at a mean temperature of either 23 °C or 10 °C. Thermal-conductivity values measured at one of these mean temperatures may be used to calculate the mean value for the other temperature on the basis of a documented thermal conductivity versus mean temperature relationship. In cases of dispute, the thermal conductivity shall be determined at the mean temperature for which the value is reported.
Cellular plastic insulation manufactured with the intent to not retain a blowing agent, other than air,for a period longer than 180 days shall be tested after conditioning for a minimum period of 28 days.
All cellular plastic insulation manufactured with the intent to retain a blowing agent, other than air, for a period longer than 180 days shall have the long-term thermal resistance determined in accordance with ISO 11561. When measuring the thermal resistance, the temperature difference across the specimen shall be 23 °C.ISO 4898 pdf free download.