EN ISO 29470-2020 pdf download.

EN ISO 29470-2020 pdf download.Thermal insulating products for building applications – Determination of the apparent density [ISO 29470:2020). 6.1 Dimensions of test specimens The test specimens shall be lull-size products or parts of them or test specimens used for other tests. The shape of the test specimens shall be such that their volume can be easily calculated. When the apparent overall density is being determined using test specimens cut from a product with surface skins formed during production, the ratio of the area of the surface skin to the total volume for the test specimen shall be the same as the product. When the shape or surface of the product is not rectangular and easy to measure and calculate, a representative piece of the product shall be cut out. The size of a test specimen should be as large as possible, commensurate with the apparatus available and with the shape of the original product. The size of the test specimens may also be specified in other test methods. 6.2 Number of test specimens The number of test specimens for full-size products shall be as specified in the relevant product standard. If test specimens from other tests are used, the number shall be as specified in the test method. If the number is not specified, then at least five test specimens shall be used. In the absence of a product standard or any other technical specification, the number of test specimens may he agreed between parties. 6.3 Preparation of test specimens The test specimens shall be cut using a method that does not change the original structure of the product. The location from which the test specimens are taken shall be such that the density obtained is representative of the density of the product. For determining the apparent overall density, any facings and/or coatings shall he removed from the product. For determining the apparent core density, any surface skins formed during production and any facings and/or coatings shall be removed from the product. When it is not possible to remove the facings and/or coatings without influencing the apparent density of the product, the mass of the facings and/or coatings shall be deducted by calculation. NOTE Special methods of preparation, when needed, are given in the relevant product standard. 6.4 Conditioning of test specimens The specimens shall be conditioned at (23 ± 2) °C and (50 ± 5) % relative humidity (RI-I)...