BS EN ISO 29470:2020,Thermal insulating products for building applications – Determination of the apparent density.
BS EN ISO 29470:2020 specifies the equipment and procedures for determining the apparent overall density and the apparent core density under reference conditions, This document is applicable to full size thermal insulating products and test specimens. This document can also be applied to the individual layers of multi-layered products.
Normative references
ISO 29466, Thermal insulating products for building applications- Determination of thickness;
ISO 29768, Thermal insulating products for building applications-Determination of linear dimensions of
specimens;
6 Test specimens
6.1 Dimensions of test specimens
The test specimens shall be full-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
arace 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.
en the shape or surface of the product is not rectangular and easy to measure and calculate, a resentative 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 be agreed between parties.