ISO 16534-2020 pdf free download – Thermal insulating products for building applications — Determination of compressive creep.
Test specimens shall not be layered to produce a greater thickness for testing.
The test specimens shall be cut squarely and have sides with the following recommended dimensions:
— 50 mm × 50 mm; or
— 100 mm × 100 mm; or
— 150 mm × 150 mm; or
— 200 mm × 200 mm or
— 300 mm × 300 mm.
The dimensions of test specimens shall be the same as used in the compression test as described inIS0 29469. These are specified in the relevant product standard or agreed between parties.
The linear dimensions shall be determined in accordance with IlSO 29768,to an accuracy of 0,5 %.The upper and lower faces of each test specimen shall be flat and parallel with a tolerance no greaterthan 0,5 % of its side length, up to a maximum of 0,5 mm.
7.3 Number of test specimens
The number of test specimens shall be as specified in the relevant product standard. lf the number isnot specified, then at least three specimens shall be used for each compressive stress selected from 8.2.NOTE ln the absence of a product standard or any other technical specification, the number of specimenscan be agreed between parties, provided the minimum requirement of three specimens are met.
7.4 Preparation of test specimens
The specimens shall be cut so that the direction of loading applied to the product will correspond to thedirection in which the compressive forces are applied to the product in use.
The test specimens shall be cut by methods that do not change the original structure of the product.lf the test specimen is not flat and parallel, it shall be ground flat and parallel or a suitable coating shallbe applied to prepare the surface for the test. If a coating is applied, any creep which occurs within thecoating shall be taken into account by deducting the creep of the coating.
Special methods of preparation, when needed, can be provided in the relevant product standard.
7.5Conditioning of test specimens
The test specimens shall be conditioned for at least 24 h at (23 ±2)°C and (50± 5)% relative humidity(RH). In case of dispute, the time for conditioning (equilibrium of moisture content) shall be as specifiedin the relevant product standard.
ln tropical countries，the local environment can necessitate different conditioning and testingconditions.In such cases, the conditioning shall be performed at (27 ± 2)°C and (65± 5) % RH and bestated clearly in the test report.
8Procedure
8.1Test conditions
The test shall be carried out at (23 ±2) °C and (50± 5) % RH.
other conditions can be given in the relevant product standard or can be agreed between parties.
n tropical countries, the local environment may necessitate different conditioning and testing conditions. In such cases, the testing shall be performed at (27 ± 2) °C and (65 ± 5) % RH and be stated clearly in the test report.
8.2 Stress selection
The test shall be carried out at three or more different stresses.
To verify one defined level of stress only this level shall be used.
8.3 Test procedure
If the thickness of a test specimen, d s , is to be determined without using the loading device, it shall be measured to an accuracy of 0,1 mm, in accordance with ISO 29768.
Place the test specimen carefully in the test apparatus, under the ‘dead weight’ of the loading device.
The thickness under this load, d L , is the reference value for the deformation measurements. Determine d L to the nearest 0,01 mm.ISO 16534 pdf download.