EN 1608-2013 pdf download.Thermal insulating products for building applications – Determination of tensile strength parallel to faces.
This EN 1608 specifies the equipment and procedures for determining the tensile strength of a product parallel to its faces. It is applicable to thermal insulating products.
This European Standard can be used to determine whether the product has sufficient strength to withstand stresses during transportation and application.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 823, Thermal insulating products for budding applications — Determination of thickness
EN 12085. Thermal insulating products for building applications — Determination of linear dimensions of test specimens
ISO 5725-1, Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
3 Terms and definitions
For the purposes of this document, the following term and definition applies.
3.1
tensile strength parallel to faces
maximum recorded tensile force parallel to the product faces during the pufling operation, dMded by the cross-sectional testing area of the test specimen
4 Principle
A test specimen is attached to two clamps which are fastened in a tensile testing machine and pulled apart at
a given speed.
The maximum tensile force is recorded and the tensile strength of the test specimen is calculated.
5 Apparatus
5.1 Tensile testing machine, appropriate for the range of force and displacement involved, capable of having a constant crosshead speed adjusted to (10 ± 1) mm/mm and capable of measuring the force to an accuracyof±1 %.
5.2 Two clamps, designed so as to avoid failure of the test specimen in the area of the clamps. The clamps shall be positioned so that the tensile stress is uniformly distributed during the test.
An example of suitable equipment is shown in Figure 1.
Any test equipment or method which provides the same result with at least the same accuracy may be used.
6 Test specimens
6.1 Dimensions of test specimens
The thickness of the test specimens shall be the original product thickness including any skins, faangs, and/or coatings. The test specimens shall be cut with the shape and with the dimensions shown in Figure 2. For small products or because of equipment limitations, the test specimen length and width shall be adjusted proportionally, but with a minimum length of 500 mm.
Other specimen shapes which provide the same result to at least the same accuracy may be used
6.2 Number of test specimens
The number of test specimens shall be as specified in the relevant product standard. If the number is not specified, then at least three test specimens shall be used.
Test specimens shall be prepared by methods that do not change the original structure of the product.
Special methods of preparation, wtieri needed, are given in the relevant product standard or any other
European Technical Specification.
6.4 Conditioning of test specimens
The test specimens shall be conditioned for at least 6 h at (23 ± 5) °C. In case of dispute, they shall be conditioned at (23 ± 2) C and (50 ± 5) % relative humidity for the time stated in the relevant product standard.
7 Procedure
7.1 Test conditions
Testing shall be carried out at (23 ± 5) °C. In case of dispute. it shall be carried out at (23 ± 2) °C and (50 ± 5) % relative humidity.
7.2 Test procedure
Measure the thickness of the testing area, d, to the nearest millimetre, in accordance with EN 823.
Measure the length of the test specimen, 1, and the width of the testing area, I,, to the nearest millimetre, in accordance with EN 12085.
Attach the test specimen centrally between two clamps to distribute the stress uniformly. Place it carefully in the tensile testing machine and increase the tensile force with a constant speed of the crosshead (see 5.1) until failure occurs.
Record the maximum tensile force, in kilonewtons.
Note the way in which the product failed. Discard any test specimens that failed outside the testing area (see Figure 2).EN 1608-2013 pdf download.