EN 825-2013 pdf download.Thermal insulating products for building applications Determination of flatness.
This EN 825 specifies the equipment and procedures for determining the deviation from flatness
for full-size products. It is applicable to thermal insulating products.
2 Normative references
This European Standard contains no normative references.
3 Terms and definitions
For the purposes of this document, the following term and definition applies.
3.1
deviation from flatness
maximum distance between the product placed on a flat surface with the convex side uppermost and the flat surface
4 Principle
The maximum distance between the product placed on a flat surface and the flat surface is measured.
5 Apparatus
5.1 FIat surface.
5.2 Metal rule or metal tape, graduated in millimetres and permitting reading to 0,5 mm,
5.3 Rigid frame Mth a movable measuring device consisting of a disc with a diameter of 30 mm, fixed to a graduated pin or a dial gauge (graduated to at least 0,5 mm) applying a load of (2,0 ± 0.1) N.
Any test equipment which provides the same result with at least the same accuracy may be used.
6 Test specimens
6.1 Dimensions of test specimens
The test specimen shall be the full-size product.
6.2 Number of test specimens
The number of test specimens shall be as specified in the relevant product standard.
In the absence of a product standard, the number of test specimens may be agreed between parties.
The test specimens shall be stored for at least 6 h at (23 ± 5) °C. In cases of dispute, they shall be stored at (23 ± 2) C and (50 ± 5) % relative humidity for the time specified in the relevant product standard.
7 Procedure
7.1 Test conditions
The test shall be carried out at (23 ± 5) C. In cases of dispute, it shall be carried out at (23 ± 2) °C and
(50 ± 5) % relative humidity.
7.2 Test procedure
7.2.1 Lay the test specimen with the convex face, if any, uppermost on a flat surface. If there is a visible deviation from flatness only along the length or on’y along the width, make the measurement in accordance with 7.2.2 (see Figures la and ib). If there is a deviation from flatness along both the length and width (warped products), make the measurement in accordance with 7.2.3 (see Figure 2).
7.2.2 Using the metal tape or rule, measure the maximum distance between the bottom edge of the specimen and the flat surface, Smax, to the nearest 0.5 mm.
7.2.3 Locate the maximum and minimum distances from the flat surface using the measuring device (see 5.3) as shown in Figure 2. At these positions read the distances and Y, to the nearest 0.5 mm. If the test specimen only rests on three points, the possibility of alternative flatness measurements exists and all shall be measured.
8 Calculation and expression of results
For test specimens with deviation from flatness in one direction only, report the deviation as the maximum value measured in millimetres.
For warped products, calculate the deviation from flatness, Sm, in millimetres, using the following formula:
Smax max — 1min
9 Accuracy of measurement
NOTE It has not been possible to indude a statement of the accuracy of the method in this edition of the standard, but it Is intended to Include such a statement when the standard Is next revised.
10 Test report
The test report shall include the following information:
a) reference to this European Standard;
b) product identification:
1) product name, factory. manufacturer or supplier;
2) production code number;
3) type of product;
4) packaging:
5) the form in which the product arrived at the laboratory;
6) other information as appropriate, e.g. nominal thickness, nominal density; c) test procedure:
1) pre-test history and sampling (e.g. who sampled and place of sampling);
2) conditiornng:
3) deviation from Clauses 6 and 7, if any:
4) date of test;
5) general information relating to the test:
6) any occurrences which may have affected the results. Information about the apparatus and identity of the technician should be available in the laboratory but it need not be recorded in the report;
d) results: all individual vahies and the maximum value of the deviation from flatness and the position where It occurred.EN 825-2013 pdf download.