BS/EN 823-2013 pdf download.Thermal insulating products for building applications -Determination of thickness.
This BS/EN 823 specifies the equipment and procedures for determining the thickness of 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
thickness
d
linear dimension measured perpendicularly to the length and width plane
4 Principle
The distance is measured between a hard fiat reference surface on which the test specimen rests and a pressure plate resting freely on the top face of the test specimen.
5 Apparatus
5.1 Measuring device, comprising a dial gauge and a square pressure plate. An example of a suitable apparatus is given in Figure 1.
5.1.1 Dial gauge, capable of measuring to an accuracy of at least 0.5 mm1) and mounted on a rigid frame fastened to a flat rigid base plate which is at least as large as the test specimen.
5.1.2 Pressure plate. 200 mm square, which exerts a total pressure on the test specimen of either (50 ± 1,5) Pa or (250 ± 5) Pa (including the force exerted by the dial gauge).
The pressure shall be as given in the relevant product standard.
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, but it may be necessary to cut the product into pieces of appropriate size.
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.
6.3 Conditioning of test specimens
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.
6.4 Preparation of test specimens
Any facings or coatings shall be retained.
For compressed products, the preparation of test specimens shall be in accordance with Annex A.
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
Lay the test specimen carefully on the flat rigid base plate, ensuring that the measuring area is in contact with the base plate. Test specimens faced or coated on one side shall be placed with the facing or coating against the base plate. Place the pressure plate on the test specimen, exerting a total pressure of either (50 ± 1,5) Pa or (250±5) Pa at a designated position with the dial gauge centrally located.
Take two measurements for test specimens of lengths less than or equal to 600 mm. four measurements for test specimens greater than 600 mm and less than or equal to 1 500 mm in length, and one additional measurement for each additional 500 mm exceeding 1 500 mm in length.
Take the measurements d1. c12… and d at positions on the surface, as shown in Figure 2. Measure to an accuracy in accordance with 51.
8 Calculation and expression of results
The thickness of the test specimen shall be expressed in millimetres. to the nearest millimetre. as the mean
value of the measurements made at all the points for the test specimen (see Figure 2)1). 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 Indude 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 density.BS/EN 823-2013 pdf download.