BS/EN 12310-2-2018 pdf download.Flexible sheets for waterproofing – Determination of resistance to tearing
Part 2: Plastic and rubber sheets for roof waterproofing.
EN 13416:2001, Flexible sheets for waterproofing — Bitumen, plastic and rubber sheets for roof waterproofing — Rules for sampling
3 Term and definition
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain term inological databases for use in standardization at the following addresses:
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• ISO Online browsing platform: available at http://www.iso.orglobp
resistance to tearing
maximum tensile force required to tear a pre-cut test specimen
4 Principle
The principle of the test is measurement of the force required to completely tear the test specimen, in continuation of the cut or nick already produced in the test specimen.
The tearing force is applied by means of a tensile testing machine at a constant speed until the test specimen breaks. The maximum peak force achieved is reported.
S Apparatus
Tensile testing machine equipped with a continuous recording of force and corresponding extension and capable of maintaining a uniform speed of grip separation as specified below.
The tensile testing machine shall have a sufficient loading capacity of at least 2 000 N and a grip separation speed of (100 ± 10) mm per mm. The width of grips shall not be less than 50 mm.
The tensile testing machine shall be equipped with grips of a type which maintain or increase the clamping pressure as a function of the increase of the force applied to the test specimen. The test specimen shall be held so that it does not slip in the grips more than 1 mm for products up to and including 3 mm thick, and 2 mm for thicker products. A mark or tape on the test specimen where it enters the grips will help reveal any slip.
The force measuring system shall meet at least Class 2 of EN ISO 7500-1 (i.e. ± 2 %).
The template used for cutting the test specimens shall have dimensions as shown in Figure 1.
6 Sampling
Samples shall be taken in accordance with EN 13416:2001.
7 Preparation of test specimens
The shape and dimensions of the test specimens are given in Figure 2. The angle a shall be produced with an accuracy of 10.
Specimens as shown in Figure 1 shall be cut from the product to be tested. Using the template cut five specimen for each (longitudinal and transversal direction). They are taken parallel and transverse to the manufacturing direction (machine direction) of the film or sheeting so as to permit determination of the tear resistance in both directions as defined by the direction of the incision.
Mark on every test specimen the lines indicating the position of the grips.
Condition the test specimens, prior to testing, for at least 20 h in a standard atmosphere of (23 ± 2) °C
and (SO ± 5) % relative humidity.
8 Procedure
The test specimen shall be tightly clamped in the tensile testing machine grips (Clause 5) taking care that the lines (thin lines in the Figure 3) are aligned with the front edge of the grips.
The test is carried out on a test specimen at a temperature of (23 f 2) °C and at a constant separating speed for the grips of (100 ± 10) mm/mm.
The maximum applied tensile force shall be recorded for each test specimen.
9 Expression of results
9.1 Evaluation
State (or each test specimen the maximum torce in Newton.
Disregard any result where the test specimen slips by more than the permitted limit within the grips of the tensile testing machine, and retest with a replacement specimen.
Calculate for each direction the arithmetic mean tear force (FL and Fr) in Newton and state the result to the nearest Newton.
9.2 Precision of the test method
No information is available at this time.
10 Test report
The test report shall include the following information:
a) a reference to this European Standard (EN 12310-2) and any deviation from it;
b) all details necessary to identify the product tested;
c) information on sampling in accordance with Clause 6;
d) details of preparation of the test specimen in accordance with Clause 7;
e) the test results in accordance with Clause 9;
f) any peculiarities in the method employed or encountered during the test;
g) the date of the test(s).BS/EN 12310-2-2018 pdf download.