BS EN 12962-2011 pdf download.Adhesives – Determination of elastic behaviour of liquid adhesives ( elasticity index ).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 923:2005+A1 :2008, Adhesives — Terms and definitions
EN 1067, Adhesives Examination and preparation of samples for testing
EN ISO 15605, Adhesives — Sampling (ISO 15605:2000)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 923:2005+A1 :2008 apply.
4 Principle
A specifically shaped and graduated spindle (see Figure 1) is dipped into the adhesive to be tested. The shaft of the spindle is attached to a motor rotating at a constant specified speed for a certain period of time. During rotation, the adhesive under test rises (in equilibrium to gravitation) up to a reproducible height on reading of the spindle shaft. The height (In millimetres) measured is taken as “elasticity index”,
5 Apparatus
5.1 Beakers, of 100 mm diameter, capacity about 1 000 ml (see Figure 1).
5.2 Spindle, with size and dimensions shown in Figure 1, with markings at 10 mm intervals and sub-
graduated to millimetres.
5.3 Mechanical or electronic stirrer, with the possibility of fine speed control.
5.4 Analytical balance, with scale divisions of 0.01 g.
5.5 Stopwatch, or other suitable timing-device with accuracy of 0,2 s or higher.
5.6 Temperature-controlled room or enclosure, capable of maintaining the sample and the necessary apparatus at (23,0 ± 0,5) °C.
6 Procedure
6.1 Carry out the determination ri duplicate.
BSEN 12962:2011
EN 12962:2011 (E)
6.2 A significant sample of the adhesive shall be taken in accordance with EN ISO 15605 and prepared for testing as described in EN 1067. Store the sample in a closed container and keep it in the temperature- controlled room (5.6) until the sample reaches (23 ± 2) °C (at least 30 mm).
In order to minimize evaporation of solvent, the operations from 6.3 to 6.8 shall be carried out in the shortest possible time.
6.3 Weight (200,0 ± 0,1) g of the adhesive under test into the beaker (5.1).
6.4 Place the beaker containing the adhesive under the stirrer (5.3) taking care to centre the beaker.
6.5 Dip slowly the spindle (5.2) into the adhesive avoiding trapping air bubbles In the liquid (for example hold the spindle at an angle of approximately 450 to the surface of the product and manually turn during the immersion).
6.6 Insert the spindle in the mandrel of the stirrer.
6.7 Regulate the spindle immersion until the liquid reaches the highest part of the cone: position zero, and lock the mandrel of the stirrer.
6.8 Protect the adhesive by covering the beaker with a properly shaped paper.
6.9 Start the motor set at the speed of (300 ± 10) mm1.
6.10 Start the stopwatch simultaneously with the motor and then stop both after (30± 1) s from the starting.
6.11 Read and note the height reached by the adhesive on the shaft of the spindle for the test report. Ignore any value exceeding 50 mm and the results of any tests during which an irregular, irreproducible behaviour of the adhesive on the rotating stirrer was stated. e.g. a “throwing° caused by centrifugal forces.
6.12 Clean the spindle with a suitable solvent (acetone, aliphatic hydrocarbons or ethanol) and repeat the measurement.
6.13 Take the average of the two values measured.
7 Expression of results
Express the “elasticity index” as the mean of the duplicate determination (6.11) in millimetres rouiioeó to the nearest 1 mm.
8 Test report
The test report shall include:
a) a reference to this European Standard, i.e. EN 12962;
b) all details necessary for a complete identification of the adhesive tested:
C) any circumstances which may have affected the result:
d) the test results according to Clause 7, individual and mean values;
e) date of the test.BS EN 12962-2011 pdf download.