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The Test summary
The test can be 2 compare The propagation hold of various plastic control-insistent pang and sheeting of comparable thickness. The Standard sized specimens are separated by a slit of half The length of The sample resulting in two "legs" which are torn apart at a constant speed while The tensile force is measured
The Test apparatus
Die cutter or cutting apparatus.
Micrometer reading to 0.0025 mm
The Force testing stand
Suitable range loadcell compatible with the force testing Stan
The Test method
1. If required, the pre - condition the samples as specified in ISO 291.
2. The At further five samples are required.
3. The Specimens are cut, ideally using a die cutter. The Sample may be cut in the longitudinal or transverse direction of the Sample
4. The thickness of The specimen is accurately measured in mm in several points, and an average value (d) is calculated.
5. Specimens are clamped with one "legs" in each of the grips of the force testing stand which are initially set 75 mm apart.
6. The test stand is set in motion at a fixed crosshead speed of 200 or 250 mm/min.
7. Continue the test until the tear has propagated through the - length of the - unslit length of the sample.
8. Measure the mean load (Ft) over a 50 mm interval of the tear disregarding the first 20 mm and 5 mm final portions of the force/short curve.
9. Calculate the Tear to hold the from the formula
Tear to hold = Ft/d - the report as newtons/mm
The Report
The test report shall contain:
All the information necessary for the complete identification of the sample o direction if appropriate and standards atmosphere, informs the for pre - conditioning if appropriate.
The test speed, informs
The average thickness of each specimen.
Report the arithmetic mean of the at further five samples from each set of test specimens, in newtons/mm
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