Bursting Strength
The bursting strength of paper or paperboard is a composite strength property that is affected by various other properties of the sheet, principally tensile strength and stretch. Generally, bursting strength depends upon the kind, proportion, and amount of fibers present in the sheet, their method of preparation, their degree of beating and refining, upon sheet formation, and the use of additives.
Bursting factor is measured by means of a Mullen tester. The test specimen, held between annular clamps, is subjected to an increasing pressure by a rubber diaphragm, which is expanded by hydraulic pressure at a controlled rate, until the test specimen ruptures. The pressure reading at the instant of rupture is recorded as the bursting strength. The units of expression are pounds per square inch or "points". The measurement is variously termed the "Mullen", "pop test", or simply the "burst". The burst test for paperboard differs from that of lighter papers in that a heavier Mullen tester is used with a larger diaphragm opening.
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By: www.goodrichworld.com
