A test piece, placed over a circular elastic diaphragm, is rigidly clamped at the periphery but free to bulge with the diaphragm. Hydraulic fluid is pumped at a constant rate, bulging the diaphragm until the test piece ruptures. The bursting strength of the test piece is the maximum value of the applied hydraulic pressure.
The pneumatic clamping in such a way the clamping pressure against the specimen can be corrected by the adjustment of air pressure regulator. It is important that the specimen is clamped so hard so that it does not slip during testing. The standard clamping pressure is 3.0 kg/cm2.
A bursting strength tester of the hydraulic type consisting of : Two clamping plates upper and lower clamping and parallel surfaces having a a central circular opening. The lower edge of the opening, Which makes contact with the test piece is slightly rounded, but not so much as to effect the area of the aperture. The pressure is generated by a motor driven piston which forces a liquid contain no air. The motor direction reverses automatically after the sample burst.for instance, pure air free glycerol (96%) or ethylene glycol into a pressure chamber beneath the diaphragm at a rate of 2.9ml/s ± 0.1 ml/s. The hydraulic system designs in such and
Note : Glycerol is preferred to ethylene glycol as the hydraulic fluid because its higher viscosity.
Electronic Bursting Strength Tester meets the requirements laid down in the testing standards as per TAPPI standards.