One of the most common test methods of the packaging industry in India is the Bursting Strength Test. The bursting strength of combined board is primarily an indication of the character of the materials used in manufacturing a fiberboard box and has value in this respect. There is a general misconception that a higher BS means a better carton.
Unfortunately this is a “Material Test” only and doesnot in any way guarantee the performance of the shipper carton formed out of such material. You can have a lower BS corrugated carton having a better compression strength than a high BS carton.
International standard specify that Triple-wall corrugated board (7 Ply) cannot be tested suitably by the bursting method. Testing of double-wall board (5 Ply) is of questionable accuracy since it is rarely possible to get sufficiently simultaneous bursts of the multiple facings.
The test is simple and rapid to execute, but it must be recognized that it is subject to serious errors if instrument, diaphragm, and gauges are not properly maintained or if improper procedures are used.
Test Method :
The test specimen is clamped in a BS Tester and gradually increasing hydrostatic pressure is applied perpendicular to the face of the sample through a rubber diaphragm till the sample cannot bear the pressure and bursts. The peak burst pressure is recorded as the Bursting Strength.