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Monday, June 20, 2016

Comparison of Paper and Board Burst Tests

Bursting strength is measured by a test methods where a specimen is held between annular clamps and subjected to pressure from one side. The portion of the specimen exposed between the openings is the test area. The portion of the specimen around the test area is clamped rigidly so that it does not slip as the test area bulges under the increasing pressure during the test. Pressure is applied to the underside of the specimen by a rubber diaphragm which is expanded by hydraulic pressure at a controlled constant rate. The bursting test value is the maximum pressure, above atmospheric pressure, in pounds per square inch (or kilonewtons per square meter or kilopascals) required to produce rupture of the specimen. There are separate test methods for paper burst and board burst.

TAPPI T 403 & ISO 2758 TAPPI T 807, T 810 & ISO 2759
Mullen Model C Mullen Model A
Application paper & paper products T 807 linerboard
T 810 single & double wall corrugated
Diaphragm 30 - 35 kPa to distend 160 - 210 kPa to distend
0.375 in (9 mm) 0.375 in (9.53 mm)
Diaphragm opening (diameter) 1.2 in (30.5 mm) 1.24 in (31.5 mm)
"Upper" Clamping Plates (minimum diameter) 48 mm 3.75 in (95.3 mm)
Rate of pressure increase 1.6 mL/s [96 mL/min] 170 mL/min (5.75 oz/min)
Clamp pressure   Adjustable 600 - 1000 kPa
Measurement Range (bursting strength) 50 - 1200 kPa ( 7 - 175 psi) 350 kPa (51 psi) and up

There are some small differences in the TAPPI and ISO Standards, but they have been minimized over the years to make them as close as possible. The primary take away is that there are two different devices for measuring paper and board burst. Each has its own requirements for clamping size, clamping force and diaphragm.