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Standard: |
TAPPI |
Method: |
TAPPI T 810 |
Title: |
Bursting strength of corrugated board |
The TAPPI T 810 Bursting strength method describes a procedure for measuring the bursting strength of single wall and double wall corrugated board within the range of 690 kPa (100 psi) to 4825 kPa (700 psi) employing an instrument which uses a disk shaped, molded diaphragm.
A specimen of board is clamped between two platens with circular opening in their centers. The lower platen is fixed; the upper platen has an adjustable depth but remains stationary for the duration of the test. An expansible diaphragm is distended through the lower platen by means of hydraulic pressure until the specimen bursts. The maximum hydraulic pressure when the specimen ruptures, is recorded.
For the bursting strength of paper, see TAPPI T 403 “Bursting Strength of Paper,” and for linerboard see
TAPPI T 807 “Bursting Strength of Linerboard.” This method is not applicable for triple wall corrugated board.
The minimum bursting strength of corrugated board is a requirement of various carrier and governmental specified regulations for shipping containers. While bursting strength is an empirical property, this test, in combination with grammage (basis weight), serves to define some of the “standard grades’ in commerce. The bursting strength test of corrugated board is a composite measure of certain properties of the board structure, principally tensile and elongation of the linerboard (facings and any non-corrugated interior papers) comprising the combined board. In general, bursting strength is dependent on preparation and amount of fibers present in the sheet and on their formation, internal bond and, to some degree, the surface treatment and combining operation.
Bursting strength is the measure of the force required to puncture through (rupture) the corrugated board. It is often compared to edge crush strength (ECT: T 811, T 839), which is a measure of the compressive force a sample of the board can sustain in its vertical or loading direction before collapsing. While both are material properties of the corrugated board, depending on the papers used and how they are combined together, they measure different things. They are not exclusive or contradictory properties, nor can they be directly related one to the other. While they both can be used to describe corrugated board, the different measurements emphasize the importance of different board properties that may be relevant to the transport environment.
Testing of double-wall board is of questionable accuracy since it is rarely possible to get sufficiently simultaneous bursts of the multiple facings. Some advocate crushing double-wall board before testing to reduce or eliminate the multiple “pops” of the structure. This will typically result in higher values than on uncrushed board.
IPS can test samples up to 1,000 psi. Basis weight is required for Burst Index Values.
Please note:
SGS-IPS cannot sell or otherwise provide standards, specifications, or test procedures to third parties.