Standard Laboratory Test Methods for Paperboard Physical Property Verification
Paperboard physical property verification requires strict ISO 187 conditioning and standardized test methods to ensure compliance and prevent customs holds.
TAPPI T 807
Standard Procedure
Standard testing procedures established by international packaging associations define the methodology for measuring the bursting strength of paperboard and linerboard. The protocol designated as tappi t 807 specifies the design of the hydraulic tester and the rubber diaphragm used to apply pressure. This test method ensures that the hydrostatic pressure is applied at a uniform rate to a clamped specimen until it ruptures.
It is widely adopted by paper mills and converters to verify the puncture and burst resistance of board used in transit packaging.
Measurement Method
Clamping pressure and diaphragm dimensions are strictly controlled under this test protocol. To achieve a valid tappi t 807 measurement, the operator must ensure that the board does not slip in the circular clamps. The pressure required to rupture the specimen is recorded in kilopascals to provide a consistent strength metric.
Compliance Requirement
Containerboard manufacturers rely on these standardized results to certify that their materials meet the strength requirements of carrier regulations. If the values derived from tappi t 807 tests fall below the specified limits, the paper machine operators must increase the refining of the fibres. This measurement process ensures that shipping boxes will protect their contents under high-stress distribution conditions.