In compression tests, the test piece is clamped and supported during the test and the compression span is always kept short to prevent buckling. These tests are commonly referred to as 'crush' tests, as the test sample An example of some of the crush testing equipment used at Smithers laid flat on a table. is crushed between platens. There are five main types of tests:
Concora Crush Testing (CCT)
Corrugated or 'Concora' crush testing measures the edgewise compression strength of a laboratory-fluted strip of a corrugating medium. We measure CCT in accordance with Tappi T824, and results are quoted in kN/m.
Concora Medium Testing (CMT)
The corrugating or 'Concora' medium test determines the flat crush resistance of a laboratory-fluted strip of a corrugate medium.
Smithers measure CMT in accordance with BS EN ISO 7263. The results are quoted in N.
Edgewise Compression Testing (ECT)
Edge crush testing is a measure of the load bearing capability of corrugated fibreboard to loads acting parallel to the fluting. Results are quoted in kN/m.
Smithers test to British Standard BS EN ISO 3037 and International Standard ISO 3037.
Flat Crush Testing (FCT)
Flat crush testing is a measure of the load bearing capability of corrugated board to loads acting perpendicular to the fluting. Results are quoted in kPa.
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