What is the relationship between Gurley stiffness units and Taber stiffness units?
Up until the late 1960’s there was little information available about the precision statement for the Taber stiffness tester. In June 1969, an article was published in TAPPI Journal which summarized interlaboratory evaluation involving 24 Taber stiffness testers in 15 laboratories (Verseput, H.W., “Precision of the Taber Stiffness Test,” Tappi 52 (6):1136 (1969). He further continued his study to develop an empirical correlation between the Taber and Gurley stiffness testers, based upon 183 paired tests on paperboard in a single laboratory. The Taber 100 and 500 g-cm scales were used.
