0 u00b0 c 73 4 u00b0 u00b1 1 8 u00b0 f at 50 relative humidity for 2 hours the crosshead speed of the tensile tester is generally set to 2 0 in per minute the jaw span is 3 inches the specimen is clamped into the upper grip and allowed to hang freely the lower grip is then used to grip the free end of the specimen tightly enough to hold the sample but not with sufficient pressure to damage the sample the sample is stretched until it breaks and the perforation tensile is recorded the wet tensile of the tissue of the present invention is measured generally following tappi method t 576 pm 7 using a three inch 76 2 mm wide strip of tissue that is folded into a loop clamped in a special fixture termed a finch cup then immersed in water a suitable finch cup 3 in with base to fit a 3 in grip is available from 3105 b ne 65 th street vancouver wash 98663 360 696 1611 360 696 9887 fax for fresh basesheet and finished product aged 30 days or less for towel product aged 24 hours or less for tissue product containing wet strength additive the test specimens are placed in a forced air oven heated to 105 u00b0 c 221 u00b0 f for five minutes no oven aging is needed for other samples the finch cup is mounted onto a tensile tester equipped with a 2 0 pound load cell with the flange of the finch cup clamped by the tester 39 s lower jaw and the ends of tissue loop clamped into the upper jaw of the tensile tester the sample is immersed in.