Alternate instrumental methods of measuring scorch and cure characteristics

After the development of the oscillating disk curemeter over 30 years ago, standard conditions for measuring scorch times (time tille the onset of vulcanization) were developed. ISO 3417 and ASTM D2084 describe t s 1 and t s 2 test parameters which are accepted by the rubber industry as a method for measuring scorch times. t s 1 is the time until one torque unit rise above minimum torque and t s 2 is the time until two torque units rise above minimum torque. These parameters are arbitrary and do not measure the true scorch time. Also t s 1 and t s 2 may not be an accurate comparison for compounds which differ greatly in their state of cure