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With the dual objective of economy in laboratory man-hours, and more comprehensive evaluation of elastomer vulcanization compounding, a technique has been developed which combines the Curometer and the Instron tester. By mounting the vulcanizing chamber assembly of a standard Curometer vertically on the face of a compression load cell of an Instron tester, and the Curometer paddle vertically in the Instron crosshead, measurements of vulcanization activity at temperatures of current commercial interest can be made by the proposed method. This method takes advantage of recognized valuable features of both instruments, including: 1. wide range of chart operating speeds, 2. small specimens, 3. easy and rapid changes in temperature, 4. rapid oscillatory movement, 5. heavy-duty mechanical actuation of the strain applicator (paddle) and reliable electronic programming and instrumentation, and 6. measurement of stress resulting from constant strain applied repeatedly (analogous to conventional physical test procedures). Sample Instron charts are displayed and their interpretation discussed. A statistical evaluation of the technique is included, as well as suggestions for its application.
Rowley, A. C.
R. T. Vanderbilt Co., East Norwalk, Conn.