and was stripped of unpolymerized monomers and solvent under reduced pressure and at elevated temperature melt indices of the resulting polymers were determined at 190 u00b0 c asdescribed in tentative astm test method d 1238 52t astm standards 1955 part 6 pages 292 295 copolymers were vulcanized by the following procedure on a 2 roll ruber mill at about 50 u00b0 75 u00b0 c were mixed copolymer carbon black curing agent antioxidants and other additives as indicated the compositions were sheeted off the mill and specimens for physical testing were prepared vulcanizate slabs 0 075 in thick were prepared by press curing for 30 minutes at 180 u00b0 c at about a total gage pressure of 40 000 lbs modulus tensile strength and elongation values were obtained at room temperature by astm method d 412 66 on press cured samples percent volume oil swell after immersion in astm 3 oil for 70 hrs at 150 u00b0 c was determined according to astm d 471 68 on press cured samples oscillating disc rheometer odr measurements were obtained on the uncured stocks by astm method d 2705 the maximum cure rate was obtained by drawing a tangent at the steepest part of the rise ofthe curing curve on a plot of torque versus time and dividing the night of the tangent by the time required to transverse that night this example illustrates that as.