u00b0 to 340 u00b0 f the milled stock was pressed 3 min at 340 u00b0 360 u00b0 f and 32 000 psi to 40 and 70 mil sheets and aged for 48 hours at room temperature for evaluation all tests were made with samples cut from 70 mil pressed stock except for extraction tests which were obtained on 40 mil samples the performance data was obtained by accepted astm methods with modifications as detailed below in table b ______________________________________tensile strength determined with instron tt 1100ultimate elongation series 2 in min using amodulus 100 dumbbell shaped specimen testelongation carried out at 70 u00b0 u00b1 5 u00b0 f astm d638 hardness determined with shore durometer a astm d676 10 sec at 75 u00b0 u00b1 5 u00b0 f torsional flex t sub 4 and determined with torsion flext sub f tester of clash and berg design astm d1043 t sub 4 is the temperature at which the modulus of rigidity is 10 000 psi t sub f is the temperature at which the modulus of rigidity is 100 000 psi brittle point determined by impact method using astm d746 scott tester model e volatile loss a c determined on specimens 2 inches in astm d1203 diameter heated in activated carbon at 70 u00b0 c for 24 hours results are expressed as percent of plasticizer lost water extraction tap determined on specimens 2 inches insoapy water extraction diameter suspended in appropriate 1 ivory flakes liquid at 60 u00b0 c 24 hours oil extraction results are expressed as percent astm no 3 of plasticizer lost.