1890 42040 910 10 84 8 1200 88 5 1255 95 6 1360 84 8 1200 155 2200 51041 910 20 86 6 1230 91 6 1300 97 0 1380 87 4 1240 159 2260 540__________________________________________________________________________ the formulations studied were based upon shell cariflex 1101 thermoplastic elastomer a three block copolymer having poly styrene end blocks and a poly butadiene central block in one series this elastomer was compounded directly with a high viscosity aromatic oil shell duplex 929 and kestrel 600 in a second series the elastomer was precompounded with varying amounts of homo poly styrene crystal poly styrene m w 150 000 from shell in all mixes the kestrel 600 was used untreated a brabender internal mixer was used at 160 u00b0 c for the compounding operations the materials were compression moulded into sheets from which standard test pieces were cut about 24 hours aging table 13 below gives details of the formulations tested table 13______________________________________sbs kestrel 600 formulations tested______________________________________series 1code no parts sbs parts kestrel 600 parts oil______________________________________50 10 100 50 1050 20 100 50 20100 20 100 100 20100 30 100 100 30150 30 100 150 30200 50 100 200 50200 80 100 200 80250 80 100 250 80250 100 100 250 100______________________________________ partsseries 2 poly code no parts sbs parts kestrel 600 parts oil styrene______________________________________100 50 30 100 100 30 50100 50 50 100 150 50 50______________________________________ stress strain data were obtained on a j j tensometer at a cross head speed of 500 mm min strain rate 1000 min other physical tests were performed according to british standards specifications except where otherwise stated a summary of principal results is given in table 14 below table.