fed into a 170 ton toshiba reciprocating screw injection molding machine a moisture level less than about 0 01 was commonly measured the machine was capable of operating at three different internal temperature regions plus a separate nozzle temperature typical molding conditions for the glass glass ceramicpolymers of the following examples utilized temperatures between about 655 u00b0 700 u00b0 f in the rear zone about 670 u00b0 750 u00b0 f in the center zone about 685 u00b0 775 u00b0 f in the front zone and a nozzle temperature between about 700 u00b0 810 u00b0 f die temperatures generally ranged about 350 u00b0 550 u00b0 f injection pressures and screw speeds varied with the chemistries of the glass polymer the proportions of each component and the temperatures and times employed in molding table ii records several representative mechanical properties measured on alloys prepared from the glass compositions recited in table i and processed into bodies of the desired configuration required for a particular test in table ii the abbreviations present therein have the following meanings hdt refers to heat deflection temperature which was measured in accordance with a modification of astm d648employing a load of 264 psi mor refers to modulus of rupture which was measured in accordance with a modification of astm d790 and is reported in terms of psi u00d7 10 3 imp str refers to impact strength which was measured in accordance with a modification of astm d256.