Quality assurance of PMR-15

Controls on the PMR-15 resin and/or prepreg were established to ensure a solid base for the subsequent process development task. The effort was divided into subtasks which included evaluation of commercially available graphite/PMR-15 polyimide prepregs, detailed evaluation of materials and selection of chemical test procedures. During the initial phase of the program a variability problem was detected in the PMR-15 resin. The manufacturing and/or storage of the PMR-15 resin/esters was identified as the chief cause for the variability.