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The mass concentrations of Th-232 and U-238 in several strong, unfilled, highperformance polymers are reported as measures of their radiopurity. Highlyradiopure polymers are required as dielectric materials in the construction ofrare event physics detectors, in order to minimize background signals arisingfrom the detector materials themselves. New data are reported for carefullysourced samples of polyetheretherketone (PEEK), polyetherketoneketone (PEKK), apolyamide imide (PAI, branded as Torlon) and polybenzimidazole (PBI). Data forsolid polyetherimide (PEI) are also discussed and new data for PEI in the formof a commercial 3D printing filament stock are reported. Strong highperformance polymers PEKK, PBI, PAI and PEI were found with levels for Th-232and U-238 that are below one milliBq/kg, including the PEI 3D printingfilament. Specifically, for Th-232 and U-238 respectively, in microBq/kg, wefound values of 149 and 184 for Arkema Kepstan PEKK 6002 flake; 69 and 2250 forSolvay Ketaspire PEEK flake; 346 and 291 for PBI Performance Products lowmetals grade 100 mesh PBI powder; 66 and 105 for Drake Plastics PAI TorlonT-4200 pellets; 401 and 285 for Drake Plastics cured PAI rod; 32 and 41 forEnsinger PEI Ultem 1000 solid; and 15 and 85 microBq/kg, for ThermaX PEI Ultem1010 filament material. These results were all obtained using a novel dryashing method in crucibles constructed of ultra low background (ULB)electroformed copper. Samples were spiked with T-229h and U-233 as internalstandards prior to ashing and determinations were made by inductively coupledplasma mass spectrometry (ICP-MS). Radiopurity is displayed graphicallyrelative to numerical measures of mechanical strength for these and severalother polymers.

Mass spectrometric analyses of high performance polymers to assess radiopurity as ultra low background materials for rare event physics detectors