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Spacecraft, nuclear power plant equipment, and other engineering systems usually include components made from radiation-sensitive materials. One common class of such materials is synthetic organic insulation and dielectrics. Equipment designers and qualification engineers need reliable data describing the effects of ionizing radiation on materials of this class. Existing radiation response data for 130 materials of this class have been tabulated as part of a more comprehensive effort. This paper presents graphical presentations of thresholds and 25 percent change dose levels taken from the final report  for that project, along with a brief review of the field, including background and cautions to be observed in applying the data to current problems.