[en] Kapton (polypyromellitimide) is used in space applications as an insulator, thermal blanket layer, substrate for solar cell arrays, and surface coatings. This report describes laboratory tests of kapton materials to investigate the erosion damage caused by simulated space radiation on those polymers. The tests were carried out at the McMaster University Tandem Accelerator Laboratory using protons and alpha particles at various energies, approach angles, and fluences. Samples tested were 7-millimeter squares 0.1 millimeter thick. Damage to specimens was measured by a weight loss technique. Results are presented and compared to those obtained using Monte Carlo simulation