Materials used for the plastic are often polyurethanes or epoxy resins. Silicone rubbers and thermoplastic polyurethanes are also in use. Thermoset polyurethanes are also used as a protective coating against abrasion. Thermosets are subdivided into several resin systems including epoxies, phenolics, polyurethanes, and polyimides. These include epoxies, polyurethanes, and cyanoacrylates. These were spherically moulded from ethylene-vinyl acetate (EVA) and thermoplastic polyurethanes (TPU). These then were spherically moulded from ethylene-vinyl acetate (EVA) and thermoplastic polyurethanes (TPU). Desmopan or Elastollan are examples of thermoplastic polyurethanes (TPU). Diisocyanates are manufactured for the production of polyurethanes, a class of polymers. In addition, interactions between polyurethanes and wood polymers can significantly influence bond performance. Therefore, one component polyurethane adhesives are also named as moisture-cure polyurethanes. Classic two-package epoxies or polyurethanes would fall into this category. Polyurethanes and PVC are good examples of waterproof plastics. Polyurethanes and poly(ester amide)s are used in biomaterials. Recently, there have been a large emphasis on producing biobased and isocyanate-free polyurethanes.