Moisture-curable TPO Compound PEXIDAN® A-3021 is an ethylene-copolymer based XLPE curable by moisture and is intended for application requiring superior flexibility. When mixed in the proper proportions with a suitable catalyst masterbatch, the resulting mixture is curable by exposure to stream, 70-95°C hot water, or even ambient moisture. A-3021 is the silane-grafted base component of a 2-part system and must be used with a suitable catalyst masterbatch.