1,Polyurethane foam head over rigid paddle 2,Closed ... 4.Thermally sealed head Description Cleanmo Anti-static Cleanroom Polyurethane Foam Swab is constructed from compressed 100 ppi (Z ... ) open-cell polyurethane foam that is free from organic contaminants such as ... silicone, amides and DOP. The foam is thermally bonded to the handle, thus, eliminating ...