Hi-Mar DFI-51 Oil-free Thornley Company Defoamers / Anti-Foaming Agents Polyvinyl Alcohol (PVOH) ADHESIVE A 100% active process oil-free defoamer. It is very effective in high solids, latex binders and polyvinyl alcohol systems. 100% active process oil-free defoamer, effective in high solids, latex binders and polyvinyl alcohol systems.