Agitan 731 Polysiloxane Ultra additives Defoamers / Anti-Foaming Agents ADHESIVE >> Hot-melt >> Pressure sensitive (HMPSA) Agitan 731 Defoamer Polysiloxane Non-emulsifiable Used in pressure sensitive, laminating and packaging adhesives. Non-emulsifiable polysiloxane. Used as a defoamer in pressure sensitive, laminating and packaging adhesives.