Isonate M 309 Isocyanate Dow Chemical PU - Isocyanates >> MDI, diphenylmethane diisocyanate >> Modified MDI ADHESIVE SEALANT Modified MDI ISONATE* M 309 is a liquid MDI derivative. ISONATE M 309 has been designed for use in the manufacture of polyurethane flexible and semi-rigid foams. It can also be used in the formulation of both one and two component coatings, adhesives, sealants, primers, binders and encapsulating material. Typical applications include all-weather, lowmaintenance sports tracks and scrap foam rebonding agents. Liquid MDI derivative. Used in the formulation of both one and two component adhesives and sealants.