Papi 27 Isocyanate Dow Chemical PU - Isocyanates >> MDI, diphenylmethane diisocyanate >> Polymeric MDI PAPI* 27 polymeric MDI is a polymethylene polyphenylisocyanate that contains MDI. This product has a narrow molecular weight distribution and a high reactivity. Applicable to many foam processes, this product is compatible with rigid polyether and polyester polyols, making it suitable for a full range of low- to high-density semi-rigid foams, rigid foams and structural RIM processing. Polymethylene polyphenylisocyanate that contains MDI. Possesses a narrow molecular weight distribution and a high reactivity. Compatible with rigid polyether and polyester polyols. Suits for a full range of low- to high-density semi-rigid foams, rigid foams and structural RIM processing.