Franklin's Green Foam Insulation

817-831-1240 | | 201 NW 26th Street, Fort Worth, Texas 76164

Polyurethane is a plastic. Polyurethanes are produced by reacting diisocyanates with polyols and other chemicals.  MDI (methylene diphenyl diisocyanate) is one type of diisocyanate used in the manufacture of polyurethanes.
Diisocyanate + Polyol = Polyurethane

MDI or polymeric MDI (PMDI) is one component used in the application of spray polyurethane foam (SPF). When using a polyurethane “system,” the MDI/PMDI is usually the “A-side” or the “iso-side” of the system. The polyol (also called resin) is usually the B-side of the polyurethane system.


 Under controlled conditions, such as in a spray enclosure with proper ventilation and environmental controls, the two components of a polyurethane or polyurea system are drawn from their individual storage drums or tanks into spray processing equipment. The two individual components of the system (the diisocyanate and the polyol) are metered by the processing equipment and fed to a hand-held spray gun. The reactive components meet, mix and are applied by the trained and properly protected applicator.

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