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The other major contributor to the physical properties of urethanes is the curative used. Millable gum urethanes may employ standard peroxide and sulphur cure systems similar to other elastomers, but thermoplastic and higher performance thermosetting materials employ isocyanate cure systems. These may be of several basic types: |

MDI - Methylene bis-(4-phenylisoyanate) is commonly known as MDI and is the second most common curative. Most often used in thermoplastic materials.

TDI - 2,4-tolyene diisocyanate is known as TDI. Used in specialty millable gums and some casting systems as well as in most foam urethane materials; the most commonly used urethane curative in the world.

TODI - 3,3'-Dimethyldiphenyl-4,4' diisocyanate is known as TODI. Imparts excellent heat resistance properties along with superior mechanical properties.

PPDI - p-Phenylene diisocyanate is known as PPDI. With the best heat resistance of any polyurethane currently on the market, PPDI has found a home in applications requiring hysteresis resistance and high temperature environments.