Adiprene® Blocked Urethane Prepolymers are based on a technology to control the cure of urethane elastomers. This technology effectively blocks the curing reaction until it is heat activated at the optimum time in the process. This enables the pouring of large and complex parts, and even facilitates the use of hand batching. Blocked systems can be processed with curatives that would otherwise be too fast for traditional unblocked prepolymers, but that provide toughness and other properties not achievable with standard curatives. By starting with LF MDI technology, blocked LF MDI prepolymers have lower viscosity and low melting point to further improve processing.