Basically, a TPU Reactive Hot-Melt (RHM) is the result of a chemical reaction between a polyol and an isocyanate, under defined conditions (sometimes with a catalyst), which produces a prepolymer with reactive NCO- terminal groups which will react with moisture when applied and form a high molecular-weight, crosslinked polymer.

Unlike the usual hot-melts (EVA, SBR), in which the structure of the polymer must exist from the start, so as to assure a high adhesive and cohesive strength, in the reactive hot-melts, the final structure will be achieved merely as a result of the action of moisture.

PEARLBOND can be added to the formulation of Reactive Hot-Melts (RHM) in amounts of 5 to 10 %, enabling the improvement of some properties, namely:

     · Green strength (increase crystallization rate).
     · Regulation of setting time.
     · Regulation of open time.
     · Increase cohesive strength.
     · Increase specific adhesion to some substrates (polar groups)

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