While polyols are often utilised in the construction of isocyanate pre-polymers
used in polyurea spray systems, these specialty pre-polymers, such as
Huntsman’s line of SUPRASEC® isocyanates, are produced without the
catalysts that are usually required to promote the reaction of isocyanates
and polyols. Polyols are not to be added into the amine resin blend if the
elastomer is considered to be a true polyurea. Polymer systems that do
incorporate polyols into the resin blend are commonly referred to as “hybrid
systems”. The term hybrid refers to the presence of both polyurea and
polyurethane linkages within the system, and it should be noted that on
many occasions these materials do not offer the same performance or
processing profiles as true polyureas.