Awlgrip manufactures two
different types of urethane topcoats; Awlgrip, based on a polyester
urethane resin, and Awlcraft 2000, based on a acrylic urethane
resin. So, what is the difference between the two resins?
Well, put simply, the
difference between the two is molecular size. Polyester
molecules are much smaller than acrylic molecules. So, for a given
volume of polyester resin, there are many more molecules than the
same volume of acrylic resin. Thus the polyester has more reaction
sites than the acrylic. When both are fully crosslinked the
polyester forms a tighter, tougher film. The more dense crosslinking
provides a harder, more abrasion resistant film, with better
chemical resistance than the acrylic film. High crosslink density
also yields a rigid film.
While not cross-linking
as densely as polyesters, acrylics do have key advantages of their
own. They are easy to apply and are fast drying, therefore reducing
dust entrapment in the film. In today's marketplace there is
a need for both acrylic and polyester urethane technology. Both
resins will resist staining and provide long lasting gloss.
Application characteristics, chemical and stain resistance,
repairability and cure times, all need to be considered when
choosing a urethane.
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