BYK S 740 is a highly effective additive that reduces monostyrene emission in orthophthalic resins. Using BYK S 740 does not adversely affect interlaminar adhesion. BYK S 740 is particularly suitable for orthophthalic resins and can also be used in isophthalic resins. It provides up to 90% reduction in monostyrene emission which helps meet stringent emission norms. BYK S 740 incorporation does not impact the mechanical properties and adhesion qualities of the final product. Its use provides environmental compliance without compromising on performance.