HyPox RF928 Epoxy phenol novolac resin modified with CTBN co-polymer CVC Epoxy Resins >> Phenol & Cresol (Novolacs) HyPox RF928 is an Epoxy Phenol Novolac resin modified with a CTBN(carboxy terminated butadiene acrylonitrile) co-polymer. HyPox RF928 possesses a relatively low viscosity, a functionality of 2.3 and an elastomer content of 20%. The CTBN improves the toughness of cured epoxy formulations through development of two phases during cure. The toughness improvement is achieved at a minimal sacrifice in Tg. Formulations incorporating HyPox RF928 exhibit improvements in impact and thermal cycling resistance, peel and tensile shear strengths and low temperature mechanical properties compared to nontoughened epoxies. HyPox RF928, due to its higher functionality, should provide improved chemical and heat resistance compared to DGEBA modified at an equal rubber level. HyPox RF928 should be considered for use as the sole resin or as a part of the resin component of your formulation. The optimum concentration of HyPox RF928 should be determined empirically. Typical applications generally incorporate 5-15 phr* rubber to achieve optimal toughness, higher concentrations increase flexibility. *phr – parts per hundred parts resin. It is used in adhesives, laminating, impact resistance coatings, reinforcements, filament winding, molding compounds. Epoxy Phenol Novolac resin modified with a CTBN(carboxy terminated butadiene acrylonitrile) co-polymer. Exhibits improvements in impact and thermal cycling resistance, peel and tensile shear strengths and low temperature mechanical properties compared to nontoughened epoxies. Used in laminating, impact resistance coatings, reinforcements, filament winding, molding compounds.