u-cat 5050 is a phosphorus-based accelerator with excellent transparency. it is halogen-free and has mild reactivity compared to u-cat 5003. u-cat 5050 is an epoxy curing accelerator for anhydride curing systems and is suitable for transparent applications such as led packages. physicochemical properties of u-cat 5050 · cas no. : 135083-57-8 · molecular formula: c11h21no3p · molecular weight:...