What is the difference between “Dicy” and “nonDicy” as a hardening system in the FR4 epoxy?

FAQ about printed circuit boardsMATERIAL

Dicy (Dicyandiamine) is by far the most common hardening system for this epoxy; it normally gives a Td value of about 300–310°C while a “nonDicy”, i.e. a Phenolic Cured Epoxy has a Td value of about 330–350°C and can therefore better resist the higher temperature.