PURPOSE: To provide the titled compsn. which produces a cured article having excellent heat resistance and flame retardance, consisting of a polyfunctional epoxy compd. and a specified triazine compd.

CONSTITUTION: A triazine compd. (B) of formula I (wherein R' is NH2, Cl; R" is NH2 or a group of formula II; R' contains Cl in an amount sufficient to give a chlorine content of at least 3wt%; at least one of R' and R" is NH2; n is 1, 2) is blended with a polyfunctional epoxy compd. (A) (e.g. diglycidyl ether of bisphenol A) in such a proportion that one active hydrogen of the hydroxyl group and the amino group of the component (B) is reacted with one epoxy group of the component (A).

EFFECT: When this compsn. is heated at 100W200°C for 1W60min, there can be obtd. a cured article which has excellent mechanical strength and dielectric characteristics and which corresponds to at least class H in the heat resistance classification of insulating materials.

USE: Org. insulating materials for electronic parts.