a low dielectric constant material having an excellent water resistance obtained by heat - treating a borazine compound of the formula : or an inorganic or organic compound having a group derived from the borazine compound to undergo a condensation reaction , thereby producing an oligomer or polymer , wherein r 1 to r 6 are independently a hydrogen atom , an alkyl group having 1 to 20 carbon atoms , an aryl group , a substituted aryl group , an alkenyl group , an amino group , an alkylamino group , an alkoxyl group , a thioalkoxyl group , a carbonyl group , a silyl group , an alkylsilyl group , a phosphino group , an alkylphosphino group , or a group of the formula : si , and at least one of r 1 to r 6 is not hydrogen atom .