Fire resistant glass fiber mats

A fire resistant glass fiber product comprised of glass fibers held together with a binder, said binder comprising at least one nitrogen containing compound, wherein when said nitrogen containing compound is a nitrogen containing resin, said resin containing from none to no more than 1.5 weight percent, based on the weight of said resin, of a phosphorous compound as a curing catalyst, said product also containing at least one boron containing compound in contact with said nitrogen containing compound, wherein said boron containing compound is present in amounts that would produce a boron content in the fiber glass product equivalent to what at least 15 wt. percent boric acid in the fiber glass product would produce and wherein said nitrogen containing compound(s) is present in an amount to produce at least about one mol or atom of nitrogen for every mol or atom of boron that is in said boron containing compound, and wherein said glass fibers constitute at least 20 weight percent of said product.