NYACOL® AP50 flame retardant additive is a dispersion of nano-sized (colloidal) antimony pentoxide particles in a liquid, high molecular weight, tertiary amine. The oxide particles are nearly 1/50 the size of powdered antimony trioxide.

NYACOL® AP50 is recommended for liquid flame retarded epoxy systems, in aerospace structural prepregs, and in printed circuit boards. Use of antimony oxide in such systems permits reduced bromine levels in the epoxy resins. The colloidal particles will not settle or segregate in the liquid resin system. The nano-sized particles will pass between the fibers of re-enforcement insuring uniformity of the composite structure. Also, unlike antimony trioxide, it is non-tinting, retaining the translucency of the resin or allowing mass tone colors.

The tertiary amine component of NYACOL® AP50 does not catalyze the epoxy reaction in typical structural prepreg formulations but laboratory evaluation is recommended.