SHAMROCK TECHNOLOGIES › HYDROCER™ 303 HYDROCER™ 303 $0.00 SHAMROCK HYDROCER™ 303 is a 35% aqueous dispersion of a special blend of polyethylene waxes. Add To Cart Added! SHAMROCK HYDROCER™ 303 is a 35% aqueous dispersion of a special blend of polyethylene waxes. You Might Also Like HYDROCER™ EP91 HYDROCER™ 257 HYDROCER™ ER 77 HYDROCER™ 7112 HYDROCER™ AE 35 FG