Profile: Niagara Plastic Co. is involved in supplying of protective closures to a variety of industries. We are an ISO/TS 16949, ISO-9001 and ISO 14000 certified company. Our closures are designed to cover, plug, wrap and protect product during manufacturing, shipping & handling. Our products include tapered caps and plugs, core plugs, non threaded caps & vinyl grips as well as nylon fasteners.