Superior Materials, Inc., Garden City, NY, announced that Bruce Schimmel has joined the company as sales manager. As part of the management team, Mr. Schimmel brings to Superior his expertise in the handling of national accounts as well as management over expanded territories.      Most recently business development manager with Hydrite Chemical, Mr. Schimmel has had upper management positions with Alcan, Ultra Additives-Munzing and Eckart America. He is well versed in the sale of pigments, ad...