QUENCHANT FUNDAMENTALS: QUENCH OIL BATH MAINTENANCE By D.A. Wachter 1 , G.E. Totten 2 and G.M. Webster 3 ABSTRACT It is essential that periodic analysis of quench oils be conducted to assure optimal performance. A quench oil testing strategy is discussed which includes various recommended and optional procedures. Following these recommendations will provide the heat treater with more uniform hardening, reduced distortion and cracking and significant improvements in operational safety. 1. D.A. Wachter is president of Engineered Lubricants Inc., 11525 Rock Island Court. Maryland Heights, MO 63403-3597; Tel: 314-872- 9540, FAX: 314-872-9544. 2. G.E. Totten is a senior research scientist for Union Carbide Corporation, 777 Old Saw Mill River Road, Tarrytown, NY 10591; Tel: 914-345-5327, FAX: 914-345-5311, E-Mail: GETotten@aol.com. 3. G.M. Webster is an engineer for Union Carbide Corporation, 777 Old Saw Mill River Road, Tarrytown, NY 10591; Tel: 914-345-5336, FAX: 914-345-5314, E-Mail: GMWebster@aol.com.