The six products that were found to be effective on all three soils were used at 120 F in a Crest Ultrasonic 40 KHz tank. Five products were used at 5% dilutions in 600 ml beakers and the sixth was used as received from the client in a 400 ml beaker. Each beaker was submersed in the tank filled with water at 120 F and degassed for 5 minutes.
Four to five parts were cleaned in each product for five minutes with ultrasonic energy. The parts were rinsed in tap water at 120 F for 30 seconds and dried using air blow off at room temperature for 30 seconds. Parts were visually inspected and then packaged. Parts were sent back to client to determine effectiveness.
Possible soils: Castrol Industries Rustilo 4163 (64742-46-7, 8002-74-2, 34590-94-8); Castrol Industries Rustilo DW 924 (64742-88-7, 64742-95-6, 64741-89-5, 64741-97-5, 64742-53-6, 95-63-6)