Eight cleaners were selected from the lab's database of effective testing and from clients previous testing based on supplied input. All eight were diluted to 5% in 600 ml beakers using DI water. Each solution was heated to 130 F on a hot plate and then degassed for 5 minutes in a Crest 40 kHz ultrasonic tank.
Twenty-four preweighed coupons were coated with Fuchs Lubricants Co Renodraw 12 using a hand held swab. Coupons were then reweighed using a Denver Instruments A250 balance to determine the amount of contaminant added.
Three coupons were immersed into each solution and cleaned for 2 seconds using ultrasonic energy. Coupons were rinsed for 2 more seconds in a tap water ultrasonic bath at 120 F and finally dried using air knives at room temperature for 10 seconds. After coupons were dried, final weights were recorded and efficiencies calculated for each cleaning solution. The cleaning procedure was repeated for two additional cleaning times, 4 and 8 seconds.