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To evaluate selected alternatives using ultrasonic cleaning.
The selected products were diluted to 5% using DI water in 250 ml beakers and heated to 130 F on a hot plate.
The contaminant again consisted of two components from RPM Wood Finishes Group. The first, MS2664 Catalyst White (108-10-1, 28182-81-2, 822-06-0) was used at three parts. The second, MS2669 Primer (108-10-1, 28182-81-2, 822-06-0) was used at one part. The mixed paint/primer was applied to eighteen preweighed steel coupons and allowed to dry. A second weight was recorded to determine the amount of paint applied.
Three painted coupons were immersed in a cleaning product and cleaned for 10 minutes using a 40 kHz ultrasonic tank. After the cleaning, coupons were rinsed in a tap water bath for 15 seconds at 120 F and air dried for 30 seconds at room temperature. The coupons were then rubbed with a gloved hand to determine how easily the paint could be removed. Once dry, the coupons were weighed a final time and removal efficiencies were calculated.
Three of the alternatives resulted in efficiencies over 90% when ultrasonics and wiping were used. Two other products removed over 80% of the paint. One product removed less than 60%. The table below lists the amount of paint applied, the amount remaining and the efficiency for each coupon cleaned.
|Cleaner||Initial wt||Final wt||% Removed|
|Aquavantage 3800 GD||0.0339||0.0031||90.86|
|Inproclean 4000 T||0.0436||0.0048||88.99|
|A 2000 XS||0.0607||0.0004||99.34|
|Surface Cleanse 930||0.0473||0.0038||91.97|
Success Rating:A follow up test, usually based on company input.
The six successful (above 80%) products will be used in the next trial using ultrasonics to remove the top coat paint formulation.