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Trial Number 3

Trial Purpose:

To evaluate successful cleaners on third contaminant.

Date Run:

06/11/2001

Experiment Procedure:

The four successful cleaners from the previous trial were again diluted to 5% using DI water in 600 ml beakers and
placed in a Crest 40 kHz ultrasonic tank model 4Ht 1014-6. Solutions were heated to 130 F.
Twelve preweighed coupons were coated with Spartan Chemical MOAC 2945 (64742-52-5, 64742-53-5,
63449-39-8, 68608-26-4, 68918-91-2, 8002-26-4, 111-46-6, 107-41-5, 4719-04-4) and reweighed. Three coupons were immersed into each solution and cleaned for five minutes. The coupons were rinsed in tap water at 120 F for 30 seconds and dried using a Master Appliance Corp, Hot-air gun model HG-301A at 500 F for 1 minute. Final "clean" weights were recorded and efficiencies were calculated.

Trial Results:

Again all four cleaners were very successful in removing the contaminant from the steel coupons.  The table lists the calculated results for each solution

Cleaner Coupon 1 Coupon 2 Coupon 3 Average Std Dev
1 99.85 100.02 100.06 99.98 0.11
2 99.56 100.07 100.04 99.89 0.29
3 100.14 100.05 100.07 100.08 0.05
4 100.09 100.08 100.07 100.08 0.01

During the cleaning process, it was observed that all four solutions required 2 minutes or less to remove the coolant.
When the coolant was removed from the coupon, the cleaning solution become cloudy. This may be a problem for
treatment of the solution after prolonged use.

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.

Conclusion:

The four solutions removed all of the contaminant from the coupons within 2 minutes of ultrasonic cleaning.  The contaminant did not separate out from the cleaning solution after the trial was completed.

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