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Trial Number 3

Trial Purpose:

To determine the minimum cleaning time at increased concentrations.

Date Run:

09/11/1998

Experiment Procedure:

Eighteen preweighed coupons were contaminated with oil using a hand held swab and then weighed. Two cleaning solutions were made into 15% solutions using DI water in a 600 mL beaker. The solutions were heated to 130 F on a hot plate. The beakers were then placed into a Crest 40 kHz ultrasonic tank model 4Ht 1014-6 also at 130 F. Three coupons were placed in each cleaner for a set cleaning time. These cleaning times were 15, 30 and 60 seconds. Coupons were rinsed in tap water at 120 F for 30 seconds and air dried. Final weights were taken after drying was complete.

SUBSTRATE MATERIAL: Copper/Nickel 70/30
CONTAMINANTS: Oil-Castrol 10W-40

Trial Results:

Both chemistries had good results for the all cleaning times. Table 1 list the cleaning efficiencies for both cleaners at the 3 cleaning times.
Table 1. Cleaning Efficiencies at Various Intervals

  AK-6215 Daraclean 282
Time 15 30 60 15 30 60
Coupon 1 87.36 89.57 93.35 92.36 95.22 90.64
Coupon 2 90.27 97.45 79.11 96.52 97.43 96.15
Coupon 3 94.48 97.11 100.80 98.12 96.53 94.33
Ave 90.70 94.71 91.09 95.67 96.39 93.71
Std Dev 3.58 4.45 11 2.97 1.11 2.81

Success Rating:

A follow up test, usually based on company input.

Conclusion:

The increased concentration has allowed the cleaning times to be decreased to under 1 minute.  The next testing will be performed using the second oil supplied by the client.

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