Trial #0
1st contaminant cleaning
Eighteen preweighed coupons were coated with Bencyn B-5186 (64742-52-5, 9003-29-6, 39464-69-2, 63197-48-8) a heavy metal working fluid using a hand held swab. Coupons were reweighed. Nine coupons were clipped to wire racks and immersed into the Flow-Matic machine and cleaned for 1 minutes using ultrasonics at 92 F, removed and rinsed in a tap water spray and re-immersed into the ultrasonics for an additional 1 minute followed by a second 5 second rinse. The nine coupons were then dried using an air knife for 15 seconds and then using a Master Appliance heat gun at 500 F for 15 seconds. The second set of nine coupons followed the same cleaning cycle except they were hung on a wire stand and immersed into a Crest 40 kHz ultrasonic tank.
Comparison of the two processes revealed that the Flow-Matic system was more effective than the traditional ultrasonic equipment. The following table lists the results obtained during the evaluation.
Table 1. Cleaning Efficiencies
| Process
|
Flow-Matic
|
Traditional
|
|
|
96.6
|
56.9
|
|
|
95.0
|
70.0
|
|
|
70.1
|
57.4
|
|
|
93.1
|
51.7
|
|
|
76.9
|
77.8
|
|
|
68.0
|
74.1
|
|
|
95.8
|
67.6
|
|
|
95.2
|
77.8
|
|
|
80.2
|
67.5
|
| Average
|
85.7
|
66.8
|
For the heavy metal working fluid, the Flow-Matic system was more effective than the traditional ultrasonic method.
No relation