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Trial Number 2

Trial Purpose:

To further evaluate cleaners using ultrasonic energy in conjunction with effective cleaners.

Date Run:

11/03/1999

Experiment Procedure:

Four products were selected based on the previous testing performed for the client. All four cleaners were diluted to 5% using DI water in 400 ml glass beakers. Two were also made into a 10 and 100% solution. All products were heated to 130 F on a hot plate. Table 1 lists the products evaluated and the corresponding concentrations.
Eighteen preweighed coupons were coated with the flux and heated to 100 F for one hour in an oven. After cooling to room temperature, a second weighing was performed to determine the amount of contamination present on each coupon. The cleaning solution was placed in a Crest 40 kHz ultrasonic tank model 4Ht 1014-6 filled with water heated to 130 F and degassed for five minutes. Three coupons were placed into the suspended beaker and cleaned for five minutes. Coupons were rinsed in DI water at 130 F for 30 seconds and dried using a Master Appliance Corp, Hot-air gun model HG-301A at 500 F for 30 seconds. Once the coupons returned to room temperature, final clean weights were recorded and cleaning efficiencies were calculated.

SUBSTRATE MATERIAL: Brass Coupons 260
CONTAMINANTS: Kester Solder 1544 Rosin Flux-(Ethanol CAS#64-17-5;2-Butanol CAS#78-92-2*;Modified Rosin CAS#8050-09-7)
CONTAMINATING PROCESS USED: Coupons coated using hand-held swab and then dried in an oven at 100 F for one hour.

Trial Results:

The use of ultrasonic energy greatly increased the efficiencies of all the solutions tested. Only one solution, Bio-T at 5% dilution had an efficiency lower than 95%. Table 2 lists the results for each cleaner and concentration.

Table 2. Cleaning Effectiveness

  Armakleen Safey Wash 5 SW 10 Bio-T 5 Bio-T 100 Inproclean
Coupon 1 100.06 97.58 99.85 71.97 100.09 100.27
Coupon 2 100.00 91.38 100.00 44.69 100.00 95.61
Coupon 3 99.76 96.47 99.61 18.37 100.22 99.78
Average 99.94 95.14 99.82 45.01 100.10 98.55

Success Rating:

Results suggest a scale-up feasible match for cleaning chemistry and equipment. Pilot plant study with actual parts recommended.

Conclusion:

All of the products tested were very effective in removing nearly all of the flux from the coupons.  The increased concentrations for Safety Wash CRC and Bio-T 300 B proved to be as effective as the Armakleen and Inproclean 4000 T at 5%.  These four solutions will be used to clean the supplied client parts.

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