To evaluate the effectiveness of a solvent and aqueous based cleaners on the removal of silicone adhesives from stainless steel coupons using heated ultrasonics to replace NMP.
Date Run:
02/06/2020
Experiment Procedure:
Twelve pre-weighed stainless steel coupons, three for each cleaner, were soiled for each contaminant tested. Approximately 0.5 g of the soil was applied using a hand held swab. Each set of coupons were placed into a beaker and immersed along with 40 kHz ultrasonics for 30 minutes. During this process, any noticeable soil removal was observed at ten minute intervals. Coupons were allowed to dry for 24 hours, and afterwards final weights were recorded as well as efficiency of removal was calculated for each coupon cleaned.
Trial Results:
Cleaner
Conc.
Initial wt. of cont. (g)
Final wt. of cont. (g)
% Cont. Removed
% Average
Aquavantage 1400 GD
10%
0.4511
0.3727
17.38
19.67
0.557
0.4828
13.32
0.3842
0.2754
28.32
Surface Clean 930
2%
0.6263
0.6212
0.81
0.40
0.6134
0.6111
0.37
0.6439
0.6438
0.02
SC Aircraft and Metal Cleaner
1%
0.5851
0.5166
11.71
13.68
0.5326
0.4617
13.31
0.4559
0.3828
16.03
Sta-Sol® ESS 160
100%
0.3836
0.181
52.82
53.37
0.4321
0.1667
61.42
0.4309
0.2332
45.88
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
All of the chemistries evaluated were not efficient in the removal of silicone adhesive in heated ultrasonics. Further testing with Sta-Sol® ESS 160 will be conducted with varying temperatures due to the promising visual and gravimetric results. The three aqueous cleaners have been deemed ineffective and will no longer be considered as an alternative.
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