Four products were selected from the lab's on-line database, www.cleanersolutions.org, based on past testing results matching client supplied information. All products were used at full strength in 600 ml beakers. Each solution used at room temperature in a Crest 40 kHz ultrasonic tanked filled with water and degassed for 5 minutes prior to cleaning.
Sixteen pre-weighted coupons were coated with supplied photo resist from company using a hand held swap. Each coupon was coated 3 times manually.
Coupons were allowed to sit overnight and reweighed to determine the amount of resin applied. Three coupons were immersed into each solution at room temperature for 5 minutes using ultrasonic energy. Following cleaning, coupons were rinsed in a tap water bath for 15 seconds then dried using compressed air at room temperature for 60 seconds. Final clean weights were recorded and cleaning efficiencies were calculated for each product.
Trial Results:
Two cleaners resulted in more than 90% removal of the contaminant. The table below shows the amounts of soil added and removed by each cleaning solution.
Gravimetric Table
Cleaner
Initial wt
Final wt
% Removed
Bio T Max
0.1532
0.1272
16.97
0.1663
0.1428
14.13
0.1682
0.1027
38.94
Solsafe 245
0.2324
0.0491
78.87
0.1931
0.0411
78.72
0.1586
0.0336
78.81
Ez Solv
0.2522
0.0186
92.62
0.2052
0.0147
92.84
0.1675
0.0098
94.15
Biosolv
0.1384
0.0008
99.42
0.1935
0.0203
89.51
0.2229
0.0084
96.23
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Ez Solv and Bio Solv products were successful in removing the photo resist in five minutes of ultrasonic cleaning.
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