Eight cleaners were selected from the laboratories database of past testing based on supplied data from client. One aqueous based cleaner was diluted to 10% using DI water in a 250 ml beaker. The semi-aqueous products were used at full strength also in 250 ml beakers. The eight products were heated to 110 F on a hot plate. Twenty-four preweighed ceramic coupons were coated with client supplied lacquer, Microshield Stop Off (78-93-3, 108-88-3, 109-99-9, 75-56-9, 842-07-9). The contaminant was applied directly to the coupon surface using a swab. The coupons were allowed to dry at room temperature before weighing a second time. Three coupons were cleaned in each solution for 10 minutes using stir-bar agitation. Coupons were rinsed in tap water for 15 seconds at 120 F, followed by air blow off at room temperature. Once dry, coupons were weighed a final time and efficiencies for each cleaner were calculated.
Trial Results:
Two of the eight products, Metabolix E3HB and DuPont DBE-6, tested showed visual signs of dissolving the Stop Off within the 10 minutes. Gravimetric analysis revealed that E3HB cleaned coupons actually gained weight. The DBE-6 removed around half of the contaminant. The other products removed less than 10%. The table lists the amount of Stop Off that was added, how much remained after cleaning and the efficiency for each coupon.
Cleaner
Initial wt
Final wt
% Removed
Uni Clear
0.0459
0.0435
5.23
0.0490
0.0483
1.43
0.1078
0.0932
13.54
Bio T 300B
0.0690
0.0647
6.23
0.0570
0.0536
5.96
0.1006
0.0917
8.85
D Limonene
0.0807
0.0778
3.59
0.0815
0.0778
4.54
0.1294
0.1169
9.66
Citrus Pure
0.0709
0.0650
8.32
0.0509
0.0480
5.70
0.1035
0.0955
7.73
E3HB
0.0983
0.1046
-6.41
0.1111
0.1191
-7.20
0.1140
0.1189
-4.30
DBE 6
0.0702
0.0398
43.30
0.1167
0.0667
42.84
0.1181
0.0692
41.41
SC Supersolve
0.0724
0.0719
0.69
0.1193
0.1078
9.64
0.0710
0.0705
0.70
Micro 90
0.0844
0.0803
4.86
0.1632
0.1525
6.56
0.1110
0.1039
6.40
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Based on the visual evidence, both the Metabolix and DuPont products will be tested at an extended cleaning time. Additional products may also be tested.
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