Trial #4
To evaluate cleaners on second contaminant
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.
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
|
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.
No relation