Trial Purpose:
To evaluate cleaners on second contaminant
Date Run:
02/23/2004Experiment Procedure:
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.
