Trial #1
To further test the cleaners from the previous trial.
Twelve preweighed coupons were contaminated with the sealant using a hand-held swab. Coupons were reweighed after sealant had dried.
Four cleaning chemistries were selected from the previous test based on cleaning efficiencies. Glass petri dishes, 4" diameter, were filled 1/3 full with each cleaner at 100% concentration. The dishes were heated to 130 F on a hot plate. One coupon was placed in the dish at a time and soaked at room temperature for 3 minutes. At the end of the soaking, the coupon was removed and wiped for 1 minute with a paper towel. Coupons were air dried and weighed to obtain their clean weights. Cleaning efficiencies were then calculated.
SUBSTRATE MATERIAL: Aluminum (Al 202-50552 H-32)
CONTAMINANTS: Acrylic Sealant-Aromatic Hydrocarbon (Toluene CAS# 108-88-3)
A couple of the cleaners benefited from the increased temperatures. Others showed little or no improvement. Table 1 list the cleaning efficiencies of the four chemistries tested.
Table 1. Cleaning Efficiencies at 130 deg F
|
|
HTF 85 B
|
Citrisolv
|
Luminox
|
Soy Gold
|
| Coupon 1
|
97.9
|
19.07
|
63
|
49.04
|
| Coupon 2
|
99.6
|
56.1
|
36.39
|
75.16
|
| Coupon 3
|
83.67
|
74.02
|
49.67
|
44.42
|
| Average
|
93.72
|
49.73
|
49.69
|
56.21
|
The second table takes the average cleaner efficiency from both trials and compares them to each other.
Table 2. Comparison of Cleaning Efficiencies
|
|
HTF 85 B
|
Citrisolv
|
Luminox
|
Soy Gold
|
| Trial 1
|
42.2
|
43.82
|
6.941
|
30.68
|
| Trial 2
|
93.72
|
49.73
|
49.69
|
56.21
|
Both HTF 85 B and Luminox increased with the addition heat whereas Citrisolv and Soy Gold had marginal increases.
The T-Square sample had over 90% removal of the contaminant when heated to 130 F. The next phase of testing will involve the customer supplied painted parts. Compatibility of HTF 85 B with the paint will be examined. The MSDS of HTF 85 B has been included with this report.
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