To replace current cleaner, Toluene, with a less flammable cleaning solutions.
Date Run:
09/11/1998
Experiment Procedure:
Eighteen preweighed coupons were contaminated with the sealant using a hand-held swab. Coupons were reweighed after sealant had dried. Six cleaning chemistries were selected from the lab’s database of previous test conditions and from vendor supplied information. Glass petri dishes, 4" diameter, were filled 1/3 full with each cleaner at 100% concentration. 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 rinsed for 10 seconds in tap water at 120 F and air dried. Once dried, coupons were 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) CONTAMINATING PROCESS USED: Sealant was applied to coupons with a hand-held swab and allowed to dry overnight.
Trial Results:
All of the cleaners had some difficulty in removing the sealant from the coupons. Three were able to remove around half of the contaminant and the remaining cleaners were under 10% effective. Table 1 list the cleaning efficiencies.
Table 1. Cleaning Efficiencies
Daraclean
HTF 85 B
Citrisolv
Luminox
Shopmaster
Soy Gold
Coupon 1
0.3748
50.09
55.07
2.96
-2.601
33.25
Coupon 2
0.3204
28.62
24.99
12.35
6.112
16.61
Coupon 3
0
47.9
51.4
5.52
-2.701
42.19
Average
0.2317
42.2
43.82
6.94
0.269
30.68
Success Rating:
Test incomplete or inconclusive.
Conclusion:
Having obtained marginal results, further testing of HTF 85 B, Citrisolv, Soy Gold and Luminox will be conducted. Temperature and time will both be modified to help increase cleaning efficiencies.
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