Trial #1
To reevaluate selected cleaners under heated conditions.
Eight cleaners were selected from the previous trial. The same six solutions were diluted with DI water to five percent by volume in a 600 ml beaker. The other two products were diluted to 10% as suggested by the vendor. All eight solutions were heated to 130 F on a hot plate. Twenty-four preweighed coupons were coated with the supplied oil and weighed again. Three couponswere cleaned in a solution for five minutes at room temperature using stir-bar agitation. After cleaning the coupons were rinsed for 15 second in tap water at 120 F and allowed to air dry for two hours. Following the drying, final clean weights were recorded and efficiencies were calculated.
SUBSTRATE MATERIAL: Brass Coupons
CONTAMINANTS: Oil-Texaco Lubricant Company Cleartex D (CAS#: 64742-65-0, 68527-02-6)
CONTAMINATING PROCESS USED: Coupons were coated with oil using a hand held swab.
Heating the solutions improved the cleaning efficiencies for all eight cleaning solutions. Chrisal, SWR Corp, Oakite and Envirosolutions each removed over 90% of the contaminant from the coupons. Table 2 lists the calculated efficiencies for each trial and compares them to the results form Trial 2.
Table 2. Heated Cleaning
| Cleaner
|
Alconox
|
Chrisal
|
Savorgran
|
SWR Corp
|
Valtech
|
C&D
|
Oakite
|
Envirosolutions
|
| Coupon 1
|
60.87
|
97.78
|
61.66
|
97.04
|
76.92
|
79.64
|
96.93
|
83.62
|
| Coupon 2
|
66.03
|
98.72
|
63.27
|
97.26
|
94.19
|
76.02
|
97.71
|
96.48
|
| Coupon 3
|
47.72
|
98.36
|
64.56
|
99.01
|
83.89
|
82.81
|
96.85
|
97.81
|
| Average
|
58.21
|
98.29
|
63.17
|
97.77
|
85.00
|
79.49
|
97.16
|
92.64
|
| Trial 2
|
52.02
|
82.90
|
47.94
|
71.25
|
66.55
|
54.25
|
78.41
|
67.70
|
Heating the solutions improve the removal of the oil from the brass coupons. The solutions with efficiencies over 70% will be evaluated next for removing the rosin solder flux.
No relation