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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
Success Rating:A follow up test, usually based on company input.
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.