To evaluate selected cleaners for the removal of the solder flux.
Date Run:
02/07/2000
Experiment Procedure:
Five cleaners were selected from the previous trial. Three 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. Fifteen preweighed coupons were coated with the supplied flux and weighed again. Three coupons were 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 dried using a Master Appliance Corp, Hot-air gun model HG-301A at 500 F for one minute. Following the drying, final clean weights were recorded and efficiencies were calculated.
SUBSTRATE MATERIAL: Circuit Board coupons
CONTAMINANTS: Flux-Kester Solder 1544 Rosin Solder flux (CAS#s: 64-17-5, 78-92-2, 8050-09-7) CONTAMINATING PROCESS USED: Coupons were coated with oil using a hand held swab.
Trial Results:
Only SWR Corp and Envirosolutions were effective in removing over 85% of the flux from the coupons. Valtech removed just over 75% with the other two cleaners cleaning less than 35%. Table 2 lists the calculated contaminant removal rates for each cleaner tested.
Table 2. Cleaning Efficiencies
Cleaner
Chrisal
SWR Corp
Valtech
Oakite
Envirosolutions*
Coupon 1
23.18
86.30
72.53
2.66
93.43
Coupon 2
45.74
83.35
80.66
10.08
99.39
Coupon 3
35.45
87.81
72.57
70.95
95.99
Average
34.79
85.82
75.25
27.90
96.27
As noted in the table, when Envirosolutions Bio-T Max was heated at the 10% dilution, a white particulate matter was formed. Rinsing this white material off the coupons was some what difficult and a second tap water spray was used for 20 seconds.
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
SWR Corp SWR One and Envirosolutions Bio-T Max were both moderately successful in removing the flux from the circuit board coupons. A follow test will be conducted to evaluate SWR Corp and Valtech at higher concentrations (10%) and Bio-T Max at room temperature.
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