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Trial Number 0

Trial Purpose:

Identify cleaners to remove flux and Hummiseal

Date Run:

01/02/1996

Experiment Procedure:

Twelve various circuit boards obtained from a receiver were cut down to a smaller size (approximately 3"x 3") and precleaned. Each part was weighed after precleaning and then contaminated with Humiseal 1B31 and Ersin 5381 RMA Flux. Both contaminants were allowed to set on the parts for six days in a convection oven set at 110 F. The parts were then weighed before cleaning.
Six different chemistries were tested for removal of both the flux and the Humiseal. All chemistries were used at their maximum recommended concentration, and at recommended temperatures.
SUBSTRATE MATERIAL: Circuit Boards
CONTAMINANTS: Humiseal 1B31& Ersin 5381 RMA Flux
CONTAMINATING PROCESS USED: Flux and coating applied on with a brush and allowed to set for 6 days.
A cleaning time of 15 minutes was used for each cleaner. Rinsing was performed in a tap water rinse tank of 130 F for one minute. The parts were run under air knives for 1 minute and then placed in a convection oven at 140 F for 20 minutes to dry. After drying, the parts were weighed again to get a percent removal of contaminants and inspected under a black light to see how much residual contaminant was present.

Trial Results:

Gravimetric results were all screwed up so the results will not be judged on them.
Two chemistries seemed to show potential. Tech Spray Defluxer and WR Grace Daraclean 282. The Daraclean 282 removed all flux. The humiseal was not removed, but started to peel off after 15 minutes. After drying the humiseal was quite tacky on both of the circuit boards. The Tech Spray has a dissolving action on the Humiseal which I feel will end up in better cleaning than a lifting action. A slight bit of flux remained on the Tech Spray boards.
The Chemtronics, Valtron, Armakleen 2001 and Innovative Organics cleaners were all ineffective in removing both contaminants and will not be tested further.

GRAVIMETRIC RESULTS

Cleaning Solution: Tech Spray Inc. Aqueous Defluxer                                                                             

sample # clean mass (g) mass with contamination (g) mass after cleaning (g) contaminant removed (g) Percent Removal
1 34.0402 34.4275 34.4950 ‑0.0675 ‑17.43%
2 22.5303 22.9010 22.8220 0.079 21.31%
        Average 1.94%

 

Cleaning Solution: Chemtronics Super Bio-Wash

sample # clean mass (g) mass with contamination (g) mass after cleaning (g) contaminant removed (g) Percent Removal
3 18.5089 18.9178 18.9144 0.0034 0.83%
4 16.7197 17.1085 17.1187 ‑0.0102 ‑2.62%
        Average ‑0.90%

 

Cleaning Solution: Valtech Corp. Valtron SP2201

sample # clean mass (g) mass with contamination (g) mass after cleaning (g) contaminant removed (g) Percent Removal
5 16.1899 16.4580 16.4592 ‑0.0012 ‑0.45%
6 25.0008 25.2955 25.2718 0.0237 8.04%
        Average 3.80%

 

Cleaning Solution: Innovative Organics SC11                                                                            

sample # clean mass (g) mass with contamination (g) mass after cleaning (g) contaminant removed (g) Percent Removal
7 24.8917 25.2485 25.1977 0.0508 14.24%
8 21.9369 22.0782 22.0415 0.0367 25.97%
        Average 20.11%

 

 Cleaning Solution: Church & Dwight Armakleene E-2001

sample # clean mass (g) mass with contamination (g) mass after cleaning (g) contaminant removed (g) Percent Removal
9 19.7927 20.1263 20.1480 0.0217 6.50%
10 14.9243 15.2423 15.2331 ‑0.0092 ‑2.89%
        Average 1.81%

 

Cleaning Solution: WR Grace Daraclean 211                                                                            

sample # clean mass (g) mass with contamination (g) mass after cleaning (g) contaminant removed (g) Percent Removal
11 23.1156 23.3780 23.3075 0.0705 26.87%
12 14.9087 15.0416 15.0259 0.0157 11.81%
        Average 19.34%

Success Rating:

Test incomplete or inconclusive.

Conclusion:

Cleaning time will have to be increased. Temperature should be kept as high as possible without damaging parts (maximum temp of 150-160 F). If longer cleaning times are not effective, new chemistries will have to be scoped out. Possible chemicals to be ordered:
Finger Lakes Company-Semi-Aqueous Electrical Cleaner
ADF Systems Ltd-Nutraclean 9 aqueous cleaner
Chem-Tech International-CT-24 Flux Remover
Envirosense Inc.-Envirogold Aqueous Cleaner
Rochester Midland Corp.-Alpha Excel
Terpene Tech.-Tarksol Semi Aqueous Terpene
Today & Beyond- Beyond 2003
London Chemical Co.-Longoterge

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