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Trial Number 2

Trial Purpose:

To evalaute possible alternatives form hummiseal and flux removal

Date Run:

01/18/1996

Experiment Procedure:

Twelve various circuit boards obtained from a receiver were cut down to a smaller size (approximately 3"x 3") and precleaned. The Flux and Humiseal was applied on all boards with a swab. Both contaminants were allowed to set on the parts for six days in a convection oven set at 110 F.
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.
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 inspected for cleanliness. Black light was used to detect the Humiseal coating, and the flux was detected by simple visual examination.

Trial Results:

The six cleaners were rated in 3 categories (flux removal, humiseal removal, environmental health & safety).  Ratings were done on a scale of one to six with one being the best tested.  

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%

Tech Spray Defluxer-Removed all but a small portion of flux, showed some removal of the Humiseal. Not the friendliest chemical, contains 35-40% Diethylene Glycol Monomethyl ether. Super Bio-Wash-Performed poor in all three categories. Valtech Valtron 2200-Wasn't too effective in removing the flux, didn't even touch the Humiseal. Innovative Organics-A majority of the flux was removed, didn't even touch the Humiseal. Armakleen E-2001-Removed all flux and softened up the Humiseal quite a bit. Very worker friendly chemical. Daraclean 282-Removed all flux and started to lift up the Humiseal. Contains up to 3% Glycol Ethers.

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.

Conclusion:

The Ersin RMA flux should not be a problem to remove with most aqueous defluxers. Out of the chemistries tested, the Armakleen E-2001 and the Daraclean 282 performed the best and should be considered by Radar Technology, Inc.
The Humiseal coating will be very tough to remove. We are currently ordering chemicals that will hopefully remove the Humiseal. Products are expected from Terpene Technologies, Finger Lakes Chemical and Ecolink in a few weeks.

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