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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 cleaners. 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 most friendly 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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