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Trial Number 0

Trial Purpose:

To remove microscopic metal fines

Date Run:

07/10/1995

Experiment Procedure:

The purpose of this trial is to find a viable way for Adhesive Manufacturer to remove microscopic metal fines from a variety of stainless steel pump seals. Because of the blind holes in the seals, we feel it is necessary to use Ultrasonics. Part orientation in the bath is the variable which will be looked into closely.
WR Grace Daraclean 283 at 10% will be used at 150 F for 15 minutes. The parts will then be rinsed in Tap water and then DI water, both for 5 minutes at 150 F. The parts will then be dried under air knives for two minutes and then in a convection oven for 60 minutes at 140 F. After drying, the parts will be examined under a microscope.
Trial #1 will have the part's blind holes facing the side of the tank, perpendicular to the ultrasonic waves.

SUBSTRATE MATERIAL:Stainless Steel pump seals
CONTAMINANTS:light oils and metal fines

Trial Results:

Trial #1-  Visually it looks like very good removal except for a few of the blind holes.  Upon inspection with the microscope, very small fines were in most the holes, and a few were on the surface of the part.  The screw holes appear free of fines.   

Success Rating:

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

Conclusion:

Keeping the blind holes facing down dramatically improves the fine removal.  If  a slight amount of fines is acceptable in the blind holes, spray washing will probably suffice.   

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