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 #2 will have the part's blind holes facing down coming directly in contact with the Ultrasonic waves.
Trial Results:
Trial #2- Looks a heck of a lot better, there appears to be absolutely no fines on the surface of the parts or the screw heads, but there are still a few fines left in the holes most of these are probably burrs. Burrs won't be solved with cleaning, this is a machining issue.
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Trial #2- To remove the remaining fines, the cleaning time should be bumped up to 20 minutes and a little rinse agitation should be used.
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The Toxics Use Reduction Institute at the University of Massachusetts Lowell (“TURI”), is a state agency and public institution of higher education, formed under MGL c. 75, and the Toxics Use Reduction Act (“TURA”), MGL c. 21I.
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