Cleaning was performed in the Crest Ultrasonic unit for 15 minutes at 140 F. The parts were then rinsed in a tap water bath and then a DI water bath, both at 140 F and for 5 minutes. The parts were then dried under air knives for two minutes and then under an IR lamp for 30 minutes. The parts were then analyzed for cleanliness by visual inspection for residual oil and/or water spotting. A water break test was used to detect any non-visible oil. For a oil-free surface, the water should sheet off where the water would bead up on a contaminated surface.
CLEANING CONDITIONS:
time (min)
Temp (oF)
Ultrasonics
15
142
#1 RINSE/TAP H2O
5
139
#2 RINSE/DEIONIZED H2O
5
142
DRY air knives
2
room
DRY- IR Lamps
30
105
Clear Polycarbonate pieces Fingerprints and light oils
Trial Results:
Parts came out very clean, no visible contamination and the water sheets off evenly thus indicating a clean surface. Drying time can be cut down considerably since most of the water is blown off by the air knives (10 minutes would probably be adequate).
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 Sea Wash Neutral appears to be a cleaner that would be suitable for Biomedical Device Manufacturer's needs.
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