> [[LIGO Cleaning Presentation.pdf|LIGO Cleaning Presentation]] [[BATH-O-CARD]] ## Principle [[Detergent and stripper ingredients]] ![[Screen Shot 2022-02-13 at 7.02.13 PM.jpg]] ## Method ==Applications:== non-porous materials, simple shapes that can be rinsed and dried ==Limitations:== difficult to eliminate silicones since they float on the bath surface; surface oxides and some alloys can be etched by the basic solution ### Steps 1. Water and detergent bath - pH is basic (9.6 for CERN) 2. Heated [[Ultrasonic Agitation]] 3. Rinsing with DI or tap water - first effective control -> verification of surface wetting by the rinsing water 4. Rinsing in DI water bath 5. Drying in oven or dry nitrogen ### Parameters Cleaning time is a function of: - contamination amount - part shape - brittleness - surface roughness - vessel size Bath quality must be monitored (often filtered and recycled) - Conductivity - pH - Detergent concentration