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Supercritical fluid cleaning - McHardy J.

McHardy J., Sawan P.S. Supercritical fluid cleaning - Noyes publications, 1998. - 304 p.
Download (direct link): spercrificalfluidcleaning1998.pdf
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YES______ NO________
If not, provide MSDS for all chemicals used in manufacturing.
If the process fluids dry on the part surface, do they appear to form a lacquer by means of polymerization reactions?
YES______ NO________ N/A_______
Are air particle counters (APCs) used to monitor the quality of the manufacturing environment?
YES______ NO________
If so, at what intervals?
DAILY_______ WEEKLY__________ MONTHLY_________ N/A_______
Explain how the APC data is used.
Is deburring done?
YES______ NO________
If so, explain how.
Is deflashing done? YES_________ NO_________
If so, explain how.
Is hand wiping of the surface being done?
YES NO
Is oil being added (on bolt threads, and so on)?
YES______ NO________
If so, explain how it is being removed.
Are there any black box operations at the vendor?
YES______ NO________
If parts undergo a surface treatment such as passivation, polishing, epoxy coating, and so on, are these processes vended out to a secondary supplier?
ALL SOME NONE
Are plating/coating processes at the primary vendor certified and qualified by the customer?
YES______ NO________ N/A________
Are plating/coating processes at a secondary vendor certified and qualified by the customer and by the primary vendor?
YES______ NO________ N/A________
If surface plating/coating is done, are inspection procedures in place for porosity, adhesion, and so on?
YES______ NO________ N/A________
If so, according to what specification?
If soldering is involved, are water-soluble fluxes used?
YES______ NO________ N/A________
If soldering is done, are water-soluble solder pastes used?
YES______ NO________ N/A________
If soldering is done, are no-residue or low-residue fluxes used?
YES NO N/A
A2.3 Degreasing/Cleaning/Drying
Has the cleaning process been documented with the customer?
YES______ NO________
Briefly outline/sketch the cleaning, rinsing, and drying processes.
Is the wash fluid or rinse fluid being recycled?
YES______ NO________
If so, describe the filtration arrangement.
Is online monitoring of fluid cleanliness being done?
YES______ NO________
Are chlorofluorocarbons (CFCs) or other chlorinated solvents used in cleaning and/or drying?
YES______ NO________
If so, what is the estimated consumption of the cleaning (and/or drying) medium per year (in gallons)?
If so, what is the estimated recovery/recycling of the cleaning (and/or drying) medium (as percentage of consumption)?
Is hot air being used for the drying of parts?
YES______ NO________
If so, is the air filtered?
YES______ NO________ N/A_______
If yes, describe the air filtration arrangement
Is the air oil free?
YES NO N/A
Is there a possibility of overloading the cleaner? For example, are grossly contaminated parts being prewashed in the same system where final cleaning is done?
YES______ NO_______
Is there a separate prewash unit to remove gross contamination?
YES______ NO_______
Have cleaner operating parameters (temperature, pressure, flow rate, and so on) been optimized?
YES______ NO_______
Is the cleaning system water based?
YES______ NO_______
If so, is deionized (DI) water being used?
YES______ NO_______ N/A________
If so, is the DI water quality monitored on a continuous basis?
YES______ NO_______ N/A
Describe how cleaner efficiency is monitored and maintained.
How consistent is the cleaning processis there significant part-to-part or lot-to-lot variation?
YES______ NO_______
Is statistical process control (SPC) data on cleanliness being kept?
YES______ NO_______
If so, do the records extend back
A WEEK?______________________________________A MONTH?_A YEAR?_N/A_
Explain briefly how the SPC data is used.
Is MSDS information on all the chemicals used in the cleaning process documented with the customer?
YES______ NO________
If not, provide MSDS for all chemicals used in the cleaning stage.
Are the surfactants used in the cleaning stage compatible with the process fluids used in the manufacturing stage? In other words, are they completely mutually soluble?
YES______ NO________
If process fluids used in machining tend to form a lacquer on the surface of the parts, has the surfactant been chosen so that it can dissolve the lacquer?
YES______ NO________ N/A________
If the detergent contains fatty acids, has the system been designed so that they can be rinsed off?
YES______ NO________ N/A________
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