MIL-STD-1330D(SH)
20 September 1996
(a) Each component shall be pre-cleaned using a compatible pre-cleaner and then rinsed with water until all visible soil, particulate, and cleaning agent is removed. Components shall be disassembled to achieve maximum cleanliness. Components which are visibly
clean may eliminate the pre-clean step and proceed directly to the final clean, verification, and rinse step as specified in 5.2.5.
(b) Rinsing of corrosion resistant metals such as stainless steel, nickel-copper (monel), and copper-nickel may use grade C water provided temperatures are less than 140EF. At higher temperatures, or where municipal water supplies leave undesirable deposits, grade B water shall be used.
(c) When using multiple pre-cleaners, rinse between each different pre- cleaner application to prevent any harmful reaction which may
occur when different cleaning agents are combined.
(d) When removing difficult soils such as heavy waterproof greases,
silicone greases, and fluorinated greases, most pre-cleaners will
have limited effectiveness if used without agitation in a soak or
ultrasonic tank. Hand scrubbing is often the best alternative.
(e) Components shall be dried if the delay between completion of pre-
cleaning and start of final cleaning could result in the formation
of rust or other oxides. Otherwise, no specific drying step is
required prior to final cleaning.
5.2.5 Final clean, verification, and rinse. Final cleaning, verification, and rinsing shall be accomplished as follows:
(a) Fully immerse components in an ultrasonic tank or parts washer filled with NOC at 140 to 160EF or TSP at 160 to 180EF.
(b) Energize the ultrasonic tank or parts washer for 5 to 15 minutes.
For software such as O-rings and valve seats, limit exposure to a
maximum of 10 minutes.
(c) Obtain a 500 to 600 mL sample of the used NOC or TSP in a 1-liter
container and verify organic cleanliness as specified in 5.13.2.
If any analysis fails, replace the final cleaner and repeat the
final clean, verification, and rinse process. Do not wait for the
results of 5.13.2 before proceeding to rinsing as specified in
5.2.5(d). When cleaning large quantities of parts on a regular
basis or when cleaning with an automated process, statistical
process control can be implemented (see 6.3). Statistical process
control could entail, for instance, sampling every fourth batch.
If the fourth batch fails, the previous three batches also fail
and require recleaning.
(d) Remove the component(s) from the ultrasonic tank or parts washer
and immediately rinse with grade B water in an ultrasonic tank,
batch tank, or flowing water. The rinse water shall be not less than 110EF for NOC and 120EF for TSP. Continue rinsing until the effluent rinse water pH measured as specified in 5.13.4.2 is 8.0 or less, but rinse for not less than 30 seconds. The preferred rinse process consists of two rinses using an ultrasonic or batch tank as the first rinse followed by a batch tank or flowing water
as the second rinse.
(e) Obtain a sample of not less than 200 mL of the effluent rinse water
and verify particulate cleanliness as specified in 5.13.3. If the
particulate analysis of 5.13.3 fails, replace the rinse water if
applicable and repeat the final rinse step.
5.2.6 Dry, reassemble, and package. Drying, reassembling, and packaging shall be accomplished in an oxygen clean facility as follows:
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