MIL-STD-1622B(SH)
in NOC. As an example, NOC with only 5 mg/L NID will develop a stable foam visible after 30 minutes. The presence of foam is often the result of carry- over from a preclean step. However, the shake test is used only to determine the presence of organic or particulate contamination. A shake test will not detect insoluble organic contaminants such as oil or grease, and, therefore, shall not be used to establish the absence of organic contaminants.
5.14.3 Particulate and clarity inspection methods.
5.14.3.1 White light visual particle inspection. Samples shall be visually inspected for particulate contamination. Inspection shall be performed by a person with normal visual acuity, natural or corrected, under bright white light of at least 100 foot-candles. A general purpose two D-cell flashlight, in good condition, at a distance of no greater than 18 inches directly above a surface will illuminate the surface with an intensity of not less than 100 foot-candles. Samples shall be inspected in a chemically compatible clear container or clean white dish. Any visible particles shall
be cause for rejection. This visual inspection corresponds to a quantitative limit of no particles greater than 50 micrometers.
5.14.3.2 White light visual clarity inspection. Samples shall be visually inspected for clarity. Inspection shall be performed by a person with normal visual acuity, natural or corrected, under bright white light of at least 100 foot-candles. A general purpose two D-cell flashlight, in good
condition, at a distance of no greater than 18 inches directly above a surface will illuminate the surface with an intensity of not less than 100 foot- candles. Samples shall be inspected in a chemically compatible clear
container or clean white dish. Any visible turbidity from contaminants such as oil, grease, sediment, paint chips, bead blast, or resin beads shall be cause for rejection. Evidence of not greater than 3 particles is acceptable.
5.14.4 Rinse water pH analysis. When specified, the pH of rinse water shall be determined using a pH probe, litmus paper, or phenolphthalein indicator solution. Three drops of phenolphthalein indicator solution in a
100 mL sample will appear colorless or a very slight pink when the pH is 8.0 or less.
5.14.5 NOC alkalinity. When specified, the alkalinity (hydroxide concentration) in NOC shall be evaluated as follows:
5.14.5.1 Equipment.
(a)A balance accurate to 0.01 grams with a zero drift less than 0.01 grams, and a capacity sufficient to prepare reagent solutions as specified in 5.14.5.3. Suitable balances are available through laboratory supply houses such as Thomas Scientific and Cole- Parmer.
(b)Beakers or erlenmeyer flasks of 100 to 250 mL capacity, plastic or glass; or equal.
(c)Graduated cylinder to 50 to 100 mL capacity, plastic or glass; or equal.
(d)Eye dropper or pipette, plastic or glass; or equal. (e)Syringe or buret, 35 to 50 mL capacity, with 1 mL graduation
intervals, preferably plastic; or equal.
5.14.5.2 Reagents.
(a)Potassium acid phthalate or potassium biphthalate (KHP), CAS No.
877-24-7, primary standard or acidimetric standard, crystals, ACS
reagent grade or better, available from chemical supply houses
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