MIL-STD-1330D(SH)
20 September 1996
10 milligrams per liter (mg/L). NOC with greater than 10 mg/L NVR shall be rejected and returned to the vendor or filtered with a 5 micrometer or finer filter and verified less than 10 mg/L NVR
prior to use.
(c) Government purchases of NOC are origin inspected, origin accepted
with a Certificate of Analysis for each lot maintained by the
Defense Logistics Agency. Vendors purchasing NOC should request a
Certificate of Analysis with each delivery. Any NOC returned to a
vendor because of a quality deficiency shall be noted (see 6.3).
4.3.1.6 Dilution. NOC shall be diluted as follows:
(a) Concentration: NOC can be diluted with water up to 50 percent.
NOC shall be diluted 50 percent with grade A or B water when
cleaning aluminum or anodized aluminum.
(b) Water quality: The preferred quality of water is 5 micrometer
nominal or finer filtered grade A water. For long term use in
cleaning equipment, such as an ultrasonic cleaning tank, parts
washer, or flushing rig, grade B water may be used with a 1
micrometer nominal or finer filter installed. For short term use,
such as a few hours, grade B water may be used with no filter.
(c) Order for mixing: In order to yield a more stable solution which
will extend the life of the cleaner, water should be added to NOC
rather than adding NOC to water.
4.3.1.7 Use of NOC in previously used equipment. For cleaning equipment previously used with other than NOC, the following actions should be taken to minimize and evaluate for the possibility of the NOC reacting with the residue left behind.
(a) Fill the cleaning equipment with NOC diluted 25 to 50 percent with grade B water.
(b) Operate the cleaning equipment covered for 4 hours at 140 to 160EF. (c) Visually inspect the NOC for foam and precipitate. Visually
inspect the equipment for milky white deposits. Some white deposits at the fluid-air boundary are acceptable.
(d) If precipitate is visible in the NOC, the NOC foams, or milky white deposits are visible on the equipment in areas continuously wetted with NOC, discard the NOC solution, remove the deposits as specified in 4.3.1.7(e), and repeat the process.
(e) Deposits can be removed by soaking in hot water, or soaking and scrubbing with commercial white vinegar or a warm (up to 110EF) 10 to 16 percent citric acid solution followed by a water rinse. A
10 to 16 percent citric acid solution can be prepared by adding 12 to 20 ounces of powdered citric acid (CAS No. 77-92-9) to one gallon of water.
4.3.1.8 Use for extended periods. Extended use of NOC should be in covered equipment to minimize evaporation. NOC can be recycled using filtration, and continuously used or reused, provided the following conditions are satisfied:
(a) A shake test as specified in 5.13.2.2 reveals no excessive foam. (b) A visual inspection as specified in 5.13.3.2 reveals no
particulate, fiber, or oil.
(c) A hydrocarbon or NVR inspection as specified in 5.13.2 reveals less
than 5 parts per million (ppm) above baseline.
(d) An alkalinity test as specified in 5.13.5 indicates a satisfactory
result. As the alkalinity of NOC is depleted in use, the volume
of NOC required to obtain the blue end-point specified in 5.13.5
increases. When the alkalinity test measures 35 to 40 milliliters
(mL) of NOC, the NOC is at risk of developing an insoluble
precipitate. The NOC should either be replaced, or a portion of
the low alkalinity NOC removed and replaced with fresh NOC to
restore alkalinity. If evaporation concentrates the NOC causing
the alkalinity test to measure less than 10 mL of NOC, the NOC
should be diluted with water as specified in 4.3.1.6 to restore
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