MIL-PRF-83772C
6.7 Markings for shipment and storage. In the past, the provisions of MIL-STD-129
have been specified as guidance for marking for shipment and storage.
6.8 Parts marking. In the past, the provisions of MIL-STD-130 have been specified as
guidance for parts marking.
6.9 NVR determination. The following process has been used successfully in the past to
determine the amount of NVR in the solvent samples.
a. Dry a 125 milliliter capacity platinum (or high-silica glass) evaporating dish in an
oven at 221 ±9°F and cool in a desiccator. Repeat until the weight is constant or within 0.1
milligram of the previous weighing. Using a scale accurate to 0.1 mg or less, record this last
weight. Rinse a clean-dry 1000 milliliter volumetric flask with an acceptable oxygen-safe
solvent, and then fill it with the filtered solvent saved from the particulate test. Invert the
evaporating dish, place it over the mouth of the flask, hold it firmly in place and invert the flask.
In this position, place both dish and flask on a steam bath or suitable heat source. Adjust a ring
support to hold the flask so the mouth of the flask is 1 in. above the bottom of the evaporating
dish. Thus held, the flask automatically feed the solvent to the dish during evaporation (Caution
the test should be run in a ventilated, dust-free area).
b. Evaporate the sample of filtered solvent to dryness. Remove the dish from the steam
bath or suitable heat source with metal tongs and blot the outside of the dish with a lint-free
tissue or equivalent.
c. Place the dish in an oven at 221 ±9°F for approximately 1 hour. Cool in a desiccator
and weigh the dish. From this weight, subtract the weight of the empty dish obtained in a. above.
The difference is the weight of the NVR.
6.10 Subject term (key word) listing.
Abrasion
Nitrogen, liquid
Oxygen, liquid
Pressure
Purge
Solvent
Test, non-volatile residue
Test, particulate
Valve
6.11 Changes from previous issue. Marginal notations are not used in this revision to
identify changes with respect to the previous issue due to the extent of the changes.
11
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business