MIL-PRF-14107D
b. The Gooch crucible to be used is described as follows:
Filtering crucible, fritted glass disk, low form Gooch type,
Pyrex brand, 30 ml capacity, medium porosity, 14 microns
nominal maximum pore size.
c. Prepare the Gooch crucible as follows: Screen white, sharp
silica sand through a No. 40 sieve conforming to ASTM E11 and
ASTM E323. Transfer the sand remaining on the sieve to a
beaker and wash it with 6 normal hydrochloric acid, 6 normal
sodium hydroxide, and hot distilled water or water of equal
purity until the rinse water is neutral to litmus. Wash the
sand with methyl alcohol. Wash the crucible with hot glass
cleaning solution (potassium dichromate and sulfuric acid),
distilled water or water of equal purity, and methyl alcohol.
Place 25 grams of the cleaned sand in the crucible and wash
it several times with distilled water or water of equal
purity and methyl alcohol to distribute the sand uniformly.
Place the crucible and contents in a gravity convection oven
maintained at 250o + 5oF (121.1o + 2oC) for 15 + 2 minutes.
Remove the crucible from the oven, cool it and weigh it to
within 0.2 mg. Repeat the heating and cooling until a
constant weight is obtained.
d. After filtering the liquid contents through the tared Gooch
crucible, rinse the container with 25 ml of distilled water
or water of equal purity, and filter the washings through the
Gooch crucible.
e. After completing the test the following determinations shall
be made:
1. The change in the weight of the copper strip shall not
exceed 0.5 mg per square centimeter of surface.
The neutralization number of the oil shall not have
2.
increased by more than 0.5 mg KOH from the original
neutralization number of the oil.
The viscosity of the oil at 100oF (37.8oC) shall not have
3.
changed by more than + 20% from the original viscosity of
the oil.
The neutralization number of the aqueous portion shall not
4.
exceed mg KOH.
The amount of insoluble material produced during the test
5.
shall not be greater than 0.5% by weight of the original
oil sample.
The amount of insoluble material produced during the test shall not
be greater than 0.5% by weight of the original oil sample. Oil
containing insoluble material in excess of 0.5%, and/or an increase
in neutralization number of the aqueous portion by more than 0.5% mg.
KOH, shall be cause for rejection.
4.3.2.2 Swelling of synthetic rubber. The oil shall be tested for 168
hours at 158o + 5o F (70o + 2oC) in accordance with FED-STD-791, Method
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