F-F-351F
a. Straight mineral oil shall conform to MIL-PRF-2104, grade 10 or equivalent
commercial oil approved by the Government in the inspection test plan.
b. Additive oil is designated as Approved Filter Test Oil, RFO-3-93 conforming
to SAE J1260 or equivalent SAE approved by the Government in the
inspection test plan.
4.5.6 Constituents in standardized oil filter test contaminant (SOFTC-2A and ISO 4572).
The composition of the standardization contaminant slurry required (see 6.4.1), for the test
methods specified herein, shall be as follows:
a. Sixteen parts by weight of carbon black; average particle size, 85 nanometers.
b. Two parts by weight of ferric oxide; 95 percent of the particles in the range
from 0 to 5 micrometers.
c. Four parts by weight of polyvinyl (PV) resin (see 6.4.4).
d. Seventy-eight parts by weight of the test oil (see 4.5.5 and 6.4.5).
4.5.6.1 Preparation of SOFTC-2A. Preparation of SOFTC-2A shall consist of the
following:
a. All of the carbon black and 20 to 25% of the test oil required by the above formula
shall be placed in a mechanical mixer and mixed at slow speed.
b. The mixture from (a) above shall be milled over a conventional paint roller mill.
The resultant paste shall be collected directly from the mill into a container having
an additional 25% of the original quantity of oil. The milled slurry and the oil shall
be mixed until a homogeneous mixture is obtained.
c. A dry-mix of the remaining solid constituents, i.e., the PV resin and ferric oxide,
shall be prepared. To this dry-mix, the slurry from (b) above shall be slowly added
until a stiff paste is obtained. The balance of the slurry and the remainder of the
lubricating oil shall be added to this paste and mixed until homogeneous.
4.6 Test methods. The contractor's testing shall adhere to the limitations of the following
items as described below.
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