MIL-DTL-53131A
3.6 Lubricity. When tested in accordance with 4.5, table V, wear scar values for the lubricating oil
shall not exceed those specified in table III.
TABLE III. Wear scar values.
Test load, Newtons
Wear scar, mm, max.
Grade 4
Grade 6
Grade 9
Grade 14
Grade 40
400
0.90
0.90
0.90
0.90
0.90
150
0.35
0.35
0.35
0.35
0.35
3.7 Solid particle contamination. When tested in accordance with 4.5.2, the number of solid
contaminant particles per 100 mL of the fluid shall not exceed the number specified in table IV. The
weight of the residue by gravimetric analysis shall not exceed 0.3 mg/100 mL.
TABLE IV. Solid contaminant particles.
Particle size range
Allowable number (max)
(largest dimension) micrometers
each determination
5-15
150
16-25
45
26-50
23
51-100
10
Over 100
0
3.8 Storage stability. After 12 months of storage in accordance with 4.5 (FED-STD-791,
method 3465), the fully blended product shall show no separation of ingredients nor evidence of
crystallization. The blended product shall be clear and transparent when examined visually, and shall
conform to the requirements of section 3, except particulate contamination.
3.9 Workmanship. The lubricating oil shall be a homogenous, clear and bright liquid free from any
visible impurities.
3.10 Containment packaging. The unit of issue quantity of oil shall be packaged in an amber
glass bottle (e.g. shape defined by the Glass Packaging Institute (GPI)). The container stability
must minimize customer-handling problems. A poly seal cap shall be used to insure seals do not
fail under normal handling. The protective containment package must contain the product so that
neither the contents escape; maximize the product shelf-life; and prevent any contamination of the
product.
3.11 Labeling: Each containment bottle will contain the following special label markings in
addition to all markings required by the contract or order.
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