MIL-PRF-3572B
TABLE I. Physical and chemical requirements.
PROPERTY
GRADE A
GRADE B
GRADE C
Viscosity, centistokes (cSt) (mm2/s) at 4° C
90 - 110
-------
-------
Viscosity, cSt (mm2/s) at 99° C
-------
22 - 27
57 (min)
Flash point, degrees C minimum
140
160
160
Pour point, degrees C maximum
- 46
-9
-9
Solids content, weight percent *
2.00 +/- 0.05
10.00 +/-0.25 10.00 +/- 0.25
Ash, weight percent (maximum) *
.75
.75
.75
Hiding power of lubricant containing 2 weight
1,200
1,200
900
percent solids, sq. ft. per gallon (minimum)
*Conversion must be made from weight percent to mass percent for application of verification test methods in section
4.
3.1.3 Stability. After centrifuging, not less than 95 weight percent of the solids shall be in
suspension for grades A and B and not less than 85 weight percent of the solids shall be in
suspension for grade C.
3.1.4 Particle size, grades A and B. Over 50 percent of the graphite particles shall be smaller
than one micron (in largest dimension). The remainder of the graphite particles shall be smaller than
four microns.
3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided the
material meets or exceeds all specified requirements and promotes economically advantageous life
cycle costs.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as
conformance inspection.
4.2 Conformance inspection. Unless otherwise specified, conformance inspection shall
consist of all of the requirements and verifications in table II (see 6.2).
TABLE II. Verification methods.
TITLE
REQUIREMENT
VERIFICATION
Performance Requirements
3.1
4.3
Foreign matter
3.1.1
4.3.3
Viscosity, cSt (mm2/s)
3.1.2, table I
4.3.4
Flash point, degrees C (minimum)
3.1.2, table I
4.3.5
Pour point, degrees C (maximum)
3.1.2, table I
4.3.6
Solids content, mass percent
3.1.2, table I
4.3.7
Ash, mass percent (maximum)
3.1.2, table I
4.3.8
Hiding power
3.1.2, table I
4.3.9
3
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