VV-G-671G
avoid prolonged contact with the skin and while observing Occupational Safety and Health Administration (OSHA) guidelines. Questions pertinent to this effect shall be referred by the contracting activity to the contracting agency.
3.3 Chemical and physical requirements.
3.3.1 Requirements for the base stock. The base stock shall consist of mineral oil conforming to the requirements specified in table I.
TABLE I. Requirements for the mineral oil base.
Property Value
Viscosity at 40 °C, kinematic, centistokes
3.3.2 Requirements for the finished grease. The finished grease shall conform to the requirements specified in table II.
TABLE II. Requirements for the finished grease.
Characteristics |
Limits |
Mineral oil base, % min |
75 |
Worked penetration (1/10 mm) |
265-295 |
Four-ball weld point, kg, min |
160 |
Four-ball wear, scar diameter, mm, max |
0.600 |
Dropping point, °C, min |
85 |
Water content, %, max |
1.5 |
Free fatty acid, as oleic, % max |
0.2 |
Free alkali, as Ca(OH)2, % max |
0.2 |
Ash, as sulfates, % max |
5.0 |
Corrosion, copper strip classification |
lb |
Graphite content, % wt |
|
min |
4.5 |
max |
5.5 |
3.3.3 Graphite content. The grease shall contain approximately five percent of microfine graphite can meet the requirements for minimum weld load. If the graphite is of sufficiently
high purity, the grease can also meet the requirements for four-ball maximum wear scar diameter
(see 3.2 and 6.3).
4
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