MIL-DTL-53131A
3.3.3 Toxic products and formulations. The material shall have no adverse effect on health of
personnel when used for its intended purpose. Questions pertinent to the effort shall be referred by the
contracting activity to the appropriate departmental medical service who will act as an advisor to the
contracting agency.
3.4 Physical properties. The physical properties of the lubricating oil shall be in accordance with
physical properties appearing in table I, when tested as specified in 4.5.2 through 4.5.2.2.
TABLE I. Physical properties.
Property
Requirements
Grade 4
Grade 6
Grade 9
Grade 14
Grade 40
Acid number, mg KOH/g (max)
0.1
0.1
0.1
0.1
0.1
2
Viscosity, mm /s
100 °C (212 °F), min.
3.5
5.4
9.0
13.5
38.0
40 °C (104 °F), max.
18.5
33.0
75.0
130.0
420.0
-40 °C (-40 °F), max.
3500
7900
30000
--
--
Pour point, °C (°F), min.
-62 (-80)
-57 (-70)
-54 (-65)
-40 (-40)
-27 (-15)
Flash point, °C (°F), min.
227 (440)
227 (440)
234 (453)
245 (473)
273 (523)
Evaporation % by weight, max.
5.0
3.0
3.0
2.0
1.0
22 hrs., 149 °C (300 °F)
3.5 Corrosiveness and oxidation stability. When the lubricating oil is tested as specified in 4.5.1, it
shall meet the following requirements:
3.5.1 Corrosion. The weight of the silver and steel strips shall not have changed by more than
0.2 milligrams per square centimeter of surface for each strip; the weight change for the aluminum shall
be not more than 0.4 milligrams per square centimeter of surface, and the weight change for the copper
shall be not more than 0.6 milligrams per square centimeter of surface.
3.5.2 Resistance to oxidation. After the oxidation corrosion test (see 4.5.1) is completed, the
viscosity of the oil at 40 °C (104 °F) and the acid number shall not have changed by more than the
values shown in table II.
TABLE II. Resistance to oxidation.
Corrosion-oxidation
Requirement
Grade 4
Grade 6
Grade 9
Grade 14
Grade 40
% Viscosity change @ 40 °C
+30.0
+10.0
+5.0
+5.0
+5.0
(104 °F), max.
Change in acid No., max.
4.5
3.0
3.0
3.0
3.0
5
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business