FED-STD-791D
Method 313.3
September 30, 1986
PENETRATION OF LUBRICATING GREASES AFTER PROLONGED WORKING
1. SCOPE
1.1 This method is used for determining the consistency of lubricating greases that have
been subjected to severe mechanical working.
2. SUMMARY
2.1 The method consists of working the grease mechanically under specified conditions
for 100,000 double strokes (approximately 28 h), then checking the worked penetration in
accordance with ASTM D 217.
3. SAMPLE SIZE
3.1 Sufficient grease to be tested to pack grease worker.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Grease worker, as specified in the "Cone Penetration of Lubricating Grease" ASTM
D 217, with the following differences:
a. Machine grease-working, 60 double strokes per minute.
b Plunger plate, 270 holes 0.16-mm (1/16-in) diameter, arranged as in Figure 1.
5. MATERIALS
5.1 CAUTION - SOME MATERIALS ARE TOXIC AND HAZARDOUS. The
chemical materials listed in this section must be handled carefully. Federal Test Method 10000,
Material Handling Safety Precautions, is a reference which lists all toxic and hazardous materials
cited in FTMS 791. The synonyms, life hazard, flammability, handling and storage precautions,
emergency treatment and measures, and spill practices of each chemical are explained.
5.2 Grease to be tested.
6. PROCEDURE
6.1 Pack sample in grease worker, and assemble and vent grease worker as described in
"Procedure for Worked Penetration" of ASTM D 217.
6.2 Mount grease worker in machine and work grease for 100,000 double strokes while
maintaining the ambient temperature at 25 " 1C (77 " 2F).
26
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business