ASTM D2625 Test Method for Endurance (Wear) Life and Load-Carrying Capacity of Solid Film Lubricants (Falex Pin and Vee Method)
1. Scope
1.1 This test method covers the determination of the endurance (wear) life and load-carrying capacity of dry solid film lubricants in sliding steel-on-steel applications.
1.2 The values stated in SI units are to be regarded as the standard except where equipment is supplied using inch-pound units and would then be regarded as standard. The metric equivalents of inch-pound units given in such cases in the body of the standard may be approximate.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
B 16 Specification for Free-Cutting Brass Rod, Bar, and Shapes for Use in Screw Machines
F 22 Test Method for Hydrophobic Surface Films by the Water-Break Test
2.2 U.S. Military Specifications:
MIL-P-16232F Phosphate Coatings, Heavy, Manganese or Zinc Base (for Ferrous Metals)
MIL-L-8937
2.3 Other Standards:
42USC7671a Clean Air Act Ammendments of 1990
Federal Test Methods 791a, Methods 3807 and 3812.
3. Terminology
3.1 Definition:
3.1.1 dry solid film lubricants - dry coatings consisting of lubricating powders in a solid matrix bonded to one or both surfaces to be lubricated.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 endurance (wear) life - the length of test time before failure under a constant loaded condition, in minutes, in which the applied test lubricant performs its function.
3.2.2 load carrying capacity - the highest indicated load sustained for a minimum of 1 min.
3.2.3 gage load, n - the value obtained from the gage while running the test after being corrected to the standard curve using the calibration procedure for the 4500-lbf (20 000-N) reference gage.
3.2.3.1 Discussion - The gage reading is irrespective of the particular gage used, and corrections are made by comparison to the Brinell ball impression diameters on a standard reference copper test coupon with a Rockwell hardness range of HB 37 to HB 39. An electronic calibration instrument is available which can be used in place of the copper coupon.
3.2.4 direct load, n - the load that is applied linearly, bisecting the angle of the vee block corrected to either the 800-lbf (3550-N) gage reference or the 3000-lbf (13 300-N) gage reference.
3.2.4.1 Discussion - This load is equivalent to the true load times the cos 42°.
