ASTM D5182 Evaluating the Scuffing Load Capacity of Oils (FZG Visual Method)
1. Scope
1.1 This test method, the Forschungstelle für Záhnräder und Getriebebau (Research Site for Gears and Transmissions) Visual Method, commonly referred to as the FZG Visual Method, is intended to measure the scuffing load capacity of oils used to lubricate hardened steel gears. Scoring, a form of abrasive wear, is also included as a failure criteria in this test method. It is primarily used to assess the resistance to scuffing of mild additive treated oils such as industrial gear oils, transmission fluids, and hydraulic fluids. High EP type oils, for example, those oils meeting the requirements of API GL-4 and GL-5, generally exceed the capacity of the test rig and, therefore, cannot be differentiated with this test method.
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
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. For specific safety information, see Section 7, Section 8, 9.2, and 9.3.1.
2. Referenced Documents
2.1 ASTM Standards:
D235 Specification for Mineral Spirits (Petroleum Spirits) (Hydrocarbon Dry Cleaning Solvent)
G 40 Terminology Relating to Erosion and Wear
2.2 DIN Standard:
DIN 51 354 Teil 1: FZG Zahnrad Verspannungs Prüf maschine - Allgemeine Arbeitsgrundlagen
3. Terminology
3.1 Definitions:
3.1.1 scratches - the result of mechanical removal or displacement, or both, of material from a surface by the action of abrasive particles or protuberances sliding across the surfaces.
3.1.2 abrasive wear - wear due to hard particles or hard protuberances forced against and moving along a solid surface.
3.1.3 adhesive wear (scuffing) - wear due to localized bonding between contacting solid surfaces leading to material transfer between the two surfaces or loss from either surface.
3.1.4 scoring - a severe form of wear characterized by the formation of extensive grooves and scratches in the direction of sliding.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 polishing - a mild form of abrasive wear resulting in minor loss of material and typically characterized by a smooth finish and removal of all or part of the initial grinding marks.
