Standards Development

Scope

This test method covers the determination of a scuffing temperature of lubricating oils at prescribed conditions and the retention of friction over temperature by a load step increases in a roller-on-disk (flat) geometry when subjected to high-frequency, linear oscillation motion. This test method is executed under constant load, frequency and stroke in a SRV-type test machine. The evolution of coefficient of friction of lubricating oils as function of temperature is recorded and assessed.

Tribometrical tests initiate scuffing so far by a) constant load step increases, e.g. as in 4-ball (ISO 20623:2017 [4]) or TIMKEN, or b) constant Hertzian contact stress step increases, e.g. as in FZG (ISO 14635-1:2023 [5]). This test method determines the upper temperature for operating a lubricant and can also be used to determine the ability of a non-EP lubricating oil to protect against scuffing with increasing temperature  [2].

The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

This document 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

This document was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.