ASTM G 219 : 2024

1.1This guide is intended to standardize the use of an inclined plane testing device to measure the static (breakaway) coefficient of friction between two bodies. One body is in the form of a “rider” (usually smaller than the counterface) and the other a rectangular flat plane (50 mm to 75 mm by 400 mm) with the counterface material of interest. The rider is placed on the plane and the plane is inclined at an angle to produce motion of the rider. The tangent of the angle at which macroscopic motion of the rider initiates on the angled plane is the breakaway or static coefficient of friction for that sliding couple.

1.2Units—The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.

1.3This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4This international standard 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.