A small grease sample is packed into a specialized metal cup with a standardized hole at the bottom.

is the state standard used across Russia and the CIS region to define the test method for determining the dropping point of petroleum products, primarily lubricating greases.

Complex or polyurea greases intended for extreme operating environments will feature dropping points clearing 230 °C to 250 °C. 🌍 International Equivalents

Note: While identical in premise, subtle variations in heating rates or cup dimensions between these standards can result in slight numerical differences in the final recorded temperature.

The dropping point is a critical physical indicator in tribology (the study of friction and wear). It indicates the specific temperature at which a grease passes from a semi-solid to a liquid state under controlled conditions. 🔍 What is the Dropping Point?

Technicians monitor the cup. The exact temperature recorded on the thermometer when the first drop falls through the bottom hole is officially cataloged as the dropping point.

The cup is placed in a test tube alongside a thermometer and steadily heated in a oil or air bath.