At the dropping point, the first drop of the sample falls from the test cup.
The cup is placed in a test tube alongside a thermometer and steadily heated in a oil or air bath.
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? gost 6793
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.
In modern laboratory facilities, this process is automated using specialized instrumentation like the Lintel Kaplya-20U or similar specialized drop point devices. 🚜 Relevance in Lubricant Manufacturing At the dropping point, the first drop of
Complex or polyurea greases intended for extreme operating environments will feature dropping points clearing 230 °C to 250 °C. 🌍 International Equivalents
Formulated under GOST 1033-79, these are intended for low-temperature applications up to about 65 °C. Their dropping points typically register on the lower end, around 75 °C to 100 °C. It indicates the specific temperature at which a
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.