ASTM D2265 for dropping point of lubricating grease
ASTM D2265 standard test method for dropping point of lubricating grease over wide temperature range
4. Summary of Test Method
4.1 A grease sample in a grease test cup is supported in a test tube placed in an aluminum block oven at a preset constant temperature. A sample thermometer is placed in the tube and so positioned that it measures the temperature in the sample cup without coming in contact with the grease.
4.2 As the temperature increases, at some point a drop of material will fall from the cup to the bottom of the test tube. The reading on the sample thermometer is recorded to the nearest degree as the observed dropping point. At the same time, the temperature of the aluminum block oven is also recorded to the nearest degree.
4.3 One third the difference between the two values is the correction factor which is added to the observed value and recorded as the dropping point of the grease.
5. Significance and Use
5.1 The dropping point is useful to assist in identifying the grease as to type and for establishing and maintaining bench marks for quality control. The results are to be considered to have only limited significance with respect to service performance because dropping point is a static test.
5.2 Cooperative testing indicates that, in general, dropping points by Test Method D2265 and Test Method D566 are in agreement up to 260°C. In cases where results differ, there is no known significance. However, agreement between the manufacturer and purchaser as to test method used is advisable.
