Dropping Point

In general, the dropping point is the temperature at which the grease passes from a semisolid to a liquid state under the conditions of test. The dropping point is useful to assist in identifying the grease as to type and for establishing and maintaining bench marks for quality control.

A dropping point test, also known as ASTM Method D-2265 & D-4950 , determines the cohesiveness of the oil and thickener of a grease. Dropping point tests are used for quality control to verify that the soap structure has been formed correctly and will withstand high temperatures.

Another test provided: ASTM D566, DIN 51801, FTM 791-1421, IP 132, ISO 2176

Results

White Antifriction Grease 277 ºC

The ASTM D2265 dropping point test permits higher temperatures than the ASTM D566 method and uses a different heating procedure: the test cell is inserted in an aluminum block oven maintained at a constant temperature that is higher than the expected dropping point of the sample. The sample temperature then rises to the dropping point without operator control.

TEST Provided: ASTM D566, D2265, DIN 51801, FTM 791-1421, IP 132, ISO 2176

Dropping point determinations are used for identification and quality control purposes, and can be an indication of the highest temperature of utility for some applications. The sample is heated at a prescribed rate in a precision machined cup whose sides slope toward an opening at its center. The temperature at which a liquid drop first falls from the cup is the dropping point of the sample.

4 Balls EP

The Four Ball Tester can be used to determine Extreme Pressure properties (EP) and friction behavior of lubricants and greases. A rotating steel ball is pressed against three steel balls firmly held together and immersed in lubricant or greases under load.

The failure of lubricant is indicated by welding of the bottom three balls to the top ball. The load at which welding occurs is the index of extreme pressure property of the lubricant or grease.