Lithium soap is the most important thickening additive in industrial greases. ICP spectroscopy will provide information on the depletion or not of lithium and detect small wear metal particles (less than 6 microns).
Dropping Point of Lubricating Grease - ASTM D566 (Code: GDP)
The Dropping point of a lubricating grease is the temperature at which the grease passes from a semi solid to a liquid state. This grease test establishes and maintains benchmarks for quality control, while identifying the type of grease sampled.
Water % in Grease - PMC Method (Code: WGRS)
GRSPQ - (Code: GRSPQ)
A combination of ICP spectroscopy and Particle Quantifier Index (PQ) will detect wear metal particles and ambient dirt contaminants.
Both these tests are complementary: spectroscopy will provide information on the depletion or not of lithium and detect small wear metal particles. PQ will detect wear metal particles regardless of their size, where the concentration, hardness and larger particles may end up causing critical damage.
Ferrous Debris Mag./Grease - GE Method (Code: FDM)
Ferrous Debris Monitor uses magnetometry to measure the wear metal particle contamination of an oil or grease sample and provides trendable parts per million (PPM) results, regardless of the size of the particles. Because its results are provided in PPM, FDM is regarded as an advanced PQ test. The latter indeed only shows them as a unitless index. FDM can be used to measure un-combined ferrous wear metal particle debris in oil or grease in a wide range of types of industrial and marine machinery.
Particle Quantifier Index - Manufacturer (Code: PQ)
The particle quantifier index test measures the mass of ferrous wear debris in a sample and displays this as PQ index by Hall Effect regardless the particle size. PQ index is a unitless quantitative number and can be trended with acceptable linearity over a wide range of ferrous debris content and particle sizes. The larger the index the greater the ferrous wear content.