Appearance: visual inspection method only sees grease features, often including overall appearance, texture, color and gloss.
Overall appearance: smooth, rough, granular, sub-oil and so on.
Texture: creamy, elastic, wire drawing.
Color: red, blue, yellow, white, etc., can also be coupled with restrictions adjective "light" "Medium" "deep" and so on.
Luster: bright, dull and so on.
Consistency: Consistency is the plastic material to resist deformation under the external force level.
Penetration: Penetration is a measure of grease consistency. Penetration bigger, softer fat.
Consistency class: NLGI (American Association of grease) is divided into nine levels, from 000-6 nine.
Mechanical stability: resistance to grease consistency when subjected to mechanical shear ability to change, change the value of consistency the smaller the better mechanical stability.: Grease by shear, the consistency smaller, stop cut, the consistency and the nature of the increase.
Water resistance: resistance to grease washed away from the bearing capacity, resistance to grease due to absorption of water leaving the ability of structural damage in the presence of water to prevent metal surface corrosion.
Colloidal stability: the ability of oil grease resistance points.
Similar to the viscosity: the viscosity of grease is usually cut with smaller speed increases, so therein viscosity as viscosity or apparent viscosity similar.