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The consistency of a grease impacts its hardness (plasticity). The consistency classification spans the NLGI classes 000 (very soft, almost fluid) to 6 (solid). NLGI stands for National Lubricating Grease Institute, an American institution whose work focuses on technical requirements for greases.
The higher the penetration depth of the test cone, the higher the penetration value, and, accordingly, the softer the lubricating grease and the lower the consistency class in accordance with NLGI.