The three qualities used when specifying a grease are: type of soap, hardness, and ______.

• A. Dropping point
• B. Viscosity
• C. Color
• D. Density

Answer: (A)

When selecting grease, three factors matter: the type of soap (thickener) used, how hard or soft the grease is (its consistency, often an NLGI grade), and how it performs at elevated temperatures. The third factor is the dropping point, which is the temperature at which the grease begins to soften and the oil begins to separate from the thickener. This gives a clear measure of high-temperature capability and reliability in service.

Among the options, dropping point best fits, because it directly indicates temperature performance. Color and density aren’t used to define grease for specifications, and viscosity relates to the base oil but isn’t the standard third qualifier alongside thickener type and hardness.