Grease is a thick, oily semisolid. It is used in the friction parts of machinery to lubricate and seal. It is also used on metal surfaces to fill gaps and prevent rust. It is mainly made of mineral oil (or synthetic lubricant) and thickener.
The working principle of grease is that the thickener keeps the oil in the position where lubrication is required, and when there is a load, the thickener releases the oil, thereby playing a lubricating role.
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