Butter is also called grease. Butter should be changed every six months to prevent rust. Grease can prevent screws from rusting. Butter is also oil, but it is solid after cooling. Oil can isolate air moisture and protect screws.

Function:

Most greases are used for lubrication and are called antifriction greases. Anti-friction grease mainly plays the role of reducing mechanical friction and preventing mechanical wear. At the same time, it also plays a protective role in preventing metal corrosion and sealing dust.

Some greases are mainly used to prevent metal from rusting or corrosion, and are called protective greases. For example, a few greases specially used for sealing, such as industrial butter, are called sealing greases, such as thread compound. Oils and fats are mostly semi-solid substances with unique fluidity.

The working principle of grease is that the thickener keeps the oil in the position that needs lubrication, and when there is a load, the thickener releases the oil, thus playing a lubricating role.

At room temperature and at rest, like a solid, it can keep its shape without flowing and stick to metal without sliding. It can flow like a liquid under the condition of high temperature or external force exceeding a certain limit. When grease is sheared by moving parts in machinery, it can flow and lubricate, reducing friction and wear between moving surfaces.

When the shearing action stops, it can restore a certain consistency, and this special fluidity of oil determines that it can be lubricated at the parts that are not suitable for lubricating oil. In addition, because it is a semi-solid substance, its sealing function and protection function are better than lubricating oil.