The Best wheel bearing grease for South Africa
W/BEARING GREASEV 500ML
Wheel Bearing Grease
Grease was probably the first lubricant ever used. Animal fats were thought to have been used by the ancient Egyptians to lubricate the hubs of the wooden wheels of their chariots. That was some time ago. Those early forms of grease, based on animal fats, were able to handle smaller loads and the slower speeds of those earlier times. The basic nature of a grease hasn’t changed much since that time. However, animal fats would not be capable of meeting the demands of today’s automotive and industrial requirements. High loads, high speeds and high temperatures, along with other special requirements, all place much higher demands on the most recent greases.
That said, grease is still made up of an oil thickened, usually by what is called a soap. For those incredible chemists out there, soap-based thickeners are produced from an acid base reaction. The acid is a fatty, along with (in a few cases) a short-chain organic complexing acid. Saponification, therefore, is the process used to produce a soap based thickener as follows: Acid + Base = Soap + Water
Grease is a solid or semi-solid lubricant,that starts out as a liquid lubricant (in other words – oil or another liquid) to which a thickening agent is added, usually a soap (like lithium). Most multipurpose/extreme pressure (EP) greases are lithium (soap) based and contain an SAE 90 viscosity oil, like gear oil.
Greases are affected by viscosity, temperature and oxidation resistance, just as oils are. All greases are made up of different components, including the base oil type, base oil viscosity and thickener type.
Oil itself is the basic lubricant, and is the most important component because it has a huge influence on the behaviour of the grease. The amount of oil included in a grease may be anywhere from 70% – 95%. The oil content of a grease can be any of a wide variety of oils including mineral (paraffinic & naphthenic), natural (vegetable oils), high performance (silicones & fluorinated fluids) and synthetic (PAO, Ester, PAG & Alkylbenzenes). The base oil type is determined by the operating conditions under which the grease will be expected to perform. These include high and/or low temperatures, loads and pressures. The load and pressure will not only influence the choice of base oil type but also the additive package which can comprise up to 10% of the grease.