greases

Whenever oil lubrication is not possible or a cooling function is not required, a lubricating grease is used. Greases are composed of a base oil that is bound by a thickener (soap). This property ensures that the lubricant is kept at the lubricating area. The lubricating area is permanently protected against friction and wear as well as against external influences such as moisture and foreign matter. Grease is commonly used to lubricate bearings, spindles, fittings, seals, guides, as well as chains and gears.

Characteristics of greases:

• Base oil viscosity - Influences the speed range and load capacity of grease. Low viscosity for low pressure stress and high sliding speeds, high viscosity for high pressure stress, low sliding speeds and high temperatures.
• Drop point - Exceeding this temperature results in destruction of the grease structure.
• Operating temperature - Temperature range of the optimal performance.
• Speed parameter (DN value) - Maximum rotating speed up to which grease can be used in a roller bearing.
• NLGI grade - Classification to the consistency classes to DIN ISO 2137. The classification according to NLGI (DIN 51818) ranges from very soft (Class 000) to very hard (Class 6).
• Four-ball test - Determining of the wear protection and of the maximum load capacity of a roller bearing grease.