Greases
for long-term lubrication under critical operation conditions
Greases consist of a base oil that is bound by a thickener (soap). The lubricant thus remains at the lubricating point, where it ensures continued effective protection against friction and wear and seals the lubricating point against external influences such as humidity and foreign matter. Greases are often used at roller and friction bearings, spindles, fittings, seals, guides but also at chains and gears.

 

Characteristics Standard Description
Base oil viscosity DIN 51561 Influences speed range and load-bearing capacity of a grease
Drop point DIN ISO 2176

If this temperature is exceeded, the grease structure is destroyed

Operating temperature DIN 51805
DIN 51821/2
(roller bearings)
Temperature range of the optimal performance

Speed characteristic data
(
DN factor)

 

 

Maximum rotational speed up to which a grease can be used in a roller bearing

Consistency DIN ISO 2137

Measure for the consistency of a grease

NLGI grade DIN 51818

Classification into consistency classes

Four-ball test DIN 51350

Determining of the wear protection and of the maximum
load‑bearing capacity of a grease

 

The main difference in the structure of greases compared to oil is the thickener that determines the typical characteristics of a grease.

 

Thickener
(soap)

Operating
temperature[°C]
Mineral oil

Operating
temperature [°C]
Synthetic oil

Drop point
[°C]

Water
resistance
Load-bearing capacity
 Calcium -30 -> +50          not applicable  <100

++

 Lithium -35 -> +120 -60 -> +160  170/200

+

-

 Al-Complex -30 -> +140 -60 -> +160  >230

+

-

 Ba-Complex -25 -> +140 -60 -> +160  >220

++

++ 

 Ca-Complex -30 -> +140 -60 -> +160  >190

++

++

 Li-Complex -40 -> +140 -60 -> +160 >220

+

-

 Bentonite -40 -> +140 -60 -> +180  without

+

-

 Polycarbamide -30 -> +160 -40 -> +160  250

+

-

 

In addition to the miscibility of the base oils, the compatibility of the thickeners must also be taken into consideration.