Industrial lubricants > Greases for bearings

  GREASES

Grease Composition :

70 to 95 % are base oil (mineral, synthetic or vegetable oils). The base oil acts as the lubricant.

3 to 20 % represents thickener (simple soaps, complex soaps etc.) to give the lubricant its consistency (semi-fluid, fluid, soft or tough lubricants) and trapping the base oil and additives in a sort of net using a physical and chemical reaction so that the lubricant will not flow.

0 to 10 % are additives (rust prevention, extreme pressure and other additives) to provide the lubricant with special properties.

These greases stand out due to their adhesion to the surfaces to be lubricated, the fact they are insoluble in water, their stress resistance, and their long service life. As a general rule, a grease may not exceed 300°C (the temperature at which the base oil separates from the thickener or soap). Above 300°C, pastes or varnishes with an aluminium or copper base are to be used.

The role of a grease is to :

1/ Reduce wear on mechanical parts subject to friction.

2/ Create a watertight barrier against external elements (dust, water, solvents, heat, etc.).

3/ Constitute a lubricant reserve that is constantly available.

4/ Reduce heat and energy losses due to friction.
1. Multi-purpose greases : These are applied both to roller bearings and mechanical equipment, or to bearings. Their characteristics vary, thus enabling lubrication that matches your needs.

2. High-temperature greases : These are resistant to very high temperatures, (over 300°C in some cases), and allow you to lubricate mechanisms operating in severe conditions, roller bearings, rolling mill bearings, and trolley axles and shafts.

3. Silicon greases : A distinction is drawn between grease for special lubrication which resists oxidisation and ageing; and grease for valves and fittings.

4. Centralised greasing : Molydal offers greases specially formulated for centralised greasing. The advantages of centralised greasing are as follows: greasing at regular intervals, and accurate grease quantity.

5. Special greases : For Low and high-temperature. Greases that are resistant to hydrocarbons, special oxygen grease, and high-speed grease.

6. Food Grade Grease : Greases specially designed for incidental contact with food products. These lubricants comply with the NSF (National Sanitation Foundation).