OIL, GREASE & LUBRICANT

Oils, greases or lubricants for vacuum pumps must meet high requirements. The vapor pressure must be low even at higher temperatures, the water content and water absorption must be minimal. They must have a stable viscosity, have excellent lubricating properties and be resistant to cracking due to increased mechanical load.

Click to see the latest brochure from Leybold on oils, greases and lubricants.

Mineral oils

Mineral oils are products distilled and refined from crude oil. The manner in which the mineral oil is pretreated and its composition are decisive for the uses for which it will be suitable. Depending on the distribution of the hydrocarbons and the dominance of certain properties, mineral oils are grouped by paraffin base, naphthenic and aromatic.

To achieve particularly low ultimate pressures, mineral oil must be selected on the basis of a core fraction. The thermal and chemical resistance of mineral oils has been shown to be sufficient in most applications. They offer a high degree of compatibility with elastomers and resistance to hydrolysis.

Mineral oils also include the group of 'hydrocracked' oils. These are often also referred to as semi-synthetic oils. Hydrocracked oils are produced under a very high hydrogen pressure at high temperature and are largely free of aromatic compounds and olefins. Hydrocracking oils exhibit a higher thermal stability compared to conventional mineral oils. In most cases, the intervals between oil changes can be extended.

Mineral oils include: LVO 100, 120, 130, 140, 150 og 170

You will always be able to get the oil you're in need of, when shopping with us, as we're always stock-bearing a wide selection of different types of oils in different sizes (1 litre, 5 litres etc.)

 

Synthetic oils

Synthetic oils are produced through chemical reactions. The group of synthetic oils includes liquids that differ greatly in their chemical structure and composition. Similarly, their physical and chemical properties differ significantly. Synthetic oils are used in cases where special properties of the oil are required which cannot be met by mineral oils.

PAO oils

Polyalphaolefin oils are synthetic hydrocarbons that are paraffin-like but have a uniform structure. Thermal and chemical resistance are better compared to mineral oils. Due to their good liquid properties, when cold, they can be used at low temperatures. Elastomer compatibility and resistance to hydrolysis can be compared to that of mineral oils.

PAO oils include: LVO 300, 310, 320 og 330

You will always be able to get the oil you're in need of, when shopping with us, as we're always stock-bearing a wide selection of different types of oils in different sizes (1 litre, 5 litres etc.)

Ester oils

Ester oils are organic compounds which are especially distinguished by their high thermal resistance to cracking compared to mineral oils. Chemical resistance is generally quite good, but depends on the type of ester oil. Elastomer compatibility and resistance to hydrolysis are not so good compared to that of mineral oils. They should not be used for pumping acids, halogens or alkaline media such as ammonia in connection with moisture.

Ester oils include: LVO 210, 220, 240, 250 og 260

You will always be able to get the oil you're in need of, when shopping with us, as we're always stock-bearing a wide selection of different types of oils in different sizes (1 litre, 5 litres etc.)

PFPE oils

These are oils are composed of carbon (C), fluorine (F) and oxygen (O) atoms. The existing C-O and C-F bonds are very stable. For this reason, PFPE oils are virtually inactive in terms of exposure to chemical and oxidizing elements.

Perfluoropolyethers do not polymerize under the influence of high energy radiation. Perfluoropolyethers are used in the pumping of highly oxidative substances such as oxygen, ozone or nitrogen oxides as well as highly reactive substances such as halogens and hydrogen halides.

With respect to Lewis acids (e.g. boron trifluoride BF3, aluminum trichloride AlCl3) they are not completely inactive. Here, reactions can take place at temperatures above approx. 150 ° C (302 ° F). Perfluoropolyethers are thermally very stable. PFPE is not flammable. Thermal decomposition should only take place at temperatures above 290 ° C (554 ° F).

PFPE oils include: LVO 400, 410 og 420

You will always be able to get the oil you're in need of, when shopping with us, as we're always stock-bearing a wide selection of different types of oils in different sizes (1 litre, 5 litres etc.)

Oils for diffusion pumps

Pump fluids for oil diffusion pumps must exhibit a low vapor pressure at room temperature and must be highly capable of withstanding thermal decomposition and oxidation. Applicable to the surface tension of the liquid used as the liquid of the pump is that it must be high to reduce creep of oil film. They must be chemically inactive, exhibit a high flash point, and the heat of vaporization must be low.

In addition, the pump fluids must allow high pump speeds over a wide pressure range and be cost effective. One type of pump fluid alone cannot meet these comprehensive requirements. It is therefore necessary to select a pump fluid according to the operating pressure and the requirements of the application in each individual case.

Oils for diffusion pumps include: LVO 500, 521 og 540

You will always be able to get the oil you're in need of, when shopping with us, as we're always stock-bearing a wide selection of different types of oils in different sizes (1 litre, 5 litres etc.)

How often should you change the oil?

Lubricants cannot be used indefinitely as they age over time and their quality deteriorates. Aging is due to, among other things, high temperatures, oxidation, chemical and physical reaction with means of production. All this can, for example, lead to the formation of sludge, resin, crystallization and acids.

An oil change within the planned service intervals is important for the durability of your vacuum pump. The length of the oil change intervals varies depending on the choice of oil. Synthetic oils with special additives, for example, are more resistant than mineral oils.

Important knowledge in relation to the life of your oil

The durability of your oil depends on many parameters. An important factor is the temperature. Mineral oils usually have a maximum temperature limit of 80 ° C. Above this temperature it can be said in a very simplified way that a temperature rise of 10 ° C leads to a reduction in oil life by 50%. This results in a thickening of the oil.

Synthetic oils can be operated permanently at 100 to 160 ° C depending on the type.

PFPE oils up to a maximum of 250 ° C permanent temperature, lower maximum temperatures must be observed depending on the process medium. PFPE oils are not subject to typical oil aging as they are virtually inactive.

On the other hand, if a pump is used too cold, water vapor or other vapors can condense. Condensed liquid can cause loss of lubrication properties or corrosion in the pump.

Contact our advisor for further information

Steen Rasmussen, District manager, Vacuum

  4320 2687   |      3017 7861   |      sra@granzow.dk

 

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