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Collective term for fluid and gaseous media. Here fluids is above all a common term for hydraulic fluids and compressed air.

Fire-resistant fluids based on a solution of polymers (polyglycols) in water at a ratio of around 60:40. HFC pressure fluids have a viscosity of 30 to 45 mm2/s at 50°C and may be used instead of mineral [...] Sole restriction: roller bearings have a shorter lifetime given the water content of HFC pressure fluids and the working temperature is limited to a range between –20°C and +60°C. The water content must

Fire-resistant fluids based on "water in oil", i.e. an emulsion of around 40% water in mineral oil. Not used in Germany (although they are in the UK, for example).

Biodegradable fluids are hydraulic fluids that biodegrade significantly more quickly than mineral oils. Biodegradation is a chemical conversion caused by microorganisms under aerobic conditions in an

In order for the hydraulic fluid to deliver sufficient lubricating effect in plain bearings and under seals , it must have sufficient wetting ability. This is generally the case with HLPD oils .

creates sludge or resin-like coatings on device parts as ageing products. The ageing of hydraulic fluids is accelerated by air (oxygen), water, high temperatures and metal catalysts. It is measured by the

readily biodegradable hydraulic fluids are used. These fluids can be produced from mineral oil or using renewable materials. They are also referred to as bio-based hydraulic fluids. [...] Hydraulic fluids have the task of transporting hydraulic energy from the location of generation (pump) to the location of conversion ( cylinder , motor) with the minimum possible losses. They are also [...] contamination, which is caused by debris, for example. For this task, mineral oils and flame-resistant fluids are available. In addition, in environments that are critical for biology (construction machines

Water-free, synthetically produced fire-resistant fluids. They rely on the following compounds: Phosphoric ester (HFD R), currently the most widely used HFD fluid; performs worst in terms of fire resistance [...] environmental protection. Mixtures of HFD R and HFD S. Other compositions (HFD U). Common to All HFD fluids is the lack of compatibility with most materials for seals and a high density of 1.15 to 1.4 g/cm3

flame-resistant hydraulic fluids is comprised of water-bearing emulsions ( HFA and HFB fluids ) of aqueous solutions ( HFC pressure fluids ) and water-free, synthetic fluids in the HFD group . With the [...] is water-thin ( Table S 1 ). In most cases, the HFA pressure fluids (DIN 24 320) require a special structure, while HFC and HFD pressure fluids can be used to operate all construction elements in hydraulic

Compressibility