Hydraulic oils with the designation HLP 32 are used as pressure fluids in industrial and mobile applications. They absorb high pressure (over 200 bar), protect against wear and thus prevent premature material ageing.

The designation HLP 32 is based on the letter combination "HLP" and "32". HLP are the code letters of the hydraulic fluid, which are defined in DIN 51524-2. These are hydraulic oils with anti-ageing and anti-corrosion additives as well as active agents for reducing friction and wear. The number 32 is due to the kinematic viscosity of the hydraulic oil (in mm²/s) at 40 °C. The respective viscosity classes were specified in the ISO VG.

Our HLP 32 hydraulic oils


Specifications / Approvals:

DIN 51524-2 (HLP), DIN 51519, ISO 3448, DIN EN ISO 6743-4 (HM)

meets the requirements:


Specifications / Approvals:

NSF H1, DIN 51524-3 (HVLP), DIN 51524-2 (HLP), DIN 51517-3 (CLP), DIN 51506 (VDL), Kosher, Halal


Specifications / Approvals:

NSF H1, DIN 51524-3 (HVLP), DIN 51524-2 (HLP), Kosher, Halal

HLP 32 viscosity

The viscosity of HLP 32 refers to the defined viscosity class of ISO VG (International Organization for Standardization Viscosity Grade). This describes that the kinematic viscosity of the hydraulic oil at 40 °C must be between 28.8 and 35.2 mm²/s. The average viscosity in this case is 32 mm²/s. Oils with ISO VG 32 are regarded as comparatively low viscosity. The ISO VG classes range from 2 (very thin) to 1500 (high viscous).

What is the difference between HLP 32 and HLP 46?

Hydraulic oils of class HLP 32 have a lower viscosity than oils of class HLP 46. This is due to the ISO VG classes to which the oils belong. While the centre point viscosity of HLP 32 is 32 mm²/s, it is 46 mm²/s for HLP 46. The higher the value, the more viscous the oil becomes.

In addition, oils with HLP 32 usually have a better pour point than HLP 46 and are therefore more flowable at low temperatures. On the other hand, the oils with HLP 46 have a higher flash point and are therefore more stable at higher temperatures than HLP 32.

It depends on the application and the manufacturer's specifications, whether HLP 32 or HLP 46 must be filled into your system. If you are unsure which hydraulic oil to use, our application technology experts will be happy to help you.

Can HLP 32 and HLP 46 oils be mixed?

In principle, hydraulic oils of classes HLP 32 and HLP 46 can be mixed with each other. However, we do not recommend mixing, as this can also change the basic properties of the oils such as resistance to cold or heat and viscosity unpredictably depending on the mixing ratio. If the blended oils no longer match the manufacturer's specifications for your hydraulics, increased wear may occur or, in the worst case, the system may fail. Always fill only the oil of one class into your system and, if in doubt, change the oil completely instead of adding unsuitable hydraulic oil.


Hans-Jürgen Scholz

Product Manager Industry Lubricants