Commonly Used Medias For Hydraulic Systems
2.0. COMMONLY USED MEDIAS FOR HYDRAULIC SYSTEMS
These oils, which comply with the DIN 51524 standards, are commonly used in hydraulic systems. There are 5 different categories.
| DIN 51524 MINERAL OILS | |||||
| MEDIA | STANDARD | SPECIFICATIONS | APPLICATION AREA | INTERNATIONAL TERMINOLOGY | |
| H-L Type Oils | DIN-E 51524 part 1 | Contains oxidisation retardant and rustproofing agent. | General Usage | HL | |
| H-LP Type Oils | DIN-E 51524 part 2 | H-L Type oils are added to prevent abrasion. | High Pressure Systems | HM | |
| H-V Type Oils | DIN-E 51524 part 3 | H-LP Type oils are added as a heat regulating agent. | Various Temperature Systems | HV | |
| H-LPD Type Oils | H-LP Type oils contain only a limited amount of detergent and water. | Processes in which water is used -Prevents the build up of deposits |
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| H-D Motor Oils | API-CC API-CD API-SE |
Oxidisation and rustproofing agent which reduces abrasion. | Mobile Hydraulic Systems | ||
However, it may not always be possible to use mineral oils in hydraulic systems. It is important to consider the type of media being used when choosing the appropriate seals.
The table below shows commonly used media types and the areas in which they are used.
| MATERIAL | Imflammable Hydraulic oils - VDMA 24317 or DIN 24320 standards | |||
| HFA | HFB | HFC | HFD | |
| 70 NBR | 55 | 60 | 60 | |
| 80 NBR | 55 | 60 | 60 | |
| 90 NBR | 55 | 60 | 60 | |
| 70 FKM | 55 | 60 | 60 | 150 |
| 80 FKM | 55 | 60 | 60 | 150 |
| 90 FKM | 55 | 60 | 60 | 150 |
| 80 PU | 40 | 40 | 40 | |
| 90 PU | 40 | 40 | 40 | |
| PTFE | ||||
| TPE | 40 | 40 | 40 | |
| POM | 55 | 60 | 60 | 80 |
However, it may not always be possible to use mineral oils in hydraulic systems. It is important to consider the type of media being used when choosing the appropriate seals.
The table below shows commonly used media types and the areas in which they are used.
| MATERIAL | Imflammable Hydraulic oils - VDMA 24317 or DIN 24320 standards | |||
| HFA | HFB | HFC | HFD | |
| 70 NBR | 55 | 60 | 60 | |
| 80 NBR | 55 | 60 | 60 | |
| 90 NBR | 55 | 60 | 60 | |
| 70 FKM | 55 | 60 | 60 | 150 |
| 80 FKM | 55 | 60 | 60 | 150 |
| 90 FKM | 55 | 60 | 60 | 150 |
| 80 PU | 40 | 40 | 40 | |
| 90 PU | 40 | 40 | 40 | |
| PTFE | ||||
| TPE | 40 | 40 | 40 | |
| POM | 55 | 60 | 60 | 80 |