Checklist for water-based hydraulic fluids

Technical explanation

The scope of ISO 1436 distinguishes between defined oil-based and water-based fluid classes; it also states that compatibility must be determined by the user and the manufacturer. This distinction shows that a statement of conformity to a standard does not cover all commercial hydraulic fluids. The additive package, mixing ratio and service condition matter. In addition to the hose inner tube, the seal, connection metal and cleaning agent are also within the scope of selection.

Source: S020, S062

Topic-specific checkpoints

Source: S020, S062

How is it assessed in practice?

Attach the trade name of the fluid, its technical/safety document and the mixing ratio used to the quotation request. If the machine is to be switched to another fluid, do not automatically keep the old hose stock code. First open a compatibility record with the new fluid and ask the manufacturer for a response for a defined product code. For example, the phrase 'fire-resistant hydraulic fluid' alone is not enough to select the actual composition or the hose inner tube. In a conversion project, cleaning and residue of the previous fluid should also be included in the file.

Original editorial recommendation; not a clause of a standard.

Frequently asked questions

If its standard mentions water-based fluid, is that enough for every water-glycol mixture?

No. The relevant fluid class and the actual product conditions must be matched. The general scope of the standard does not replace manufacturer approval for a mixture whose name is unknown.

Source: S020, S062