2015.09.06 Maintenance

Choose the correct metalworking fluid for your water

When choosing metalworking fluid, you should first find out what kind of water you have. If the MWF is not compatible with the water used, problems like foam can arise.

The quality of the water is very important in view of the fact that water constitutes over 90% of the metalworking fluid. Urban water is often first-rate, with a uniform quality, nevertheless, problems can arise.


Over time, the salts that are present in the water, for example, chlorides and lime, can cause rust and deposits in the system. Even though the water evaporates, the salts remain and are thus concentrated in the system.

Rule of thumb: Never have > 100 ppm chlorides in the metalworking fluid!

A de-ionizing plant can be a good investment if you have major problems with salts. It is used for top-up.


The water's properties affect the choice of metalworking fluid. If the metalworking fluid is not compatible with the water that is used, it can result in, for example, formation of foam in the metalworking fluid.

One of these properties is the water's hardness, which varies depending on where in the world the production is located. For example, the water is soft in Sweden while it is hard in Germany.


Read more about process fluids in our e-book.

E-book: UV light

Jan Östlund
Jan Östlund

Jan har över 20 års erfarenhet av processvätskor inom den metallbearbetande industrin. Han har stor kunskap om processvätskans kritiska funktion och även om dess miljörisker.

Jan has over 20 years' of experience from process fluids within the metalworking industry. He is highly knowledgeable on the process fluid's critical functions and its environmental impact as well as the total cost of ownership related to process fluids and the savings that can be achieved making the right choices.

Jan hat über 20 Jahre Erfahrung mit Prozessflüssigkeiten in der Metallverarbeitenden Industrie. Er ist sehr gut informiert sowohl über die kritische Funktion der Prozessflüssigkeit als auch über seine Umweltrisiken.

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