8 Reasons your Coolant is Foaming & How to Stop it.

8 reasons your coolant is foaming - & how to stop it

We get a lot of technical calls relating to coolant foaming. There are a number of factors that can cause it, most of which are easy to remedy. Here are the top 8 reasons your coolant may have started to foam:

1, Running coolant at too high % mix – check with a hand refractometer and adjust back in to spec.

2, Low sump levels causing air entrainment – keep fluid levels as full as possible by topping up your coolant little and often.

3, Blocked filters restricting flow to the pump – regularly check and clean any filters in the system.

4, Paper filtration systems “stripping” antifoam from the coolant – use a coolant suited to paper band filtration systems.

5, Coolant not suited to high pressure coolant systems – use a high performance fluid suited to modern TSC systems.

6, Ultra-soft make up water – foam is more likely to occur in very soft water, check the water hardness range of your fluid.

7, Hard water soaps – if you are in a hard water area and your coolant isn’t suited to hard water it may form soaps or start to split which impacts the stability of the emulsion leading to foaming.

8, Heavily contaminated sumps – if you have a 200 ltr sump and 50% of it is compacted swarf then the fluid has insufficient dwell time and foaming may occur – regularly filter the fluid to minimise contamination.

Antifoam additives can help manage the situation but should only be seen as a short term fix and not a long term solution. We have a technical team on hand to troubleshoot any of your coolant problems. If you are experiencing any foaming issues with your coolant then get in touch, as always our help and advice is free.

Email info@penninelubricants.co.uk or call 0114 285 2987

Pennine are more than just a supplier, they offer technical support and expertise. They provide full regular monitoring of metal working fluids and any aspects that support the safe use and operation of the oils and coolants we use on our site. Kevin Martin, Health & Safety Manager, Abbey Forged Products

They offer an excellent service, are polite and offer helpful advice. Mathew Kelly, Operations Manager, Barrett Steel

The communication from Pennine is great, we are always fully informed of our order status and they always deliver on time. I have been really impressed with the quality of their oil. Mark Wood, Fitter, Betney Cop Restoration Co.

We've recently changed to Pennine Lubricants, I can't thank Bob enough for the effort and service that's provided every time we order. Always happy to do business. Mylo Charlesworth, Purchasing and Warehouse Operative, CNC Rotary.com

In fifteen years of dealing with Pennine Lubricants, I have found the service to be impeccable. Jeremy Gosling, Director, Fine Grinding LTD

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