How to reduce FOAMING COOLANT? / Taiwan-Based Metalworking Fluid Manufacturer & Supplier For 39 Years | HLJH

Foaming Issue / HAI LU JYA HE Co., Ltd. (HLJH) have been focusing on manufacturing and marketing the industrial lubricants more than 30 years. Our fundamental belief is to make a harmful, friendly with lives, businesses, and leaving a lasting legacy for generations to come. We offer metalworking fluids (water-based cutting fluid, neat cutting oil), rust preventive oil, hydraulic oil, slideway oil, spindle oil, gear oil and so on that cover the whole industrial lubricant value chain.

How to reduce FOAMING COOLANT?

Are you frustrated by coolant foaming in your CNC machining? Don't let it hinder your operations. At Hai Lu Jya He, we understand the impact of coolant issues on efficiency and quality. Our expertise in metalworking fluids ensures optimal coolant performance, crucial for smooth operations.


Foaming in metalworking fluids is a common issue that can disrupt operations. Understanding its causes and implementing preventive measures is crucial for seamless processing. Excessive foam, often caused by chemical or mechanical factors, can hinder performance and lead to inefficiencies.

To address foaming, it's essential to maintain the correct dilution ratio of lubricant and water in cutting oils. Excessive lubricant can exacerbate foaming, so adjusting the ratio by reducing lubricant and increasing water content can help mitigate the issue. Conversely, insufficient lubricant may cause pump cavitation, leading to foaming. Increasing lubricant levels in the pump can resolve this problem.

a. Check Coolant Tank

If the tank level gets too low the pump will thrash the coolant and essentially "spray foam", and many times the cause for excessive foam. Obviously, if the chip tray gets too full and the coolant is foamy it will overflow the coolant tank. Another, high pressure and agitation, "waterfalls", high flows and high discharge pressure may cause unnecessary movement of the liquid. This can usually be improved with a relatively simple redesigning of the system.

b. Clean Coolant Tank Regularly

Foam is especially common in smaller sumps, where all changes happen faster. Therefore, the particles and swarf (such as turnings, filings, chips, or shavings) cannot be allowed to accumulate at the coolant tank because it may hamper access to the machine, and cause foam easily. Therefore, cleaning machines regularly will be necessary.

c. Check Temperature

A high temperature may lead to foam in some synthetic fluids Temperature, primarily because of its effect on viscosity which may promote foaming. It is also an important factor in foam stability.

d. Soft Water Increases Foaming

If the water that you use for production is too soft (below 8° dH/140 ppm) for the metalworking fluid, there will be a lot of foam when a system is newly filled. It can greatly increase foaming. In most cases, normal tap water can be used for the initial filling of the machine, while treated water is recommended for the preparation of the top-up emulsion.

e. Check Your Coolant

Foaming occurs in your CNC's coolant because of entrained air by mechanical or chemical processes, and the degree of agitation in the system. You can get rid of foam in a coolant tank temporarily by adding defoamers, but some defoamers help to emulsify leak oil, which is food for bacteria.

If these problems cannot be handled by adjustments, then contact your cutting oil’s sales for recommended antifoam that will help to control the foaming problem. Add antifoams at the lowest recommended dosage. Too much is not always better. Almost invariably antifoams will be filtered out of the coolant or they will be carried out on chips and parts. Please feel free to contact us if you have any concerns and needs.

MORESCO BS-66 water soluble cutting oil stands out for its outstanding anti-foaming characteristics. This unique attribute ensures uninterrupted and stable performance, particularly in high-pressure machining operations. The oil's remarkable ability to mitigate foam formation contributes significantly to sustained efficiency, preventing disruptions and ensuring consistent machining precision.


Comprehensive documentation, including Safety Data Sheets (SDS), Technical Data Sheets (TDS), REACH, and RoHS information for MORESCO BS-66 water soluble cutting oil, is conveniently accessible upon request through the "Files Download" feature. MORESCO BS-66 water soluble cutting oil


"Reference for Differences Before and After Use"

When encountering foaming issues, many people opt to directly purchase defoaming agents due to time and cost considerations. Although these agents provide quick and effective results, they offer only temporary relief. In the long run, they fail to address the root cause of foaming. Conducting initial tests and assessments using the aforementioned methods can effectively reduce the likelihood of foaming during cutting processes.

Adjusting the proportion of oil additives should primarily follow the recommendations of the cutting oil manufacturer. If defoaming agents are needed, please feel free to contact us via Email or send an inquiry. We will strive to assist you promptly.


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How to reduce FOAMING COOLANT? | Eco-Friendly, Harmless & Low Pollution Industrial Lubricants Manufacturer And Supplier Since 1982 | HLJH

Located in Taiwan, HAI LU JYA HE CO., LTD has been an industrial lubricant manufacturer and supplier. Main products, include metalworking fluids, industrial lubricants, soluble cutting oils, semi-synthetic cutting oils, synthetic cutting fluids, neat cutting oils, rust preventive oils, slideway oils and hydraulic oils, which can reach 150 tons of cutting fluids per month.

HAI LU JYA HE Co., Ltd. (HLJH) have been focusing on manufacturing and marketing the industrial lubricants more than 30 years. Our fundamental belief is to make a harmful, friendly with lives, businesses, and leaving a lasting legacy for generations to come. We offer metalworking fluids (water-based cutting fluid, neat cutting oil), rust preventive oil, hydraulic oil, slideway oil, spindle oil, gear oil and so on that cover the whole industrial lubricant value chain. Our fundamental belief is to offer harmful and friendly products such as water-based cutting oils, neat cutting oil, rust preventive oil, hydraulic oil, slideway oil, spindle oil, gear oil and so on that cover the whole industrial lubricant value chain.

HLJH has been offering customers high-quality metalworking oils and fluids, both with advanced technology and 39 years of experience, HLJH ensures each customer's demands are met.