Coolant water treatment

Coolant water treatmentan important stage and one of the main indicators of the further work of this very liquid.


Why can the composition of water affect the stability of a metalworking solution?

It is known that the working coolant solution is 95-97% water, therefore its quality and hardness fundamentally affect the durability and uninterrupted operation of the operation of the process fluid. Therefore, it is necessary to take the analysis of water for the preparation of coolant with full responsibility.

Tap drinking water is the best option for preparing a working coolant solution. This is due to the fact that the indicators of tap water comply with the normative standards GOST 2874-82 and GSanPiN 2.2.4-171-10.

The requirements are clearly stated in these documents:

  1. Toward the epidemiological safety of water (microbiological indicators)
  2. Sanitary and chemical safety indicators (odor, pH, hardness, alkalinity, metals, metal salts, etc.)< /span>
  3. Indicators of specific alpha and beta activity
  4. Permissible radiation parameters
  5. Mineral composition of water and general hardness.

If you decide to use water from a well, a well, and similar sources, it is highly likely that such water may contain an increased content of bacteria, chlorine , metal salts and do not meet the average hardness. It is not difficult to guess what the use of such water for the preparation of a working solution of a cutting fluid will lead to. Namely:

  • quick bacterial contamination
  • instability
  • corrosion
  • high foam
  • emulsion layering, etc.

Unfortunately, coolant prepared in this way can cause problems after a week of use. With a high probability, it will be necessary to replace the composition and wash the equipment. So why complicate your life if you can just use high-quality water.

Water treatment for coolants other than tap water also allows the use of distilled or demineralized water. This will also increase the life and quality of the working coolant solution.

Basic water composition requirements can be summarized in the following table:


Table 1. Main indicators of water quality for cutting fluids

Indicator Unit measurements Max value Min value
pH 8 5
Rigidity mg eq/l 8 1.5-2
Defeat points ≥ 4
Nitrates mg/L ≥50
Nitrite ≥20
Sulfates ≥100
Chlorides ≥100
Mechanical water purity g/l ≥0.1

In order to understand whether your water meets these indicators, you need to analyze it. If the indicators differ from the norm, there is always the opportunity to correct them.
For example, water hardness can be corrected with Trilon B reagent, and salt concentration can also be reduced by simply diluting the solution with distilled or demineralized water. Indicators of bacterial activity in water will help to determine the immersion slide method and correct by adding a biocide. And water with sediment, rust, turbidity, suspensions, etc. pollution must be subjected to mandatory filtration. After all, such contamination in the future can lead to system failures in general, as well as to corrosion or bacterial contamination.

IMPORTANT! In connection with the above, important not only choose the right coolant, but also use analyzed water to mix it, which will meet all of the above requirements.
Novochem Company’s product range includes coolants that can work perfectly on water of any hardness, for example, Defender-Pro or Defender-Standard, as well as cutting fluids, which initially have increased bacterial protection.

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Call our technical consultants and we will select the coolant that will meet your individual requirements!