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Contaminants in Coolant

Our Newsletter

Contaminants in Coolant

Unfiltered Machine Coolant can have a lot of particles, bacteria and other contaminants in it.  Coming up with a Machine Coolant management  Plan witll reduce these contaminants and increase the Machine Coolant Life. 

Synthetic machine coolants

1.  Water: hardness ions (chlorides, and sulfates) - Minimal to no effect on solution but can help create tacky residues and increase rust potential

2.  Lubrication oils (tramp oils) - Should readily split from solution

3.  Chips, fine abrasives (swarf) - Can be readily separated by filtering, settling, magnets, centrifuges, etc.

4.  Organic matter biological agents from various sources - Usually most components are not attractive food sources and higher alkalinity tends to decrease bioagents' capacity to thrive

5.  Fluids from previous operations - Water dilutable products will mix; oil products will tend to split

Semisynthetic machine coolants

1.  Water: hardness ions (chlorides, and sulfates) - Moderate influence on the emulsion and creation of tacky residues and rust potential

2.  Lubrication oils (tramp oils) - Some splitting and some absorption into coolant promotes bacterial activity

3.  Chips, fine abrasives (swarf) - Can be separated by filtering, settling, magnets, centrifuges; very fine swarf can attach to oil particles

4.  Organic matter biological agents from various sources - Oil, emulsifiers, fatty substances can be good food sources; alkalinity tends to discourage growth of bioagents

5.  Fluids from previous operations - Water dilutable products will mix, oil products will tend to split, but some may emulsify

Soluble oil machine coolants

1.  Water: hardness ions (chlorides, and sulfates) - Strong negative influence in destabilizing emulsion and increasing rust potential

2.  Lubrication oils (tramp oils) - Little splitting and heavy absorption into coolant can replace coolant's oil, strongly destabilize emulsions and bacterial activity

3.  Chips, fine abrasives (swarf) - Can be separated by filtering, settling, magnets, centrifuges; small particles can attach to oil particles

4.  Organic matter biological agents from various sources - Oil, emulsifiers, fatty substances can be excellent food sources; bacteria lowers pH and tends to destabilize emulsion and promotes rust

5.   Fluids from previous operations - Water dilutable products will mix, oil products will tend to emulsify with some splitting 

Notes:

  • Water: hardness ions (chlorides, and sulfates) - Water evaporation increases problem; using deionized or distilled water may be necessary

  • Lubrication oils (tramp oils) - Prevent oil entering coolant and remove by filtering, skimming, coalescing, centrifuging as necessary

  • Chips, fine abrasives (swarf) - The finer the particles and the looser the emulsion, the more likely that metal removal becomes more difficult

  • Organic matter biological agents from various sources - Biocides, fungicides and alkalinity boosters may have to be added into the coolants, raising costs and dermatitis potential

  • Fluids from previous operations - Fluid entering coolants should be analyzed and coordinated to minimize negative results


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