Spark Erosion Dielectric Fluid


Spark Erosion Dielectric Fluid for electrical discharge machining (EDM), sometimes colloquially also referred to as spark machining, spark eroding, burning, die sinking, odourless kerosene..etc

SKU: DF Categories: ,


Spark Erosion Dielectric Fluid is a light viscosity hydrocarbon, of low aromatic content and odour.


Electrical discharge machining (EDM). Sometimes also referred to as spark machining, spark eroding, burning, die sinking, wire burning or wire erosion. You can obtain a desired shape by using electrical discharges (sparks). Otherwise known as odourless kerosene.

We advise that if the cutting oil needs changing you dispose of the used fluid and flush through with system cleaner before replacing the fluid.

User Benefits

  • You can perform high quality work with high clarity.
  • Low odour and aromatic content provide good operator acceptability.


The process of spark erosion is simple. Your work piece and tool are placed in position so that they do not touch each other. They are then separated by a gap which is filled with an insulating fluid. The cutting process therefore takes place in a tank. You connect the work piece and tool to a D.C. source. There is a switch in one lead. When this is closed, an electrical potential is applied between the work piece and tool. At first no current flows. This is because the dielectric between the work piece and tool is an insulator. However, if the gap is reduced then a spark jumps across it when it reaches a very small size.

In this process current is changed into heat. Therefore the surface of the material is very strongly heated in the discharge channel. If the flow of current is interrupted the discharge channel collapses very quickly. Consequently the molten metal on the surface of the material evaporates explosively and takes liquid material with it. A small crater is formed. If one discharge is followed by another new craters are formed next to the previous ones and the work piece surface is constantly eroded.

Spark Erosion Dielectric Fluid Background

Material is removed from the work piece using a series of rapid current discharges. The electrodes are separated by a dielectric liquid and subject to an electric voltage. The process depends upon the tool and work piece not making actual contact.

First of all the voltage is increased. The strength of the electric field in the volume between the electrodes becomes greater than the strength of the dielectric. This breaks, allowing current to flow between the two electrodes. This process is the same as the breakdown of a capacitor. As a result, material is removed from both electrodes. Due to this, solid particles are carried away causing the insulating properties of the dielectric to be restored.

If required we also supply neat and soluble cutting oils for other machining needs.

If you have anymore questions please contact our office on 01797 223374 or email


Additional information


20ltrs, 205ltrs


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