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USE APPROPRIATE FLUID

Use the appropriate fluid - in sinker EDM machines use dielectric fluid. Sounds simple enough, but many shops use a cheap mineral oil in an effort to save money. Fluids not designed for use in an EDM system may be dangerous to the operator, the workplace, and could damage your EDM equipment. Mineral oil does not have the fluid properties to be effectively used in EDM. The savings of a couple hundred dollars isn’t worth the risk. Remember, use fluid specifcally designed for EDM.
For low amp fne fnishing work, choose a fluid with a low viscosity. The low viscosity allows the fluid to get into the cut of material and help flush out particles.
Generally, because these fluids have a low viscosity they also have lower flash point - not for rough cutting with high amperage. For roughing work, choose a fluid with a high flash point.
If you are like most shops and the machine is used for every application, choose a good overall performer. Dielectric fluids of good quality normaly provide good overall performance in most EDM situations from fne fnishing to roughing.
 

What dielectric fluid must i choose?

PETROLEUM OR SYNTHETIC ??

Generally a synthetic fluid is better; longer life, better performance, and excellent operator acceptance. However, synthetic fluids cost more and depending on what applications you are using your EDM for, sometimes it makes sense to choose petroleum over synthetic. BUT, be careful when selecting a synthetic.
Some low cost synthetics are not ft to be called synthetics. A low grade “synthetic” or “synthetic blend” is not any better than a good petroleum fluid...and it may be worst!
Keep in mind that highly refned petroleum EDM fluids perform almost as good as many synthetic EDM fluids on the market. However, a petroleum fluid life span is  usually less than a synthetic. In addition, semisynthetic provides some of the benefts of synthetic and is economical for most shops. Generally, if your budget allows choose a quality synthetic fluid. It will last up to 6 times longer than petroleum fluids and will pay for itself in the long run