No you csn't machine the material which are non conductive by using edm.But there is a drived machining process which is used for machining non-conducting material(like ceramics, brittle materials) is ECDM(Electro Chemical Discharge Machining).

Wire EDM uses a thin wire to remove surrounding material, where conventional EDM uses a shaped electrode to remove material.

In ordinary machining we use harder tool to work on workpiece , this limitation is overcome by unconventional machining. unconventional machining is directly using some sort of indirect energy for machining. Example : sparks, lasers, heat , chemicals etc.. applied in EDM ,laser cutting machines...etc

The main difference between EDM (Electrical Discharge Machining) and ECM (Electrochemical Machining) machines is in their working principles:

EDM (Electrical Discharge Machining): EDM uses electrical discharges to remove material from a workpiece. It relies on sparks or discharges of electrical energy to erode the material, making it suitable for hard metals and complex shapes.

ECM (Electrochemical Machining): ECM employs a chemical process to remove material. It uses an electrolyte solution and an electrically conductive tool to dissolve or erode the workpiece material, making it effective for conducting materials like alloys and difficult-to-machine metals.

In summary, EDM uses electrical discharges, while ECM uses an electrochemical process to shape and machine materials.

There are many forms - what one do you mean in particular?