What are the values of thickness of recast layers in Electro discharge machining?

• A. 0.001 to 0.025 ¬¨¬®¬¨¬µm
• B. 0.01 to 0.25 ¬¨¬®¬¨¬µm
• C. 1 to 25 ¬¨¬®¬¨¬µm
• D. 10 to 250 ¬¨¬®¬¨¬µm