MDF is basically a mixture of fine wood fibers and a binder that's pressed into plywood-like sheets. Since MDF has no "grain", it's very stable. The sheets are flat and will stay that way. And with carbide-tipped bits and blades, it machines smoothly and easily. Topping it all off,
This is all I can find., but doesnt say thickness
MDF is relatively inexpensive. Some drawbacks to MDF are its weight (a 4'x8' sheet will weigh ~90 lbs) and water resistance. MDF is more moisture tolerant than particleboard, but WILL swell upon contact with water.
MDF DUST IS TOXIC! CARE SHOULD BE TAKEN TO AVOID INHALING IT. BREATHING PROTECTION IS A MUST WHEN WORKING WITH THIS MATERIAL. EFFECTS OF INHALATION ARE EXTREMELY HARMFUL TO YOUR HEALTH