Wardrobe interior materials

The most common material used is 18mm MFC (melamine faced chipboard), this is the industry standard for carcass and shelves, depending on the construction method the backs tend to be 8mm MFC but this varies. You can of course use MDF (medium density fibreboard) but then you will need to paint it and also edge band it to get a decent finish. It sounds to me as if this is a DIY project (?), the problem you have there is that the full range of materials in MFC is not easily available to the public. The DIY sheds will have some stock but only in a very limited range of sizes and finishes, however if you are only fitting out an existing space this might solve your problem. Post again if you would like further advice. Kind regards. Spacecraft Designs

mdf 20 mm

There are no real standard options, to be honest. Different companies offer different options. It really does depend on the final finish you are looking for?! There are pros and cons to both MDF or MFC. I personally opt for moisture-resistant MDF which both machines and paints better than the cheaper MDF options. This works perfectly for those that are opting for a professional spray painted finish. In terms of carcass construction 18mm for the main structure and 6mm back boards are more than sufficient.