I need to machine a 10x10mm chamfer along the edges of a large quantity of MDF (medium density fibreboard) boards, on an ongoing basis.
Previously I've been using standard tool-steel blades for this on a spindle moulder and have noticed that the blades dull and become too blunt to use effectively very quickly - much more quickly than when using the cutters on hardwood. Generally these cutters will run something like 100 linear metres of a 10x10mm chamfer before they're useless and have to be replaced or resharpened.
Is there a better blade material to use for this? I seem to remember I've read that tungsten carbide blades are not great to use on MDF for some reason? Are diamond tipped blades better / more cost-effective in the long run for this purpose?
(Also before anybody mentions that you're not supposed to use power tools on MDF, I have the proper extraction setup etc. to deal with the hazardous MDF dust/fumes.)