Porous MDF waste board?

[tumutbound]

Using MDF as a spoil board on top of a vacuum table is quite common (check out cnczone.com or woodworkforums.com).
I seem to recall a recommendation of sealing the edge of the spoil board with paint.

Standard MDF is certainly porous.

[quickcut]

A wrap door machine uses vacuum to pull the pvc covering over the door . mdf is indeed porous. not sure about hdf though

[Troop]

I don't exactly know if this has been resolved however as Toddy said about MDF being non porous i believe he has had the sherbets.
I use 6mm and 4mm MDF and this is perfect for Vac pump.
I am currently looking for a different material that is more porous as using VillMill material is a good extra for any wasteboard.

[TheChunk]

I found a video showing this, I'm amazed that it works.

http://www.nemi.com/flow_thru_vacuum_demonstration.htm

One on YouTube as well.

http://www.youtube.com/watch?v=Egw6l...eature=related

[fasteddy]

Thats it TheChunk..!!!

I remember the bit about taping up the edges now.. Well found..! Just pulled apart my cnc for another upgrade so cant try it this week, but will definately give it a go next week.. Thanks dude..

Steve..