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I've see all kinds of material comparisons between MDF and Plywood. Has anyone tried composite decking? (Hint Hint to Brandon).
I've got some scraps and wondered about trying it out, but I'm not going to be able to do any scientific measuring to confirm the results.
I see it's as dense/slightly denser than MDF at 60 pounds per cubic foot. It cuts/machines nicely in my CNC for sign making, and it comes in 1" thickness if you want extra thick baffles.
MSDS lists it as:
INGREDIENTS ARE CONTAINED IN A POLYETHYLENE MATRIX. Contains
used thermoplastics and waste wood. Plastic obtained primarily from reclaimed/recycled grocery
bags and stretch film; wood fiber is typically obtained from furniture makers and/or waste pallets.
Standard product is approximately 40% - 50% thermoplastic and 50% - 60% wood fiber
so I guess we are mostly substituting polyethylene plastic for urea-formaldehyde resin as the binder, and we have a bit less wood, with bigger particles.