Are you referring to MDF? That’s been around for over a dozen years that I’ve used it. It’s heavy but great stuff around kids as its straw-based material does not leave any slivers, though it makes a lot of dust in cutting. It’s a bit heavierthan plywood and as it has no “grain”, you simply need to forecast how you want to assemble with it - you drill a hole or screw through it, not really into it, especially not sideways.
It absorbs water and swells like particle board, but polyuretane it and it stays looking “wet” and is perfect for computer tables for the kids (the edges will never give a sliver.
You don’t sand it, but take the fuzzy edge off after cutting by using a rasp or file.
I make things out of wood, like a frame for a computer table, then put the RMD across the top and another across the back for egg-crating.
Great for work benches too.
In Michigan it was much cheaper than plywood (half-inch is very useful) but a few years later (inflation) and in Maryland it is now more expensive than plywood and not as available (could be it’s expensive to ship here or the price has gone up).
Not for exterior. If you make a box with it, just use wood for the four inner posts or triangles to screw into and it’s very strong.
My boys drew outlines of full size M-16’s on a sheet and we cut them out - they loved them! When the tips broke off via bending (not a strong suite), I glued popsicle sticks to either side to hold it together....breaks like particle board but not glue-able at the break due to being like “paper”.
It’s very smooth purchased so no need to sand either side.
I love the stuff for what it’s great for.
Soaks kerosene up like a sponge so makes good torches for back yard play in 1-2 inch wide strips.
OOps - I alwasy call it three different letters, but it’s MDF!!!
And that new PVC 1x6 stuff is great too! (many sizes - for exterior as wont rot. Used it to raise the toilet!