You'd be surprised at how dense MDF isn't. In some industrial applications, it's actually used as an air filter.

What? I work in a ton of different industrial environments. I've never seen that before. What app are you talking about?

I'm not 100% sure, but I recall Dan Wiggins telling me that years ago. Someplace had it in a place he did some industrial noise cancellation solution for.

You'd be surprised at how dense MDF isn't. In some industrial applications, it's actually used as an air filter.

But it is more dense than plywood. Plywood is more rigid though.