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Are those blocks made of compressed wood chips and fiber? Do they swell up if they get wet?
They appear to be made of compressed wood chips and fiber. I have some just stored out in the sun and rain, and they have not swelled up - yet. So, they might have some kind of coating on them to protect them from rain? I don't know.
I just don't know what to use them for, so if I get too many stacked up, I start tossing them into the burn barrel when burning out a stump. They might be good firewood for a wood furnance, but I don't have one.