Looks like they're press-molding papercrete.
ElfN
----- Original Message -----
From: "tl_atx" <tl_atx@yahoo.com>
> I got an email from Mason Greenstar about their new web site. On it
> they have a new product, a CMU-like block. It's a papercrete block
> with a core in it like I proposed a long time ago and was summarily
> po-poohed by all the "experts".
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