Please post your results when you test. While I have been using that ratio of borax for over a decade, there is no guarantee that this is the best mix. Any added minerals like the sand some folks use, will decrease the chance of fire. Portland cement is part of the added minerals. With just cardboard and borax you may need more borax.
On 5/26/2013 5:01 PM, Donald Miller wrote:
So around five pounds of borax in my 160 gallon mixer would probably be about right? I'll have to make a batch and check it for fire resistance as my blocks have only heavy cardboard pulp in them.
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