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What Is Grog Measured In, Weight Or Volume?


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Many thanks.   Spoken to a couple of other people and it seems this is the general consensus

 

I'll quickly explain what I'm doing.  I'm making insulative fire bricks, with a mixture of say 2 parts clay to 1 part sawdust by weight.  I believe this works out around 1 : 6 by volume ( clay : sawdust).  I'm doing several test pieces to determine what is the best ratio of organic matter to clay to build a stove body.  As such I will do some pieces with grog.  If I can determine the amount of shrinkage, then I will just build my bricks bigger to begin with, so grog is only really there to avoid cracks.  Cracks in my stove wouldn't be good.

 

I only really want to start with two percentages of grog at both ends of the spectrum to give me an idea of where I should go next.

So 0% is the first, and the other I was thinking 40% by weight.  So that would be 4 parts grog, 4 parts sawdust, 2 parts clay be weight.

 

Not sure if this is a bit extreme.  After all, I'm really after the lightest brick for the highest strength.  If I put too much grog in there, it will lose it's insulative properties.  Anyway, just wanted to get others thoughts

 

Cheers 

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