Is Hypertufa Fireproof?

Can it take the heat of a flame?

Let's find out.  I'm betting that it's not able to be in or near a fire, because it's concrete, after all, and that's not what it's designed to do.

Is Hypertufa Fireproof?  Let's find out...

Concrete has some great properties, like being stable, able to hold or keep out water in many cases, and it makes great planters. 

Add in some other ingredients, like peat moss and perlite, and things become a little murkier.

The peat moss is actually combustible - have you ever heard of peat bog fires?  They can burn for years underground. 

So this is something that would give me pause if I wanted to use hypertufa over an open flame. It's possible the peat moss will burn away from the concrete, leaving a weak shell.

Broken piece of hypertufa pot in a metal basket over the flame

You've piqued my interest and so this is the experiment.  I've got some hypertufa pots that didn't make the cut, or fell apart - the perfect candidates for experimenting with!

I collected up some duds from where they were languishing in the garden, some of them from around the base of the Clematis, which love the pH of broken hypertufa - who knew?

Get that bonfire burning with the scrap wood that I store in the woodshed, and let's find out.

Flat hypertufa dish on the fireA flat hypertufa dish on the fire, ready for the experiment to begin

I'm ecstatic to say that I was wrong! 

There is absolutely no change in the texture, the strength or the size of the hypertufa that I experimented with.  Here's a picture of the two pieces of broken pot - one left as is, the other put through the incineration process. 

The one on the right is the one that I burned.  The only difference is that the moss growth is gone, but other than that, it's exactly the same as when it went in.

They're identical - both pieces of the broken hypertufa pot are the same...

They fit together, exactly as though they were just broken.

One thing I would hesitate to do with a hot piece of hypertufa pot is put it into cold water.  As it was, these pots were damp from being outside, which didn't seem to bother it a bit. 

Other things to try; this same experiment with dry hypertufa pots, or dunk the hot hypertufa into a bucket of water - all in the interests of science.

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