[TheForge] Re: Bricks- Light vs heavy

[Chuck Robinson]

Steve, I finally got down my old A. P. Green Hand book they list over 30 
different types of fire brick.
Chuck
----- Original Message ----- 
From: "Steve Smith" <sos at alum.mit.edu>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Sunday, April 23, 2006 6:53 PM
Subject: Re: [TheForge] Re: Bricks- Light vs heavy


>I don't remember where I heard this, but what I heard was that the "heavy 
>duty" bricks commonly called firebrick are used in boilers. They are 
>specifically intended to retain heat and even out the heat coming out of a 
>boiler. This is quite a different use than our needs.
>
> I find that the insulating bricks last quite well against thermal cycling, 
> it's dropping them off the forge that causes cracks. The ones I use are 
> pure white and can be carved with your fingernail.
>
> Steve
>
> Jeffrey Polaski wrote:
>
>> I'm sure someone who actually knows can answer this, but the
>> "insulating" bricks seem to be better *insulators*, so I imagine they
>> loose heat the slowest. But they have less mass, so they cooler sooner
>> than the heavy-duty ones.
>>
>> The heavy-duty ones take a lot longer to heat up, and stay hot much
>> longer. I can still feel heat from my forge for 8 -- 12 hours or so when
>> I use heavy-duty bricks. BTW, is there a better name for these bricks, 
>> other than "insulating"
>> and heavy-duty? Is that clear to everyone? Is that the terminology
>> people use when they talk about these things?
>>
>>
>> Jeff Polaski
>> Research and Graduate Studies Webmaster
>> University of California, Irvine
>> http://www.rgs.uci.edu/
>> 949.824.6363
>
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