[Homeroast] aluminum for roasting

Rich rich-mail at octoxol.com
Mon Apr 12 16:41:11 CDT 2010


Aluminum melts/liquefies at ~1100F  and is plastic at ~950F.  As long as 
you are not directly heating the aluminum sheet it will be fine at 
roasting temperatures.

Mike Koenig wrote:
> A few points on Aluminum (or Aluminium if you are so inclined):
> 
> 1.  It is the 3rd most abundant element on the planet, so avoiding it in
> your diet is nearly impossible.  You get between 2-25 mg/day just by eating
> normal food, which far exceeds any exposure you may get from your coffee
> equipment.
> 
> 2.  Uncoated Aluminum surfaces quickly form a layer of Aluminum oxide which
> is remarkably stable and prevents solutions (such as water or coffee) from
> attacking the metallic layer underneath.   The only way you MAY get some
> aluminum dissolving in water (or coffee, beer or whatnot)  is to scour the
> surface, then quickly expose it to the solution before the oxide layer has a
> chance to form.
> 
> 3.  The link between Aluminum intake from diet and Alzheimers is not widely
> accepted (except by internet fearmongers), and even the Alzheimer's Society
> states that there is no correlation, especially given the large amount
> consumed on a daily basis in a normal diet in most of the population.
> 
> That being said,  I once used an Aluminum rod for a drum roaster on my
> Grill, and found that it would bend if I let the grill get too hot,  so
> maybe it's not the ideal metal for use in roasters.
> 
> --mike
> 
> 
> 
> 
> On Mon, Apr 12, 2010 at 2:18 PM, Joseph Robertson <theotherjo at gmail.com>wrote:
> 
>>  I remember the, what I think was inconclusive studies on this. Technically
>> speaking I believe Al is considered a heavy metal even though it sounds
>> like
>> an oxymoron. If the metal can enter my system through what ever method. I
>> will steer around using it. Remember the stove top little espresso makers?
>> They used to be made only of Al. Now many from Italy are Stainless.
>> Although the Al ones are still sold. I used to look down inside at the
>> decaying Al that looked like an oxidizing mineral decaying soup. Never will
>> I go back to and consume any amount of that questionable stuff. Give me
>> good
>> Ole cast iron or stainless.
>> Nice for building some things not food related.
>> Don't mind my rambling memories. Give me a good cup of Joe and who knows
>> what I will ramble on about.????????????? ;)
>> On Mon, Apr 12, 2010 at 9:16 AM, Tom Ulmer <tom at transtate.us> wrote:
>>
>>> For a year or so I used an aluminum WhirlyPop to roast. Besides third eye
>>> development I've noticed no ill effects.
>>>
>>> I believe there was news a few years ago which attempted a correlation of
>>> aluminum levels in the body to Alzheimer's disease.
>>>
>>> -----Original Message-----
>>> From: homeroast-bounces at lists.sweetmariascoffee.com
>>> [mailto:homeroast-bounces at lists.sweetmariascoffee.com] On Behalf Of john
>>> Sent: Monday, April 12, 2010 10:36 AM
>>> To: HomeRoast List
>>> Subject: [Homeroast] aluminum for roasting
>>>
>>> does anyone know if aluminum is a safe metal to have in contact with
>> beans
>>> at roast temperatures?  more specifically, i have an aluminum cookie
>> sheet
>>> that i'd like to use as sheet metal for parts in fabricating a new drum.
>>> the drum is cast iron, but i'm thinking of using the aluminum as an exit
>>> door for the beans.
>>>
>>> however, if that's safe, it's got me thinking about using a turkey frying
>>> pot as a drum.  if it's ok for cookies, is it ok for coffee?  ...would be
>>> much higher temperatures.
>>>
>>> thanks,
>>>
>>> -john
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>>
>>
>> --
>> Ambassador for Specialty Coffee and palate reform.
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