Re: [ATM] Metal Mirrors and Thermite

["lafotec" <lafotec@thewaynet.com.br>]

----- Original Message -----
From: "Colton" <clnoble@email.arizona.edu>
To: <atm@atmlist.net>
Sent: Wednesday, September 15, 2004 3:21 AM
Subject: [ATM] Metal Mirrors and Thermite


>>You're right.
>>Chemical Nickel is commonly applied over aluminium pieces in plastic
injection moulding dies.
>>7075 aluminium alloy (Fortal, Dural, Hard and others propertary names) is
the most suitable to that.
>>Laercio Oliveira.
>>Brazil.

> A thermite reaction does not involve nickel.  It involves Aluminum and
> Fe2O3, essentially rust.  It takes a blow torch even to get that reaction
> started.  Nickel overcoats on aluminum mirrors are safe and are used
because
> the nickel takes the polish, whereas the aluminum will not.  They are
safe,
> and have never had one explode on me.
>
> Colton Noble
> Tucson, Arizona


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