Re: [PSUBS-MAILIST] Brass vs. Bronze

["George Slaterpryce" <gslaterp@hotmail.com>]

You have to use acetone to remove the styrofoam and then bake your mold to 
cook out any resdue for lost foam. If you pour molten aluminum into a mold 
with foam still in it, bad things tend to happen. 
http://www.backyardmetalcasting.com is a good resource for casting metals.

George Slaterpryce
----- Original Message ----- 
From: "Jay K. Jeffries" <bottomgun@mindspring.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, April 11, 2006 9:54 AM
Subject: [PSUBS-MAILIST] Brass vs. Bronze


> Something to take into consideration when taking metal objects in or 
> underwater is that you want to specify bronze and not brass.  Brass looses 
> zinc around salt water becoming weak over time (this can happen fast if 
> placed close to the wrong dissimilar metal).  While we talk about brass 
> around the water, most items made for the marine environment are bronze 
> and not brass.  If you are having something manufactured, you should 
> specify bronze...naval bronze or a silicon bronze (if I remember 
> correctly) are better choices in the bronze family.
>
> When casting, a rubber mold can easily be made around a wood or wax model 
> if additional pieces need to be poured.  Another option for one off pieces 
> that does not require the wax to be burned out of the casting mold is to 
> model in expanded styrofoam.  When the molten metal is poured into the 
> casting mold, the styrofoam vaporizes and leaves a relatively clean 
> finished piece.  A side benefit of this method is that very complicated 
> items not feasible with wax can be modeled from glued together pieces of 
> styro and cast.  This has been used to form engine blocks in recent years 
> with sand casting molds.
> Respectfully,
> Jay K. Jeffries
> Andros Is., Bahamas
>
>
>
>
>
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