RE: [PSUBS-MAILIST] Brass vs. Bronze

["PSUBS" <jon@psubs.org>]

Jay,

Wow, I'm surprised the styrofoam lasts long enough to allow the metal to
solidify.

Jon


-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]On Behalf Of Jay K.
Jeffries
Sent: Tuesday, April 11, 2006 9:54 AM
To: personal_submersibles@psubs.org
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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603-529-1100
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