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[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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