[Jewelry making - Article 01355] - Re: [Orchid] vulcanized vs. RTV

[Jwryrubber]

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    First, is that the responsibility of making the mold from a wax
    pattern or other non metallic part is the responsibility of the
    manufacturer... So .. what happens if the pattern is broken in the
    process? Oh well... another patern may need to be made... and at
    what expense !!! 

    Hi, Dan--sorry I was unable to present much depth in my effort to
    quickly pass on useful information relating to the use of RTV
    Silicones. You are correct, and many manufacturers still follow the
    route you outline. However, the original wax or SLA is at risk if
    you need to invest it in the model making process. Many original
    waxes are lost at this point. Many folks think that the original wax
    is at lower risk for loss if it breaks in the mold cutting process.
    Why? because you still have the mold from which to shoot copies. The
    shrink of platinum cure RTV is under 1/10 of 1% if cured at room
    temperature, so the dimensional change in the mold does not affect
    these applications. An 1/8" section will shrink less than .000125".
    Of course there are other shrink considerations down line, but I did
    not intend to address these as they do not relate directly to my
    original point. 

Cheers!

Bill Mull

Zero-D Products, Inc.
38285 North Lane. #103
Willoughby, OH 44094 USA
800-382-3271
440-942-1150
fax 440 942 2130
WWW.ZERODPRODUCTS.COM


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