[Jewelry making - Article 01333] - Re: [Orchid] Vulcanized vs. RTV

[Jwryrubber]

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    Materials improve with time. I have seen a few posts which suggest
    that RTV in general is not as strong as vulcanized natural rubber.
    That was an accurate generalization eight or more years ago. 

    Although we manufacture natural mold rubber, back in 1993, I saw a
    clear need for a high tear strength RTV silicone. Silicones were
    noted for very low tear strength. That was true of both the RTV and
    the heat cured silicones of the day. 

    It took us about a year to develop the characteristics jewelers
    needed. We introduced high tear strength heat cured silicones (4X
    Gold), and a little later, Akron RTV Silicone (clear). 

    Today, a lot of jewelry manufacturers are using Akron RTV Silicone to
    make production molds directly from original waxes, thus completely
    eliminating the model making step. Silicone RTV is initially costly,
    but it makes a permanent mold (unlike the less costly urethane RTV
    which tends to revert over time, especially in moist regions). 

    Manufacturers find that skipping the model making step easily
    underwrites the higher cost of the mold. In addition, throughput
    increases with silicone because of the easy release character. There
    is very little tinkering involved in getting the wax out of the
    mold. Some folks claim to have doubled speed at the pot. 

    I am available at any time to answer questions relative to how
    Silicone RTV can best be used. As with any material, there are some
    limitations, but it is a new day and these products currently save a
    lot of money for the manufacturing jeweler. 

Best wishes,

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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