Catalog excerpts
JRVT HIGH NOBLE YELLOW TYPE 2 or 3 CROWN & BRIDGE ALLOY JRVT is Jensen’s premier 77% Au crown and bridge alloy. Professionals who specialize in gold restorative work prefer JRVT because it has an exceptional rich yellow color and polishes to a mirror-like luster. JRVT has 55% elongation which means it’s extremely burnishable. JRVT is perfect for inlays, onlays, crowns, and short-span bridges. PROPERTIES Melting Range Tensile Elongation Grain Size Contains less than 1% Zinc, Indium, Iridium Tensile Yield Strength Ultimate Tensile Strength Classification - High Noble PROCESSING TECHNIQUE SPRUING The indirect method is recommended for small bridges. Direct spruing is recommended for inlays, onlays and crowns. Sprue to the bulkiest section. Patterns should be 1/4 inch (6mm) from the top of the ring. Gypsum bonded investment is recommended. For bridges and full crowns use the thermal technique with a burnout temperature of 1200ºF (650ºC). The hygroscopic technique and a burnout temperature of 900ºF (480ºC) is recommended for inlays and onlays. JRVT can be melted with gas and compressed air. When melting with gas and oxygen, set gas pressure at 5 psi. and oxygen pressure at 10 psi. Cast the alloy when it is fully puddled, balled and free from oxide on the surface. Carbon based casting fluxes may be used but should not be necessary when melting with a reducing flame. JRVT can be water quenched or bench cooled without changes in its properties. The casting temperature is 1850ºF (1010ºC). Devested castings may be pickled. If aluminum oxide blasting is used, protect marginal areas. Use a fine stone to establish a uniform surface finish. POLISHING Use low speeds and light pressure 1. Rubber wheel with white flexi wheel 2. Polish with tripoli compound using a soft or medium felt wheel and/or a soft Robinson brush 3. Using a rag wheel and/or a soft Robinson brush polish with rouge 4. Ultransonically clean in water or ethyl alcohol for five minutes then shine with tin oxide and soft Robinson brush dry or with ethyl alcohol SOLDER AND FLUX Solder: 650 Fine Solder Flux: Brown Fluoride Flux Jensen Industries, Inc. 50 Stillman Road North Haven, CT 06473 USA Jensen GmbH Gustav – Werner Str. 1 D-72555 Metzingen Freecall: 0800-8 57 32 30 info@jensendental.de www.jensendental.de Jensen Technical Service is available 8:00 AM - 8:00 PM EST by calling 1
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