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Patina brass vs silicone bronze11/3/2023 ![]() Its forms are almost limitless since it may be cast in any shape for which a mold can be devised. Statuary bronze is typically used in outdoor sculpture. Location and exposure to rain, sun, and other climatic conditionsĪdjacent materials including residual core materials Patination or other protective treatments applied at the foundry The stages of bronze corrosion vary in duration and time of onset, based on many factors, including: Exposed bronze undergoes continuous change and progresses through several predictable "stages" of oxidation and corrosion. Bronze usually exhibits some patination or corrosion so that its color normally ranges from lime green to dark brown. In its "raw" state, bronze is a semi-pink or salmon-colored metal however it is rarely seen in its pure state. Bronze composition may vary significantly however, and contemporary bronzes are typically copper alloys which may contain silicon (Si), manganese (Mn), aluminum (Al), zinc (Zn) and other elements, with or without tin (Sn). Traditionally, a copper alloy which contains zinc is a "brass" a copper alloy which contains tin (not exceeding 11%) is a "bronze". Statuary Bronze - approximately 97% copper (Cu), 2% tin (Sn) and 1% zinc (Zn) this composition is the closest to "true" bronze.Īrchitectural Bronze - actually more of a "leaded brass", this composition is commonly composed of approximately 57% copper (Cu), 40% zinc (Zn) and 3% lead (Pb).Ĭommercial Bronze - composed of approximately 90% copper (Cu) and 10% zinc (Zn). ![]() "True" bronze is a combination of approximately 90% copper (Cu) and 10% tin (Sn), however there are three major classes or types of "bronzes" used in sculpture and construction. The variations in bronze (both in proportion and elemental composition) can significantly affect its weathering characteristics. It is often used where a material harder than copper is required, where strength and corrosion resistance is required and for ornamental purposes. New York: Wiley, 2004.īronze is an alloy of copper which can vary widely in its composition. Conserving Buildings: Guide to Techniques and Materials (1st Edition). Washington, DC: Department of the Interior, National Park Service, 1992. Metals in America's Historic Buildings: Uses and Preservation Treatments. ![]() ![]() See also "Checklist for Inspecting Bronze Failures". The following guidelines provide general information on the characteristics and common uses of bronze and identify typical problems associated with the material. Method is the best alternative or compliant with current environmental regulations and safety standards. Serve as general guidelines and do not constitute a federal endorsement nor a determination that a product or Should only be applied under the guidance of a qualified preservation professional who can assess theĪpplicability of a procedure to a particular building, project or location. We’ve reviewed these procedures for general consistency with federal standardsįor rehabilitating historic buildings and provide them only as a reference. To serve as a resource, not a substitute, for specification development by a qualified preservation Or is compliant with current environmental regulations and safety standards. References to products and suppliers are to serve as a general guideline and do not constitute a federalĮndorsement or determination that a product or method is the best or most current alternative, remains available, All specifications require project-specificĮditing and professional judgement regarding the applicability of a procedure to a particular building, project or With the Secretary of Interior Standards for rehabilitating historic buildingsĪs understood at the time the procedure is added to the library. Do not wait too long as the wax will become too hard to burnish.Prior to inclusion in GSA’s library of procedures, documents are reviewedīy one or more qualified preservation specialists for general consistency Use a lint-free cloth (such as a microfiber cloth) to buff. If you are applying the wax to a hot surface, let the surface cool down completely, then buff. The colored waxes generally take longer to dry. Build up in recessed areas may be desirable with the colored waxes.īurnish the finish when the wax is dry (usually 1-2 hours). Try not to let the clear wax fill up in any recessed areas as it may turn opaque when dry. Stippling with a brush may be the preferred method of application so as to not create streaking on the surface. When applying, smooth down any ridges or bumps. However, they should not be applied to extremely hot surfaces. These metal waxes can be applied to hot or cold surfaces. These waxes contain UV inhibitors and hardeners making them incredibly durable and long lasting on all types of metal. The finest quality waxes have been blended into a nonabrasive formula specifically to protect patinas and metal finishes. Sculpt Nouveau's Metal Wax is for protecting patinas and metal finishes.
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