{"product_id":"white-9-18k-investment-casting-master-alloy-nickel-based-per-troy-ounce","title":"White 9-18 Investment Casting Master Alloy-Per Troy Ounce (20DWT)","description":"\u003cp\u003eThis nickel-based white master alloy — previously called \u003cem\u003eWhite Century\u003c\/em\u003e — is formulated for investment casting and fabrication of 9K–18K white gold. Specially engineered for peak performance in enclosed or automated casting equipment, it contains copper, nickel, and zinc, plus a small amount of silicon as a deoxidizer. Additional proprietary metals are present in the formulation that are not listed in the published composition. Sold by the troy ounce (20 pennyweight \/ 31.1 grams).\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNickel-based alloy suitable for 9K–18K white gold casting and fabrication\u003c\/li\u003e\n\u003cli\u003eProduces a white finished color\u003c\/li\u003e\n\u003cli\u003eOptimized for enclosed and automated casting equipment\u003c\/li\u003e\n\u003cli\u003eContains silicon as a deoxidizer for cleaner melts\u003c\/li\u003e\n\u003cli\u003ePreviously marketed as White Century alloy\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eAlloy Base\u003c\/th\u003e\n\u003ctd\u003eNickel-based\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Copper (Cu)\u003c\/th\u003e\n\u003ctd\u003e57.7%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Zinc (Zn)\u003c\/th\u003e\n\u003ctd\u003e18.1%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Nickel (Ni)\u003c\/th\u003e\n\u003ctd\u003e24.2%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdditional Components\u003c\/th\u003e\n\u003ctd\u003eSilicon (deoxidizer); proprietary metals not disclosed in composition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKarat Range\u003c\/th\u003e\n\u003ctd\u003e9K – 18K white gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 DWT \/ 31.1 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003ctd\u003e846-100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eUsage Instructions\u003c\/h3\u003e\n\u003cp\u003ePre-alloy all alloy and fine gold together with aggressive stirring and fluxing to ensure a uniform mixture before casting.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep 1 – Pre-Alloying Temperature (fine gold + alloy):\u003c\/strong\u003e 1050°C – 1060°C \/ 1922°F – 1940°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep 2 – Casting Temperature for 9K–10K alloyed grain:\u003c\/strong\u003e 1030°C – 1040°C \/ 1886°F – 1904°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep 3 – Casting Temperature for 14K–18K alloyed grain:\u003c\/strong\u003e 1000°C – 1020°C \/ 1832°F – 1868°F\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eFlask Temperature:\u003c\/strong\u003e 580°C – 700°C \/ 1076°F – 1292°F, depending on flask size, karat, and jewelry type.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFluxing:\u003c\/strong\u003e Fluxing white gold is critical for collecting oxides. Boric acid is the recommended flux. Do not use carbon fluxes or refining fluxes such as soda ash or saltpeter. Avoid flux in bottom-pour automatic casting units.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuench Time:\u003c\/strong\u003e 10–15 minutes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInvestment Removal:\u003c\/strong\u003e Most standard investment removers will successfully remove investment powder. Aggressive acids cause stress corrosion and surface damage and are not recommended.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eScrap Reuse:\u003c\/strong\u003e A 70% fresh–30% scrap mix is recommended. White gold alloy has approximately one-third the reusability of yellow gold alloys.\u003c\/p\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMelt temperature may vary depending on casting unit type.\u003c\/li\u003e\n\u003cli\u003eProprietary metals are present in the formulation and are not included in the published composition percentages.\u003c\/li\u003e\n\u003cli\u003eThis product contains nickel. See California Proposition 65 warnings as applicable.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581633790166,"sku":"846-100","price":7.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/white-9-18-investment-casting-master-alloy-per-troy-ounce-20dwt-otto-frei.jpg?v=1719957479","url":"https:\/\/www.ottofrei.com\/products\/white-9-18k-investment-casting-master-alloy-nickel-based-per-troy-ounce","provider":"Otto Frei","version":"1.0","type":"link"}