{"product_id":"ultra-white-9-18-investment-casting-master-alloy","title":"Ultra White 9-18 Investment Casting Master Alloy","description":"\u003cp\u003eThe Ultra White 9–18 Investment Casting Master Alloy is a nickel-based white gold master alloy formulated for investment casting and fabrication applications across 10K, 14K, and 18K gold. Sold by the troy ounce (20 pennyweights \/ 31.1 grams), this alloy contains no gold and is designed to be pre-alloyed with fine gold before casting. Note that proprietary metals are present in the formulation in addition to the listed composition, and the alloy may also contain silicon and deoxidizers.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompatible with 10K, 14K, and 18K white gold casting applications\u003c\/li\u003e\n\u003cli\u003eSuitable for both investment casting and fabrication\u003c\/li\u003e\n\u003cli\u003eContains no gold — pre-alloy with fine gold prior to casting\u003c\/li\u003e\n\u003cli\u003eMay also contain silicon and deoxidizers in addition to listed composition\u003c\/li\u003e\n\u003cli\u003eSold by the troy ounce (20 pennyweights \/ 31.1 grams)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition (listed)\u003c\/th\u003e\n\u003ctd\u003eCu 57%, Zn 21%, Ni 22%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGold Content\u003c\/th\u003e\n\u003ctd\u003eContains no gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdditional Ingredients\u003c\/th\u003e\n\u003ctd\u003eProprietary metals; may also contain silicon and deoxidizers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003ePre-Alloying:\u003c\/strong\u003e Pre-alloying all alloy and fine gold with aggressive stirring and fluxing is recommended to ensure a uniform mixture.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStep 1 — Pre-Alloying Temperatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e10K: 1060°C – 1080°C \/ 1940°F – 1976°F\u003c\/li\u003e\n\u003cli\u003e14K–18K: 1050°C – 1060°C \/ 1922°F – 1940°F\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eStep 2 — Casting Temperatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e10K Alloyed Grain: 1055°C – 1075°C \/ 1931°F – 1967°F\u003c\/li\u003e\n\u003cli\u003e14K Alloyed Grain: 1015°C – 1035°C \/ 1859°F – 1895°F\u003c\/li\u003e\n\u003cli\u003e18K Alloyed Grain: 990°C – 1010°C \/ 1814°F – 1850°F\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eMelt temperature may vary with type of unit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFlask Temperature:\u003c\/strong\u003e Normal recommended range is 540°C – 675°C \/ 1004°F – 1247°F, depending on flask size, karat, and jewelry type.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFluxing:\u003c\/strong\u003e Fluxing white gold is extremely important 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 10–12 minutes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInvestment Removal:\u003c\/strong\u003e Most standard investment removers will successfully remove investment powder. Use of aggressive acids is not recommended, as it causes stress corrosion and surface damage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eScrap Mix:\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","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581635199190,"sku":"846-140","price":9.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/ultra-white-9-18-investment-casting-master-alloy-otto-frei.jpg?v=1719957478","url":"https:\/\/www.ottofrei.com\/products\/ultra-white-9-18-investment-casting-master-alloy","provider":"Otto Frei","version":"1.0","type":"link"}