{"product_id":"premium-white-9k-18k-silicon-free-casting-master-alloy-per-troy-ounce","title":"Premium White 9-18 Silicon Free Casting Master Alloy-Per Troy Ounce (20DWT)","description":"\u003cp\u003ePremium White 9–18 Silicon Free Casting Master Alloy is a professional-grade white gold master alloy formulated for both casting and fabrication applications. 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 to produce white gold alloys from 9K through 18K. The formulation is noted as silicon free in its designation, though the manufacturer notes that proprietary metals, silicon, and deoxidizers may be present in the full composition.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSuitable for casting and fabrication applications across 9K, 10K, 14K, and 18K white gold\u003c\/li\u003e\n\u003cli\u003ePre-alloying with fine gold is recommended, with aggressive stirring and fluxing to ensure uniform mixture\u003c\/li\u003e\n\u003cli\u003eBoric acid is the recommended flux; carbon fluxes and refining fluxes (soda ash, saltpeter, etc.) should be avoided\u003c\/li\u003e\n\u003cli\u003eAvoid flux in bottom-pour automatic casting units\u003c\/li\u003e\n\u003cli\u003eStandard investment removers are compatible for investment removal; aggressive acids are not recommended due to risk of stress corrosion and surface damage\u003c\/li\u003e\n\u003cli\u003eWhite gold alloy has approximately one-third the reusability of yellow gold alloys; a 70% fresh–30% scrap mix is recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition\u003c\/th\u003e\n\u003ctd\u003eCu 55%, Zn 20%, Ni 25% (plus proprietary metals; may also contain silicon and deoxidizers)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eContains Gold\u003c\/th\u003e\n\u003ctd\u003eNo\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\u003ctr\u003e\n\u003cth\u003eCompatible Karat Range\u003c\/th\u003e\n\u003ctd\u003e9K – 18K white gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePre-Alloying Temp (10K)\u003c\/th\u003e\n\u003ctd\u003e1100°C – 1120°C \/ 2012°F – 2048°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePre-Alloying Temp (14K–18K)\u003c\/th\u003e\n\u003ctd\u003e1050°C – 1070°C \/ 1922°F – 1958°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCasting Temp (10K)\u003c\/th\u003e\n\u003ctd\u003e1095°C – 1115°C \/ 2003°F – 2039°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCasting Temp (14K)\u003c\/th\u003e\n\u003ctd\u003e995°C – 1015°C \/ 1823°F – 1859°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCasting Temp (18K)\u003c\/th\u003e\n\u003ctd\u003e985°C – 1005°C \/ 1805°F – 1841°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlask Temperature\u003c\/th\u003e\n\u003ctd\u003e540°C – 675°C \/ 1004°F – 1247°F (varies by flask size, karat, and jewelry type)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuench Time\u003c\/th\u003e\n\u003ctd\u003e20–30 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Flux\u003c\/th\u003e\n\u003ctd\u003eBoric acid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003eMelt temperature may vary depending on the type of casting unit used. Fluxing is extremely important when working with white gold to ensure proper oxide pickup. The composition listed reflects the primary declared metals; proprietary metals and processing aids may also be present. Confirm all technical parameters are appropriate for your specific equipment and application before use.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":44245843312854,"sku":"846-900","price":8.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/premium-white-9-18-silicon-free-casting-master-alloy-per-troy-ounce-20dwt-otto-frei.jpg?v=1726697577","url":"https:\/\/www.ottofrei.com\/es\/products\/premium-white-9k-18k-silicon-free-casting-master-alloy-per-troy-ounce","provider":"Otto Frei","version":"1.0","type":"link"}