Lub luag haujlwm ntawm strontium carbonate hauv glaze: frit yog ua ntej smelt cov khoom siv raw lossis ua lub cev iav, uas yog cov khoom siv flux raw rau ceramic glaze. Thaum pre-smelt rau hauv flux, feem ntau ntawm cov roj tuaj yeem raug tshem tawm ntawm cov khoom siv glaze raw, yog li txo qhov tsim ntawm cov npuas thiab cov qhov me me ntawm qhov chaw ceramic glaze. Qhov no yog qhov tseem ceeb tshwj xeeb rau cov khoom siv ceramic nrog qhov kub siab thiab lub voj voog luv luv, xws li cov khoom siv ceramic txhua hnub thiab cov khoom siv ceramic huv.
Tam sim no cov frits siv dav hauv cov khoom siv ua los ntawm cov tais diav zoo uas kub sai. Vim nws qhov kub yaj pib qis thiab qhov kub kub loj, frit muaj lub luag haujlwm tseem ceeb hauv kev npaj cov khoom siv ceramic uas kub sai. Rau cov porcelain uas kub kub dua, cov khoom siv raw yeej ib txwm siv ua cov glaze tseem ceeb. Txawm tias cov frit siv rau cov glaze, qhov ntau ntawm cov frit yog me me heev (qhov ntau ntawm cov frit hauv cov glaze tsawg dua 30%.).
Cov khoom siv frit uas tsis muaj lead yog ib yam khoom siv hauv kev ua cov khoom siv frit rau cov khoom siv ceramic. Nws yog ua los ntawm cov khoom siv raw li nram no: 15-30% ntawm quartz, 30-50% ntawm feldspar, 7-15% ntawm borax, 5-15% ntawm boric acid, 3-6% ntawm barium carbonate, 6-6% ntawm stalactite. 12%, zinc oxide 3-6%, strontium carbonate 2-5%, lithium carbonate 2-4%, slaked talc 2-4%, aluminium hydroxide 2-8%. Kev ua tiav xoom yaj ntawm cov hlau lead tuaj yeem ua tau raws li tib neeg xav tau kev noj qab haus huv thiab zoo ceramics.