{"product_id":"prni-black-stoneware-clay-276lb-cone-6-10","title":"PRNI Black Stoneware Clay 27.6lb (Cone 5 - 6)","description":"\u003cp\u003e\u003cstrong\u003eBlack Stoneware Clay with Impalpable Grog\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eBlack stoneware clay body with 40% impalpable grog (up to 80 Mesh). Formulated for artistic ceramics, it is ideal for wheel-throwing and modeling smooth pieces with fine details. The high content of grog confers an excellent behavior during drying and firing. Its beautiful and intense black firing color in oxidizing atmosphere is very exclusive of PRN range and becomes an ideal artistic mean of expression. In reducing atmosphere, metallic effects with shades of blue are obtained. Suitable for tableware (\u003cstrong\u003efood-safe\u003c\/strong\u003e), according to \u003ca href=\"https:\/\/www.sio-2.com\/iso-6486\" target=\"_blank\" rel=\"noopener\"\u003eISO 6486\u003c\/a\u003e. Available in extruded body (moist form).\u003cbr\u003e\u003cbr\u003eFiring range: \u003cstrong\u003eCone 5-6 (2205º-2269ºF)\u003c\/strong\u003e\u003cbr\u003eBiscuit: Cone 06 (1855ºF)\u003cbr\u003eWater content: 21%\u003cbr\u003ePlasticity (IP Atterberg): 22\u003cbr\u003eCarbonate content (CaCO3): 0%\u003cbr\u003eDrying shrinkage: 7.0%\u003cbr\u003eFiring shrinkage at Cone 6: 7.1%\u003cbr\u003ePorosity (water absorption) at Cone 6: 1.3%\u003cbr\u003eDry bending strength: 4.6 N\/mm2\u003cbr\u003eFired bending strength at Cone 6: 33.3 N\/mm2\u003cbr\u003eThermal coefficient (a25-500ºC): 51.1x10-7ºC-1\u003c\/p\u003e\r\n\u003cp\u003e\u003cstrong\u003eRecommendations for use with glazes\u003c\/strong\u003e\u003cbr\u003eUse zinc-free (Zn-free) glazes to prevent from unexpected reactions such as bubbling or color changes. Other elements that can react are zirconium (Zr) and tin (Sn). We recommend consulting your usual glaze supplier to ensure proper suitability with this ceramic clay body.\u003c\/p\u003e","brand":"SIO-2","offers":[{"title":"Default","offer_id":48015231320379,"sku":"13 610 201","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/7539\/6411\/files\/prni.jpg?v=1714235431","url":"https:\/\/maacaffestore.com\/products\/prni-black-stoneware-clay-276lb-cone-6-10","provider":"The Compleat Sculptor, Inc","version":"1.0","type":"link"}