{"id":283,"date":"2022-05-17T10:09:57","date_gmt":"2022-05-17T10:09:57","guid":{"rendered":"https:\/\/localhost\/crystalline02\/?page_id=283"},"modified":"2024-03-25T20:55:44","modified_gmt":"2024-03-25T20:55:44","slug":"frit-znna5515","status":"publish","type":"post","link":"https:\/\/crystallineceramics.co.uk\/crystalline\/frit-znna5515\/","title":{"rendered":"Zinc Sodium Frit"},"content":{"rendered":"[et_pb_section admin_label=&#8221;section&#8221;]\n\t\t\t[et_pb_row admin_label=&#8221;row&#8221;]\n\t\t\t\t[et_pb_column type=&#8221;4_4&#8243;][et_pb_text admin_label=&#8221;Text&#8221;]\n<p>Most of my crystalline glazes use frits that I make myself.<\/p>\n\n\n\n<p>Frits play a central role in crystalline glaze recipes. These pre-melted glasses provide the necessary glaze components in an insoluble form.<\/p>\n\n\n\n<p>A great many frit compositions are available but none are formulated specifically for the unusual requirements of the zinc silicate crystalline glaze. Many commercially available frits are somewhat variable in nature. No doubt they are sufficiently well controlled for their intended purpose, but the crystalline potter, requiring exacting control over glaze compositions, will be all too familiar with the frustration of having to deal with batch to batch variations.  Ferro 3110 is present in a great many popular recipes but it suffers from variability.<\/p>\n\n\n\n<p>What would ideal crystalline frits look like? Zinc oxide can form a substantial proportion of the flux, a feature which would be unsuitable for most other types of glaze. It should also contain a high proportion of the main alkali metal fluxes. Ideally it would contain no alumina thereby allowing some clay to be used in the recipe to improve the application characteristics. It goes without saying that it should have very low solubility.<\/p>\n\n\n\n<p>I have developed several frits that meet these requirements. One of the most versatile I call \u2018ZnNa5515\u2019, it has the molar proportions:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Na<sub>2<\/sub>O\t0.5\tSiO<sub>2<\/sub>\t1.5\nZnO\t0.5<\/pre>\n\n\n\n<p>As an example of its use, consider this popular formulation for a cone 9 crystalline glaze:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">NaKO\t0.21\tAl<sub>2<\/sub>O<sub>3<\/sub>\t0.03\tSiO<sub>2<\/sub>\t1.7\nCaO\t0.11\tB<sub>2<\/sub>O<sub>3<\/sub>\t0.03\nZnO\t0.68<\/pre>\n\n\n\n<p>Realised using 3110 frit, one recipe for this glaze is:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Ferro 3110 frit\t 42.0\nCalcium carbonate 1.2\nZinc Oxide\t 29.6\nKaolin\t\t  2.8\t\t\nSilica\t\t 24.5<\/pre>\n\n\n\n<p>With ZnNa5515 frit, it is:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">ZnNa5515 frit\t 33.4\nFerro 3134 frit\t  4.8\nCalcium carbonate 4.1\nZinc oxide \t 20.8\nKaolin\t\t  6.8\nSilica\t\t 30.0\n<\/pre>\n\n\n\n<p>These two give almost identical fired results but the second has much better application characteristics (because the kaolin is more than double). ZnNa5515 has very low solubility, lower than the popular Ferro 3134 (which can cause problems if the glaze is stored in liquid form over an extended period \u2013 consider using Ferro 3195 instead if it is a problem).<\/p>\n\n\n\n<p>I make ZnNa5515  by fusing the correct proportions of zinc oxide, sodium carbonate (soda ash) and silica at around 1200 \u00baC and then ball milling the resulting glass to a powder passing 100s mesh.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"600\" src=\"https:\/\/crystallineceramics.co.uk\/crystalline\/wp-content\/uploads\/2022\/07\/ZnNa5515_Frit_900w.jpg\" alt=\"\" class=\"wp-image-877\" srcset=\"https:\/\/crystallineceramics.co.uk\/crystalline\/wp-content\/uploads\/2022\/07\/ZnNa5515_Frit_900w.jpg 900w, https:\/\/crystallineceramics.co.uk\/crystalline\/wp-content\/uploads\/2022\/07\/ZnNa5515_Frit_900w-300x200.jpg 300w, https:\/\/crystallineceramics.co.uk\/crystalline\/wp-content\/uploads\/2022\/07\/ZnNa5515_Frit_900w-768x512.jpg 768w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><figcaption>Chunks of ZnNa5515 frit ready to be crushed and milled to a powder.<\/figcaption><\/figure>\n[\/et_pb_text][\/et_pb_column]\n\t\t\t[\/et_pb_row]\n\t\t[\/et_pb_section]","protected":false},"excerpt":{"rendered":"<p>Details of a zinc-sodium frit useful in formulating crystalline glazes.<\/p>\n","protected":false},"author":1,"featured_media":876,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"<!-- wp:paragraph -->\n<p>Most of my crystalline glazes use frits that I make myself.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>Frits play a central role in crystalline glaze recipes. These pre-melted glasses provide the necessary glaze components in an insoluble form.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>A great many frit compositions are available but none are formulated specifically for the unusual requirements of the zinc silicate crystalline glaze. Many commercially available frits are somewhat variable in nature. No doubt they are sufficiently well controlled for their intended purpose, but the crystalline potter, requiring exacting control over glaze compositions, will be all too familiar with the frustration of having to deal with batch to batch variations.  Ferro 3110 is present in a great many popular recipes but it suffers from variability.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>What would ideal crystalline frits look like? Zinc oxide can form a substantial proportion of the flux, a feature which would be unsuitable for most other types of glaze. It should also contain a high proportion of the main alkali metal fluxes. Ideally it would contain no alumina thereby allowing some clay to be used in the recipe to improve the application characteristics. It goes without saying that it should have very low solubility.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>I have developed several frits that meet these requirements. One of the most versatile I call \u2018ZnNa5515\u2019, it has the molar proportions:<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:preformatted -->\n<pre class=\"wp-block-preformatted\">Na<sub>2<\/sub>O\t0.5\tSiO<sub>2<\/sub>\t1.5\nZnO\t0.5<\/pre>\n<!-- \/wp:preformatted -->\n\n<!-- wp:paragraph -->\n<p>As an example of its use, consider this popular formulation for a cone 9 crystalline glaze:<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:preformatted -->\n<pre class=\"wp-block-preformatted\">NaKO\t0.21\tAl<sub>2<\/sub>O<sub>3<\/sub>\t0.03\tSiO<sub>2<\/sub>\t1.7\nCaO\t0.11\tB<sub>2<\/sub>O<sub>3<\/sub>\t0.03\nZnO\t0.68<\/pre>\n<!-- \/wp:preformatted -->\n\n<!-- wp:paragraph -->\n<p>Realised using 3110 frit, one recipe for this glaze is:<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:preformatted -->\n<pre class=\"wp-block-preformatted\">Ferro 3110 frit\t 42.0\nCalcium carbonate 1.2\nZinc Oxide\t 29.6\nKaolin\t\t  2.8\t\t\nSilica\t\t 24.5<\/pre>\n<!-- \/wp:preformatted -->\n\n<!-- wp:paragraph -->\n<p>With ZnNa5515 frit, it is:<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:preformatted -->\n<pre class=\"wp-block-preformatted\">ZnNa5515 frit\t 33.4\nFerro 3134 frit\t  4.8\nCalcium carbonate 4.1\nZinc oxide \t 20.8\nKaolin\t\t  6.8\nSilica\t\t 30.0\n<\/pre>\n<!-- \/wp:preformatted -->\n\n<!-- wp:paragraph -->\n<p>These two give almost identical fired results but the second has much better application characteristics (because the kaolin is more than double). ZnNa5515 has very low solubility, lower than the popular Ferro 3134 (which can cause problems if the glaze is stored in liquid form over an extended period \u2013 consider using Ferro 3195 instead if it is a problem).<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>I make ZnNa5515  by fusing the correct proportions of zinc oxide, sodium carbonate (soda ash) and silica at around 1200 \u00baC and then ball milling the resulting glass to a powder passing 100s mesh.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:image {\"id\":877,\"sizeSlug\":\"full\",\"linkDestination\":\"none\"} -->\n<figure class=\"wp-block-image size-full\"><img src=\"https:\/\/crystallineceramics.co.uk\/crystalline\/wp-content\/uploads\/2022\/07\/ZnNa5515_Frit_900w.jpg\" alt=\"\" class=\"wp-image-877\"\/><figcaption>Chunks of ZnNa5515 frit ready to be crushed and milled to a powder.<\/figcaption><\/figure>\n<!-- \/wp:image -->","_et_gb_content_width":"","footnotes":""},"categories":[11],"tags":[],"class_list":["post-283","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-articles"],"_links":{"self":[{"href":"https:\/\/crystallineceramics.co.uk\/crystalline\/wp-json\/wp\/v2\/posts\/283","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/crystallineceramics.co.uk\/crystalline\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/crystallineceramics.co.uk\/crystalline\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/crystallineceramics.co.uk\/crystalline\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/crystallineceramics.co.uk\/crystalline\/wp-json\/wp\/v2\/comments?post=283"}],"version-history":[{"count":13,"href":"https:\/\/crystallineceramics.co.uk\/crystalline\/wp-json\/wp\/v2\/posts\/283\/revisions"}],"predecessor-version":[{"id":248842,"href":"https:\/\/crystallineceramics.co.uk\/crystalline\/wp-json\/wp\/v2\/posts\/283\/revisions\/248842"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/crystallineceramics.co.uk\/crystalline\/wp-json\/wp\/v2\/media\/876"}],"wp:attachment":[{"href":"https:\/\/crystallineceramics.co.uk\/crystalline\/wp-json\/wp\/v2\/media?parent=283"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/crystallineceramics.co.uk\/crystalline\/wp-json\/wp\/v2\/categories?post=283"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/crystallineceramics.co.uk\/crystalline\/wp-json\/wp\/v2\/tags?post=283"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}