{"id":87019,"date":"2025-06-10T15:16:31","date_gmt":"2025-06-10T07:16:31","guid":{"rendered":"https:\/\/keruiref.com\/?page_id=87019"},"modified":"2025-06-10T15:16:31","modified_gmt":"2025-06-10T07:16:31","slug":"basic-refractory-bricks","status":"publish","type":"page","link":"https:\/\/keruiref.com\/zh\/basic-refractory-bricks\/","title":{"rendered":"\u78b1\u6027\u8010\u706b\u7816"},"content":{"rendered":"<p>Basic Refractory Bricks are a type of refractory material. They mainly consist of alkaline oxides like magnesia and calcium oxide. They have good resistance to high temperatures and basic slag corrosion. Widely used in steel &#8211; making furnaces, glass kilns, etc., they play a crucial role in high &#8211; temperature industrial applications. The following are several common KERUI Basic Refractory Bricks. If you have any needs, please contact us to get the best quotation!<\/p>\n<div class='content-column one_third'>\n<div style=\"padding-right:20px;\">\n<div class=\"rccr\">\n<div class=\"hotpic\">\n<p><a href=\"https:\/\/keruiref.com\/zh\/%e9%95%81%e7%a0%96-2\/\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-8008 size-full\" src=\"https:\/\/keruiref.com\/wp-content\/uploads\/2023\/08\/magnesia-brick-supplier.jpg\" alt=\"\u9541\u7816\u4f9b\u5e94\u5546\" width=\"660\" height=\"495\" srcset=\"https:\/\/keruiref.com\/wp-content\/uploads\/2023\/08\/magnesia-brick-supplier.jpg 660w, https:\/\/keruiref.com\/wp-content\/uploads\/2023\/08\/magnesia-brick-supplier-300x225.jpg 300w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><\/a><\/p>\n<div class=\"phot\">\u70ed<\/div>\n<\/div>\n<div class=\"rccr1\">\n<div class=\"rccr0\"><a href=\"https:\/\/keruiref.com\/zh\/%e9%95%81%e7%a0%96-2\/\" target=\"_blank\" rel=\"noopener\">\u9541\u7816<\/a><\/div>\n<ul>\n<li>MgO% (\u2265)\uff1a89-97.5<\/li>\n<li>\u4f53\u79ef\u5bc6\u5ea6\uff08\u514b\/\u7acb\u65b9\u5398\u7c73\uff09\uff1a2.85-3.0<\/li>\n<li>\u8d1f\u8f7d\u4e0b\u7684\u8010\u6298\u5c04\u7387 (\u2103)\uff1a1500-1700<\/li>\n<li>\u51b7\u538b\u5f3a\u5ea6\uff08\u5146\u5e15\uff09\uff1a45-60<\/li>\n<\/ul>\n<p><a class=\"iinruiry fancybox\" href=\"#contact_form_pop\">\u73b0\u5728<\/a><a class=\"eemail-btn\" href=\"mailto:market@keruiref.com\">\u53d1\u9001\u7535\u5b50\u90ae\u4ef6<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class='content-column one_third'>\n<div style=\"padding-right:20px;\">\n<div class=\"rccr\">\n<div class=\"hotpic\">\n<p><a href=\"https:\/\/keruiref.com\/zh\/%e7%86%94%e8%9e%8d%e9%95%81%e7%a0%96\/\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-83929 size-full\" src=\"https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/Magnesia-Brick.webp\" alt=\"\u9541\u7816\" width=\"660\" height=\"495\" srcset=\"https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/Magnesia-Brick.webp 660w, https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/Magnesia-Brick-300x225.webp 300w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><\/a><\/p>\n<div class=\"phot\">\u70ed<\/div>\n<\/div>\n<div class=\"rccr1\">\n<div class=\"rccr0\"><a href=\"https:\/\/keruiref.com\/zh\/%e7%86%94%e8%9e%8d%e9%95%81%e7%a0%96\/\" target=\"_blank\" rel=\"noopener\">\u7535\u7194\u9541\u7816<\/a><\/div>\n<ul>\n<li>\u6c27\u5316\u9541 \u5316\u5b66\u6210\u5206\uff1a\u226595 \uff05\uff1b<\/li>\n<li>\u8868\u89c2\u5b54\u9699\u7387\uff1a\u226418 \uff05\uff1b<\/li>\n<li>\u51b7\u538b\u5f3a\u5ea6\uff1a\u226555 Mpa\uff1b<\/li>\n<li>\u70ed\u7a33\u5b9a\u6027 950\u2103 \u98ce\u5faa\u73af\uff1a\u226515\uff1b<\/li>\n<\/ul>\n<p><a class=\"iinruiry fancybox\" href=\"#contact_form_pop\">\u73b0\u5728<\/a><a class=\"eemail-btn\" href=\"mailto:market@keruiref.com\">\u53d1\u9001\u7535\u5b50\u90ae\u4ef6<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class='content-column one_third last_column'>\n<div style=\"padding-right:20px;\">\n<div class=\"rccr\">\n<div class=\"hotpic\">\n<p><a href=\"https:\/\/keruiref.com\/zh\/%e9%95%81%e7%a2%b3%e7%a0%96\/\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2796 size-full\" src=\"https:\/\/keruiref.com\/wp-content\/uploads\/2023\/08\/Magnesia-Carbon-Brick-price.jpg\" alt=\"\u9541\u78b3\u7816\u4ef7\u683c\" width=\"660\" height=\"495\" srcset=\"https:\/\/keruiref.com\/wp-content\/uploads\/2023\/08\/Magnesia-Carbon-Brick-price.jpg 660w, https:\/\/keruiref.com\/wp-content\/uploads\/2023\/08\/Magnesia-Carbon-Brick-price-300x225.jpg 300w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><\/a><\/p>\n<div class=\"phot\">\u70ed<\/div>\n<\/div>\n<div class=\"rccr1\">\n<div class=\"rccr0\"><a href=\"https:\/\/keruiref.com\/zh\/%e9%95%81%e7%a2%b3%e7%a0%96\/\" target=\"_blank\" rel=\"noopener\">\u9541\u78b3\u7816<\/a><\/div>\n<ul>\n<li>MgO%: 69-85<\/li>\n<li>C%: 5-18<\/li>\n<li>\u4f53\u79ef\u5bc6\u5ea6\uff08\u514b\/\u7acb\u65b9\u5398\u7c73\uff09\uff1a2.79-3.05<\/li>\n<li>\u51b7\u538b\u5f3a\u5ea6\uff08\u5146\u5e15\uff09\uff1a30-50<\/li>\n<\/ul>\n<p><a class=\"iinruiry fancybox\" href=\"#contact_form_pop\">\u73b0\u5728<\/a><a class=\"eemail-btn\" href=\"mailto:market@keruiref.com\">\u53d1\u9001\u7535\u5b50\u90ae\u4ef6<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class='clear_column'><\/div>\n<div class='content-column one_third'>\n<div style=\"padding-right:20px;\">\n<div class=\"rccr\">\n<div class=\"hotpic\">\n<p><a href=\"https:\/\/keruiref.com\/zh\/%e9%95%81%e9%93%ac%e7%a0%96\/\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-8068 size-full\" src=\"https:\/\/keruiref.com\/wp-content\/uploads\/2023\/08\/magnesia-chrome-brick-manufacturer.jpg\" alt=\"\u9541\u94ec\u7816\u5236\u9020\u5546\" width=\"660\" height=\"495\" srcset=\"https:\/\/keruiref.com\/wp-content\/uploads\/2023\/08\/magnesia-chrome-brick-manufacturer.jpg 660w, https:\/\/keruiref.com\/wp-content\/uploads\/2023\/08\/magnesia-chrome-brick-manufacturer-300x225.jpg 300w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><\/a><\/p>\n<div class=\"phot\">\u70ed<\/div>\n<\/div>\n<div class=\"rccr1\">\n<div class=\"rccr0\"><a href=\"https:\/\/keruiref.com\/zh\/%e9%95%81%e9%93%ac%e7%a0%96\/\" target=\"_blank\" rel=\"noopener\">\u9541\u94ec\u7816<\/a><\/div>\n<ul>\n<li>MgO%(\u2265)\uff1a45-65<\/li>\n<li>Cr2O3%(\u2265)\uff1a8-16<\/li>\n<li>\u8868\u89c2\u5b54\u9699\u7387\/%\uff08\u2264\uff09\uff1a19-21<\/li>\n<li>\u51b7\u538b\u5f3a\u5ea6\uff08\u5146\u5e15\uff09\uff1a20-35<\/li>\n<\/ul>\n<p><a class=\"iinruiry fancybox\" href=\"#contact_form_pop\">\u73b0\u5728<\/a><a class=\"eemail-btn\" href=\"mailto:market@keruiref.com\">\u53d1\u9001\u7535\u5b50\u90ae\u4ef6<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class='content-column one_third'>\n<div style=\"padding-right:20px;\">\n<div class=\"rccr\">\n<div class=\"hotpic\">\n<p><a href=\"https:\/\/keruiref.com\/zh\/%e6%b0%a7%e5%8c%96%e9%95%81%e9%94%86%e7%a0%96\/\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-84069 size-full\" src=\"https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/Magnesia-Zirconia-Brick.webp\" alt=\"\" width=\"660\" height=\"495\" srcset=\"https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/Magnesia-Zirconia-Brick.webp 660w, https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/Magnesia-Zirconia-Brick-300x225.webp 300w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><\/a><\/p>\n<div class=\"phot\">\u70ed<\/div>\n<\/div>\n<div class=\"rccr1\">\n<div class=\"rccr0\"><a href=\"https:\/\/keruiref.com\/zh\/%e6%b0%a7%e5%8c%96%e9%95%81%e9%94%86%e7%a0%96\/\" target=\"_blank\" rel=\"noopener\">\u9541\u9506\u7816<\/a><\/div>\n<ul>\n<li>MgO% \u2265\uff1a70\/75\/80 ZrO2 % \u2265\uff1a8\/10\/13\uff1b<\/li>\n<li>\u8868\u89c2\u5b54\u9699\u7387%\u2264\uff1a19\uff1b<\/li>\n<li>\u4f53\u79ef\u5bc6\u5ea6\uff08g\/cm3\uff09\u2265\uff1a2.95\uff1b<\/li>\n<li>\u8d1f\u8f7d\u4e0b\u7684\u8010\u706b\u5ea6\uff1a\u22651600 \u00b0C<\/li>\n<\/ul>\n<p><a class=\"iinruiry fancybox\" href=\"#contact_form_pop\">\u73b0\u5728<\/a><a class=\"eemail-btn\" href=\"mailto:market@keruiref.com\">\u53d1\u9001\u7535\u5b50\u90ae\u4ef6<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class='content-column one_third last_column'>\n<div style=\"padding-right:20px;\">\n<div class=\"rccr\">\n<div class=\"hotpic\">\n<p><a href=\"https:\/\/keruiref.com\/zh\/%e5%b0%96%e6%99%b6%e7%9f%b3%e7%a0%96\/\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-84309 size-full\" src=\"https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/Magnesia-Alumina-Spinel-Brick-01.webp\" alt=\"\" width=\"660\" height=\"495\" srcset=\"https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/Magnesia-Alumina-Spinel-Brick-01.webp 660w, https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/Magnesia-Alumina-Spinel-Brick-01-300x225.webp 300w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><\/a><\/p>\n<div class=\"phot\">\u70ed<\/div>\n<\/div>\n<div class=\"rccr1\">\n<div class=\"rccr0\"><a href=\"https:\/\/keruiref.com\/zh\/%e5%b0%96%e6%99%b6%e7%9f%b3%e7%a0%96\/\" target=\"_blank\" rel=\"noopener\">\u9541\u5c16\u6676\u77f3\u7816<\/a><\/div>\n<ul>\n<li>MgO\/%(\u2265): 80;<\/li>\n<li>Al2O3\/%\uff08\u2265\uff09\uff1a10<\/li>\n<li>\u4f53\u79ef\u5bc6\u5ea6\uff08\u514b\/\u7acb\u65b9\u5398\u7c73\uff09(\u2265)\uff1a2.90<\/li>\n<li>\u51b7\u538b\u5f3a\u5ea6\uff08\u2265\uff09\uff1a50MPa<\/li>\n<\/ul>\n<p><a class=\"iinruiry fancybox\" href=\"#contact_form_pop\">\u73b0\u5728<\/a><a class=\"eemail-btn\" href=\"mailto:market@keruiref.com\">\u53d1\u9001\u7535\u5b50\u90ae\u4ef6<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class='clear_column'><\/div>\n<div class='content-column one_third'>\n<div style=\"padding-right:20px;\">\n<div class=\"rccr\">\n<div class=\"hotpic\">\n<p><a href=\"https:\/\/keruiref.com\/zh\/%e7%99%bd%e4%ba%91%e7%9f%b3%e7%a0%96\/\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-84472 size-full\" src=\"https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/KERUI-Dolomite-Brick_1.webp\" alt=\"\" width=\"660\" height=\"495\" srcset=\"https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/KERUI-Dolomite-Brick_1.webp 660w, https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/KERUI-Dolomite-Brick_1-300x225.webp 300w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><\/a><\/p>\n<div class=\"phot\">\u70ed<\/div>\n<\/div>\n<div class=\"rccr1\">\n<div class=\"rccr0\"><a href=\"https:\/\/keruiref.com\/zh\/%e7%99%bd%e4%ba%91%e7%9f%b3%e7%a0%96\/\" target=\"_blank\" rel=\"noopener\">\u767d\u4e91\u77f3\u7816<\/a><\/div>\n<ul>\n<li>MgO+CaO%\uff08\u2265\uff09\uff1a92-94\uff1b<\/li>\n<li>CaO%\uff08\u2265\uff09\uff1a18-48\uff1b<\/li>\n<li>\u8868\u89c2\u5b54\u9699\u7387\uff08%\uff09\uff1a15.0\uff1b<\/li>\n<li>\u51b7\u538b\u5f3a\u5ea6\uff08\u5146\u5e15\uff09\uff1a60\uff1b<\/li>\n<\/ul>\n<p><a class=\"iinruiry fancybox\" href=\"#contact_form_pop\">\u73b0\u5728<\/a><a class=\"eemail-btn\" href=\"mailto:market@keruiref.com\">\u53d1\u9001\u7535\u5b50\u90ae\u4ef6<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class='content-column one_third'>\n<div style=\"padding-right:20px;\">\n<div class=\"rccr\">\n<div class=\"hotpic\">\n<p><a href=\"https:\/\/keruiref.com\/zh\/%e7%99%bd%e4%ba%91%e7%9f%b3%e7%a0%96\/\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-84472\" src=\"https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/KERUI-Dolomite-Brick_1.webp\" alt=\"\" width=\"660\" height=\"495\" srcset=\"https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/KERUI-Dolomite-Brick_1.webp 660w, https:\/\/keruiref.com\/wp-content\/uploads\/2025\/02\/KERUI-Dolomite-Brick_1-300x225.webp 300w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><\/a><\/p>\n<div class=\"phot\">\u70ed<\/div>\n<\/div>\n<div class=\"rccr1\">\n<div class=\"rccr0\"><a href=\"https:\/\/keruiref.com\/zh\/%e7%99%bd%e4%ba%91%e7%9f%b3%e7%a0%96\/\" target=\"_blank\" rel=\"noopener\">\u9541\u9499\u7816<\/a><\/div>\n<ul>\n<li>MgO+CaO%\uff08\u2265\uff09\uff1a92-94\uff1b<\/li>\n<li>CaO%\uff08\u2265\uff09\uff1a18-48\uff1b<\/li>\n<li>\u8868\u89c2\u5b54\u9699\u7387\uff08%\uff09\uff1a15.0\uff1b<\/li>\n<li>\u51b7\u538b\u5f3a\u5ea6\uff08\u5146\u5e15\uff09\uff1a60\uff1b<\/li>\n<\/ul>\n<p><a class=\"iinruiry fancybox\" href=\"#contact_form_pop\">\u73b0\u5728<\/a><a class=\"eemail-btn\" href=\"mailto:market@keruiref.com\">\u53d1\u9001\u7535\u5b50\u90ae\u4ef6<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class='content-column one_third last_column'>\n<div style=\"padding-right:20px;\"><\/div>\n<\/div>\n<div class='clear_column'><\/div>\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f328-o1\" lang=\"en-US\" dir=\"ltr\" data-wpcf7-id=\"328\">\n<div class=\"screen-reader-response\">\n<p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\">\n<ul><\/ul>\n<\/div>\n<form action=\"\/zh\/wp-json\/wp\/v2\/pages\/87019#wpcf7-f328-o1\" method=\"post\" class=\"wpcf7-form init\" aria-label=\"\u8054\u7cfb\u8868\u683c\" novalidate=\"novalidate\" data-status=\"init\" data-trp-original-action=\"\/zh\/wp-json\/wp\/v2\/pages\/87019#wpcf7-f328-o1\">\n<div style=\"display: none;\">\n<input type=\"hidden\" name=\"_wpcf7\" value=\"328\" \/><br \/>\n<input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.0.4\" \/><br \/>\n<input type=\"hidden\" name=\"_wpcf7_locale\" value=\"en_US\" \/><br \/>\n<input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f328-o1\" \/><br \/>\n<input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/><br \/>\n<input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" \/><br \/>\n<input type=\"hidden\" name=\"_wpcf7_recaptcha_response\" value=\"\" \/>\n<\/div>\n<div class=\"form-box\" id=\"Contact-Us\">\n<div class=\"isleft\">\n<div class=\"contact-title\">\n<p>\u8054\u7cfb\u6211\u4eec\n\t\t\t<\/p>\n<\/p><\/div>\n<div class=\"contactp\">\n<p>\u8bf7\u5728\u53f3\u8fb9\u7684\u8868\u683c\u4e2d\u586b\u5199\u5e76\u53d1\u9001\u60a8\u7684\u8be2\u4ef7\u3002\u6211\u4eec\u5c06\u57286\u5c0f\u65f6\u5185\u56de\u590d\u60a8\u3002\n\t\t\t<\/p>\n<\/p><\/div>\n<ul class=\"contact\">\n<li class=\"email\">\n<p><img decoding=\"async\" src=\"https:\/\/keruiref.com\/wp-content\/uploads\/2023\/12\/email.png\" alt=\"\" \/>\u7535\u5b50\u90ae\u4ef6\uff1a\n\t\t\t\t<\/p>\n<p><a href=\"mailto:market@keruiref.com\">market@keruiref.com<\/a>\n\t\t\t\t<\/p>\n<\/li>\n<li class=\"phone\">\n<p><img decoding=\"async\" src=\"https:\/\/keruiref.com\/wp-content\/uploads\/2023\/12\/tel.png\" alt=\"\" \/>\u7535\u8bdd\/whatsapp\uff1a\n\t\t\t\t<\/p>\n<p><a href=\"https:\/\/wa.me\/8619138178880\">+86 19138178880<\/a>\n\t\t\t\t<\/p>\n<\/li>\n<li class=\"location\">\n<p><img decoding=\"async\" src=\"https:\/\/keruiref.com\/wp-content\/uploads\/2023\/12\/Location.png\" alt=\"\" \/>\u5236\u9020\u57fa\u5730\uff1a\n\t\t\t\t<\/p>\n<p>\u8d85\u5316\u8010\u706b\u6750\u6599\u5de5\u4e1a\u533a\u3001<br \/>\n\u4e2d\u56fd\u6cb3\u5357\u7701\u65b0\u5bc6\u5e02\n\t\t\t\t<\/p>\n<\/li>\n<\/ul><\/div>\n<div class=\"isright\">\n<ul class=\"contact-input\">\n<li>\n<div class=\"islabel\">\n<p>* \u59d3\u540d\uff1a\n\t\t\t\t\t<\/p>\n<\/p><\/div>\n<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-name\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text wpcf7-validates-as-required\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"\" value=\"\" type=\"text\" name=\"your-name\" \/><\/span>\n\t\t\t\t<\/p>\n<\/li>\n<li>\n<div class=\"islabel\">\n<p>* \u90ae\u7bb1\n\t\t\t\t\t<\/p>\n<\/p><\/div>\n<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-email\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-email wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-email\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"\" value=\"\" type=\"email\" name=\"your-email\" \/><\/span>\n\t\t\t\t<\/p>\n<\/li>\n<li>\n<div class=\"islabel\">\n<p>* \u7535\u8bdd\/\u5fae\u4fe1\n\t\t\t\t\t<\/p>\n<\/p><\/div>\n<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-phone\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-tel wpcf7-text wpcf7-validates-as-tel\" aria-invalid=\"false\" placeholder=\"\" value=\"\" type=\"tel\" name=\"your-phone\" 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They mainly consist of alkaline oxides like magnesia and calcium oxide. They have good resistance to high temperatures and basic slag corrosion. 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