{"id":12354,"date":"2026-02-12T03:28:13","date_gmt":"2026-02-12T03:28:13","guid":{"rendered":"https:\/\/rawchemicalmart.com\/what-is-yellow-iron-oxide\/"},"modified":"2026-02-12T10:39:44","modified_gmt":"2026-02-12T10:39:44","slug":"o-que-e-oxido-de-ferro-amarelo","status":"publish","type":"post","link":"https:\/\/rawchemicalmart.com\/pt\/o-que-e-oxido-de-ferro-amarelo\/","title":{"rendered":"O que \u00e9 \u00f3xido de ferro amarelo? Propriedades, usos e graus de pureza (Guia 2026)"},"content":{"rendered":"<p><strong>\u00d3xido de ferro amarelo<\/strong> O \u00f3xido f\u00e9rrico hidratado \u00e9 um dos pigmentos inorg\u00e2nicos mais vers\u00e1teis e amplamente utilizados no mundo. Conhecido por sua cor brilhante, excelente resist\u00eancia \u00e0s intemp\u00e9ries e estabilidade qu\u00edmica, desempenha um papel fundamental em diversos setores, desde a constru\u00e7\u00e3o civil e revestimentos at\u00e9 pl\u00e1sticos e borracha.<\/p>\n\n\n\n<p>Seja voc\u00ea um engenheiro qu\u00edmico em busca de especifica\u00e7\u00f5es t\u00e9cnicas ou um respons\u00e1vel por compras procurando mat\u00e9rias-primas, este guia abrange tudo o que voc\u00ea precisa saber sobre o \u00f3xido de ferro amarelo \u2014 desde sua estrutura qu\u00edmica at\u00e9 suas aplica\u00e7\u00f5es industriais.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. O que \u00e9 \u00f3xido de ferro amarelo? (Defini\u00e7\u00e3o e qu\u00edmica)<\/h2>\n\n\n\n<p>Quimicamente, o \u00f3xido de ferro amarelo \u00e9 um \u00f3xido f\u00e9rrico hidratado com a f\u00f3rmula <strong>Fe2O3\u00b7H2O<\/strong> (\u00e0s vezes escrito como FeOOH). Na ind\u00fastria de pigmentos, \u00e9 amplamente conhecido como <strong>Pigmento Amarelo 42 (PY42)<\/strong>.<\/p>\n\n\n\n<p>Diferentemente dos ocres naturais, o \u00f3xido de ferro amarelo sint\u00e9tico usado na ind\u00fastria moderna \u00e9 fabricado para ter alta pureza, tamanho de part\u00edcula uniforme e intensidade de cor consistente.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Identidade Qu\u00edmica Chave<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Nome qu\u00edmico<\/strong>: \u00d3xido de ferro (III) monohidratado<\/li>\n\n\n\n<li><strong>Nome comum<\/strong>: \u00d3xido de Ferro Amarelo<\/li>\n\n\n\n<li><strong>N\u00famero CAS<\/strong>: 51274-00-1<\/li>\n\n\n\n<li><strong>N\u00famero EINECS<\/strong>: 257-098-5<\/li>\n\n\n\n<li><strong>F\u00f3rmula Molecular<\/strong>: Fe2O3\u00b7H2O \/ \u03b1-FeOOH<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">2. Propriedades F\u00edsicas e Qu\u00edmicas<\/h2>\n\n\n\n<p>Por que esse pigmento \u00e9 t\u00e3o popular? Isso se deve \u00e0 sua estabilidade. O \u00f3xido de ferro amarelo n\u00e3o \u00e9 t\u00f3xico, n\u00e3o mancha e \u00e9 resistente a \u00e1lcalis e \u00e1cidos fracos. \u00c9 completamente insol\u00favel em \u00e1gua e solventes org\u00e2nicos.<\/p>\n\n\n\n<p>Segue abaixo uma ficha t\u00e9cnica t\u00edpica para \u00f3xido de ferro amarelo de grau industrial padr\u00e3o:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Propriedade<\/strong><\/td><td><strong>Valor t\u00edpico<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Apar\u00eancia<\/strong><\/td><td>P\u00f3 fino amarelo<\/td><\/tr><tr><td><strong>Teor de Fe2O3<\/strong><\/td><td>\u2265 86%<\/td><\/tr><tr><td><strong>Absor\u00e7\u00e3o de \u00f3leo<\/strong><\/td><td>25-35 ml\/100 g<\/td><\/tr><tr><td><strong>Res\u00edduo em malha 325<\/strong><\/td><td>\u2264 0,3%<\/td><\/tr><tr><td><strong>Umidade (vol\u00e1til a 105\u00b0C)<\/strong><\/td><td>\u2264 1,0%<\/td><\/tr><tr><td><strong>Valor de pH<\/strong><\/td><td>3,5 \u2013 7,0<\/td><\/tr><tr><td><strong>Resist\u00eancia ao calor<\/strong><\/td><td>At\u00e9 180\u00b0C (356\u00b0F)<\/td><\/tr><tr><td><strong>Resist\u00eancia \u00e0 luz<\/strong><\/td><td>Nota 7-8 (Excelente)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Nota: Os valores espec\u00edficos podem variar ligeiramente dependendo do fabricante e da especifica\u00e7\u00e3o.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. Como \u00e9 produzido o \u00f3xido de ferro amarelo?<\/h2>\n\n\n\n<p>Embora existam dep\u00f3sitos naturais, a demanda industrial \u00e9 atendida por meio da produ\u00e7\u00e3o sint\u00e9tica para garantir a consist\u00eancia da qualidade.<\/p>\n\n\n\n<p>O m\u00e9todo de fabrica\u00e7\u00e3o mais comum \u00e9 o <strong>Processo de precipita\u00e7\u00e3o<\/strong> (frequentemente envolvendo o processo Penniman-Zoph). Este processo envolve a oxida\u00e7\u00e3o de sais de ferro e ferro met\u00e1lico em meio \u00e1cido. Controlando rigorosamente a temperatura da rea\u00e7\u00e3o, o pH e a taxa de oxida\u00e7\u00e3o, os fabricantes podem ajustar o tamanho das part\u00edculas, o que influencia diretamente a tonalidade do amarelo (variando de um amarelo-lim\u00e3o p\u00e1lido a um amarelo-alaranjado intenso).<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Saber mais:<\/strong> Para uma an\u00e1lise detalhada da s\u00edntese e das rea\u00e7\u00f5es qu\u00edmicas, leia nosso estudo aprofundado sobre <strong><a href=\"https:\/\/rawchemicalmart.com\/pt\/como-produzir-oxido-de-ferro-amarelo\/\">Como produzir \u00f3xido de ferro amarelo<\/a><\/strong><\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">4. Graus Industriais: Especifica\u00e7\u00f5es do P\u00f3<\/h2>\n\n\n\n<p>Nem todo \u00f3xido de ferro amarelo \u00e9 igual. Dependendo da aplica\u00e7\u00e3o final, voc\u00ea precisar\u00e1 escolher a granulometria correta. Esta se\u00e7\u00e3o substitui a necessidade de um guia separado sobre &quot;p\u00f3s industriais&quot;, detalhando as principais categorias aqui.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">A. Grau para tintas e revestimentos (micronizado)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Caracter\u00edsticas<\/strong>Part\u00edculas ultrafinas, alta dispersibilidade e alto poder de tingimento.<\/li>\n\n\n\n<li><strong>Por que us\u00e1-lo?<\/strong>Impede a flocula\u00e7\u00e3o (aglomera\u00e7\u00e3o) em tintas l\u00edquidas e proporciona um acabamento liso e brilhante.<\/li>\n\n\n\n<li><strong>Tamanho da malha<\/strong>Frequentemente passa por peneiras muito mais finas que a de malha 325.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">B. Grau de Constru\u00e7\u00e3o (Padr\u00e3o)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Caracter\u00edsticas<\/strong>: Econ\u00f4mico, com forte poder de tingimento e excelente resist\u00eancia a \u00e1lcalis.<\/li>\n\n\n\n<li><strong>Por que us\u00e1-lo?<\/strong>Deve resistir ao ambiente altamente alcalino do cimento e do concreto sem desbotar.<\/li>\n\n\n\n<li><strong>Aplicativo<\/strong>Pedras de pavimenta\u00e7\u00e3o, telhas e estuque.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">C. Grau resistente ao calor<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Caracter\u00edsticas<\/strong>Tratado especialmente (frequentemente encapsulado) para suportar temperaturas mais elevadas.<\/li>\n\n\n\n<li><strong>Limita\u00e7\u00e3o<\/strong>O \u00f3xido de ferro amarelo padr\u00e3o come\u00e7a a desidratar e a ficar vermelho (transformando-se em \u00f3xido de ferro vermelho) a aproximadamente 180\u00b0C.<\/li>\n\n\n\n<li><strong>Por que us\u00e1-lo?<\/strong>Necess\u00e1rio para masterbatches de pl\u00e1stico (PE, PP) processados em altas temperaturas.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">5. Principais aplica\u00e7\u00f5es e usos<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Revestimentos e tintas<\/h3>\n\n\n\n<p>Este \u00e9 um dos maiores mercados para o \u00f3xido de ferro amarelo. Ele \u00e9 utilizado em:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Tintas arquitet\u00f4nicas<\/strong>Tintas para paredes externas e internas.<\/li>\n\n\n\n<li><strong>Revestimentos Industriais<\/strong>Primers anticorrosivos (devido \u00e0 sua in\u00e9rcia qu\u00edmica).<\/li>\n\n\n\n<li><strong>Revestimentos em p\u00f3<\/strong>Proporciona uma cor duradoura para acabamento em metal.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Materiais de constru\u00e7\u00e3o<\/h3>\n\n\n\n<p>Por ser quimicamente inerte e resistente aos raios UV, o \u00f3xido de ferro \u00e9 o pigmento padr\u00e3o para colorir concreto. \u00c9 amplamente utilizado em:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tijolos e pavimentos intertravados.<\/li>\n\n\n\n<li>Pisos de concreto colorido.<\/li>\n\n\n\n<li>Telhas para telhado.<\/li>\n\n\n\n<li>M\u00e1rmore e terrazzo artificiais.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Pl\u00e1sticos e borracha<\/h3>\n\n\n\n<p>\u00c9 utilizado como corante em produtos pl\u00e1sticos, oferecendo boa opacidade e prote\u00e7\u00e3o contra a luz. \u00c9 comumente encontrado em masterbatches para materiais de embalagem, revestimentos vin\u00edlicos e pisos de borracha.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">6. Seguran\u00e7a, Manuseio e Armazenamento<\/h2>\n\n\n\n<p>O \u00f3xido de ferro amarelo \u00e9 geralmente considerado seguro e n\u00e3o t\u00f3xico. No entanto, como acontece com qualquer p\u00f3 industrial fino, o manuseio adequado \u00e9 essencial para evitar a inala\u00e7\u00e3o da poeira.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>EPI<\/strong>Os trabalhadores devem usar m\u00e1scaras contra poeira e \u00f3culos de prote\u00e7\u00e3o.<\/li>\n\n\n\n<li><strong>Armazenar<\/strong>Armazene em local fresco e seco, longe da umidade. Mantenha as embalagens fechadas quando n\u00e3o estiverem em uso.<\/li>\n\n\n\n<li><strong>Prazo de validade<\/strong>Quando armazenado corretamente, possui prazo de validade indeterminado, embora 2 a 3 anos seja a recomenda\u00e7\u00e3o padr\u00e3o para um desempenho de dispers\u00e3o ideal.<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Seguran\u00e7a em primeiro lugar:<\/strong> Para obter dados detalhados sobre toxicidade e protocolos de manuseio, consulte nosso artigo sobre <strong><a href=\"https:\/\/rawchemicalmart.com\/pt\/seguranca-do-oxido-de-ferro-amarelo\/\">Seguran\u00e7a do \u00f3xido de ferro amarelo<\/a><\/strong>.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Conclus\u00e3o<\/h2>\n\n\n\n<p>O \u00f3xido de ferro amarelo \u00e9 um pigmento indispens\u00e1vel para a ind\u00fastria moderna, equilibrando desempenho e custo-benef\u00edcio. Seja para formular um novo revestimento resistente aos raios UV ou para fabricar pavimentos de concreto coloridos, compreender as propriedades e as classes de \u00f3xido de ferro desse material \u00e9 fundamental para o sucesso do produto.<\/p>\n\n\n\n<p><strong>Procura \u00f3xido de ferro amarelo de alta qualidade?<\/strong> Entre em contato conosco hoje mesmo para solicitar um or\u00e7amento ou uma amostra de nossos pigmentos de grau industrial.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p class=\"tmnf_excerpt\">Guia completo sobre o \u00d3xido de Ferro Amarelo (CAS 51274-00-1). Descubra suas propriedades qu\u00edmicas, processo de fabrica\u00e7\u00e3o, graus de p\u00f3 industrial e aplica\u00e7\u00f5es em revestimentos e constru\u00e7\u00e3o.\n<\/p>","protected":false},"author":3,"featured_media":12349,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[62],"tags":[],"class_list":["post-12354","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-iron-oxide-pigment"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is Yellow Iron Oxide? Properties, Uses &amp; Grades (2026 Guide)<\/title>\n<meta name=\"description\" content=\"Comprehensive guide to Yellow Iron Oxide (CAS 51274-00-1). 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