{"id":16416,"date":"2026-05-12T10:24:02","date_gmt":"2026-05-12T10:24:02","guid":{"rendered":"https:\/\/www.quartz-grinding.com\/?p=16416"},"modified":"2026-05-29T05:38:25","modified_gmt":"2026-05-29T05:38:25","slug":"why-the-glass-industry-cant-do-without-quartz-sand-key-quality-requirements-explained","status":"publish","type":"post","link":"https:\/\/www.quartz-grinding.com\/pt\/why-the-glass-industry-cant-do-without-quartz-sand-key-quality-requirements-explained\/","title":{"rendered":"Por que a ind\u00fastria do vidro n\u00e3o pode prescindir da areia de quartzo: Requisitos de qualidade essenciais explicados"},"content":{"rendered":"

Silicon dioxide (SiO\u2082) forms the structural backbone of glass, providing high mechanical strength and excellent chemical stability. Because of this,   quartz sand is the single most important industrial mineral raw material in the glass industry. It serves as the primary ingredient in everything from flat glass and container glass to ultra-clear glass, photovoltaic glass, and even quartz glass.<\/p>\n\n\n\n

Para os fabricantes de vidro, a qualidade da areia de quartzo determina diretamente a qualidade do produto final. A ind\u00fastria avalia a areia de quartzo principalmente atrav\u00e9s de tr\u00eas perspectivas cr\u00edticas:<\/p>\n\n\n\n

– Composi\u00e7\u00e3o qu\u00edmica<\/strong> \u2013 N\u00edveis de pureza e impurezas, especialmente de ferro e alumina.<\/p>\n\n\n\n

– Consist\u00eancia e estabilidade<\/strong> \u2013 Qualidade uniforme de lote para lote.<\/p>\n\n\n\n

– Distribui\u00e7\u00e3o do tamanho das part\u00edculas<\/strong> \u2013 o tamanho e a forma corretos dos gr\u00e3os para uma fus\u00e3o eficiente e homog\u00eanea.<\/p>\n\n\n\n

No entanto, nem todo vidro \u00e9 criado da mesma forma, e cada tipo de produto de vidro exige uma granulometria diferente de areia de quartzo. Vamos explorar como esses requisitos se distribuem entre as principais categorias de vidro.<\/p>\n\n\n\n

\"Moinho
Moinho a jato da Epic Powder para quartzo de alta pureza<\/figcaption><\/figure>\n\n\n\n

1. Classifica\u00e7\u00e3o da areia de quartzo para a ind\u00fastria vidreira<\/h2>\n\n\n\n

A norma industrial chinesa define o sistema de classifica\u00e7\u00e3o e os m\u00e9todos de teste para areia de quartzo processada utilizada em todos os tipos de fabrica\u00e7\u00e3o de vidro. Essa norma continua a servir como refer\u00eancia fundamental para fornecedores e fabricantes de vidro, auxiliando-os na sele\u00e7\u00e3o da granulometria de areia adequada \u00e0 aplica\u00e7\u00e3o pretendida.<\/p>\n\n\n\n

Nota<\/strong><\/strong><\/td>Nome<\/strong><\/strong><\/td>SiO\u2082 \u2265 (%)<\/strong><\/strong><\/td>Fe\u2082O\u2083 (ppm)<\/strong><\/strong><\/td>Cr (ppm)<\/strong><\/strong><\/td>Al (ppm)<\/strong><\/strong><\/td>Ti (ppm)<\/strong><\/strong><\/td>Li (ppm)<\/strong><\/strong><\/td>Na (ppm)<\/strong><\/strong><\/td>K (ppm)<\/strong><\/strong><\/td>Perda na igni\u00e7\u00e3o \u2264 (%)<\/strong><\/strong><\/td><\/tr>
1<\/td>Areia de quartzo ultrapura<\/td>99.98<\/td>2<\/td>0.5<\/td>30<\/td>2<\/td>3<\/td>3<\/td>3<\/td>0.1<\/td><\/tr>
2<\/td>Areia de quartzo de alta pureza<\/td>99.98<\/td>4<\/td>0.5<\/td>70<\/td>3<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td><\/tr>
3<\/td>Areia de quartzo flutuante<\/td>99.95<\/td>20<\/td>1.0<\/td>\u2013<\/td>5<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td><\/tr>
4<\/td>Areia de quartzo lavada com \u00e1cido<\/td>99.6<\/td>50<\/td>2.0<\/td>\u2013<\/td>300<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td><\/tr>
5<\/td>Areia de quartzo cristalino<\/td>99.0<\/td>200<\/td>2.0<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td><\/tr>
6<\/td>Areia de quartzo para vidro de laborat\u00f3rio<\/td>99.0<\/td>300<\/td>2.0<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td><\/tr>
7<\/td>Areia de quartzo comum<\/td>98.5<\/td>400<\/td>6.0<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td><\/tr>
8<\/td>Areia de quartzo geral<\/td>98.5<\/td>600<\/td>6.0<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td><\/tr>
9<\/td>Areia de quartzo refrat\u00e1ria<\/td>97.0<\/td>2000<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

2. Vidro plano<\/h2>\n\n\n\n

O vidro plano abrange uma ampla gama de aplica\u00e7\u00f5es subsequentes, e as especifica\u00e7\u00f5es da areia de quartzo podem variar de acordo. De forma geral, o setor de vidro plano categoriza a areia de quartzo em dois tipos com base na composi\u00e7\u00e3o qu\u00edmica e no tamanho dos gr\u00e3os:<\/p>\n\n\n\n

    \n
  • Tipo I: Baixo teor de Al\u2082O\u2083<\/li>\n\n\n\n
  • Tipo II: Maior teor de Al\u2082O\u2083<\/li>\n<\/ul>\n\n\n\n

    The professional standard JC\/T 529-2000 \u201cSiliceous Raw Materials for Flat Glass\u201d sets out detailed requirements for chemical composition and particle size distribution. The key parameters are as below.<\/p>\n\n\n\n

    Composi\u00e7\u00e3o qu\u00edmica e requisitos de umidade para areia de quartzo para vidro plano<\/h3>\n\n\n\n
    Areia de quartzo de alta qualidade<\/strong><\/strong><\/td>w(SiO\u2082) \/ %<\/strong><\/strong><\/td>w(Al\u2082O\u2083) \/ %<\/strong><\/strong><\/td>w(Fe\u2082O\u2083) \/ %<\/strong><\/strong><\/td>w(H\u2082O) \/ %<\/strong><\/strong><\/td><\/tr>
    Classe I<\/strong><\/td> <\/td> <\/td> <\/td>\u22645,00<\/td><\/tr>
    Premium<\/td>\u226598,50<\/td>\u22640,50<\/td>\u22640,05<\/td> <\/td><\/tr>
     <\/td>\u226598,00<\/td>\u22641,20<\/td> <\/td> <\/td><\/tr>
    Primeiro ano<\/td>\u226598,50<\/td>\u22640,70<\/td>\u22640,10<\/td> <\/td><\/tr>
     <\/td>\u226597,50<\/td>\u22641,20<\/td> <\/td> <\/td><\/tr>
    Segundo ano<\/td>\u226598,00<\/td>\u22640,70<\/td>\u22640,15<\/td> <\/td><\/tr>
     <\/td>\u226596,50<\/td>\u22641,50<\/td> <\/td> <\/td><\/tr>
    Terceiro ano<\/td>\u226598,00<\/td>\u22640,70<\/td>\u22640,20<\/td> <\/td><\/tr>
     <\/td>\u226596,50<\/td>\u22641,50<\/td> <\/td> <\/td><\/tr>
    Classe II<\/strong><\/td> <\/td> <\/td> <\/td> <\/td><\/tr>
    Primeiro ano<\/td>\u226592,00<\/td>\u22644,00<\/td>\u22640,20<\/td> <\/td><\/tr>
    Segundo ano<\/td>\u226590,50<\/td>\u22644,50<\/td>\u22640,30<\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Varia\u00e7\u00e3o admiss\u00edvel na composi\u00e7\u00e3o qu\u00edmica da areia de quartzo para vidro plano<\/h3>\n\n\n\n
    Areia de quartzo de alta qualidade<\/strong><\/strong><\/td>Varia\u00e7\u00e3o de SiO\u2082 \/ %<\/strong><\/strong><\/td>Varia\u00e7\u00e3o de Al\u2082O\u2083 \/ %<\/strong><\/strong><\/td>Varia\u00e7\u00e3o de Fe\u2082O\u2083 \/ %<\/strong><\/strong><\/td><\/tr>
    Classe I<\/strong><\/td> <\/td> <\/td> <\/td><\/tr>
    Premium<\/td>\u00b10,20<\/td>\u00b10,10<\/td>\u00b10,01<\/td><\/tr>
    Primeiro ano<\/td>\u00b10,30<\/td>\u00b10,15<\/td>\u2013<\/td><\/tr>
    Segundo ano<\/td>\u00b10,30<\/td>\u00b10,20<\/td>\u2013<\/td><\/tr>
    Terceiro ano<\/td>\u00b10,30<\/td>\u00b10,20<\/td>\u2013<\/td><\/tr>
    Classe II<\/strong><\/td> <\/td> <\/td> <\/td><\/tr>
    Primeiro ano<\/td>\u00b10,30<\/td>\u00b10,20<\/td>\u2013<\/td><\/tr>
    Segundo ano<\/td>\u00b10,30<\/td>\u00b10,20<\/td>\u2013<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Requisitos de distribui\u00e7\u00e3o granulom\u00e9trica para areia de quartzo para vidro plano<\/h3>\n\n\n\n
    Areia de quartzo de alta qualidade<\/strong><\/strong><\/td>+1 mm<\/strong><\/strong><\/td>+710 \u03bcm<\/strong><\/strong><\/td>+500 \u03bcm<\/strong><\/strong><\/td>\u2013100 \u03bcm (\u2013125 \u03bcm)<\/strong><\/strong><\/td><\/tr>
    Classe I<\/strong><\/td> <\/td> <\/td> <\/td> <\/td><\/tr>
    Premium<\/td>\u22640 (0)<\/td>\u22640,5 (0,5)<\/td>\u22645,0 (5,0)<\/td>\u22645,0 (5,0)<\/td><\/tr>
    Primeiro ano<\/td>\u22640 (0)<\/td>\u22640,5 (0,5)<\/td>\u22645,0 (5,0)<\/td>\u226410,0 (5,0)<\/td><\/tr>
    Segundo ano<\/td> <\/td> <\/td> <\/td>\u226420,0 (8,0)<\/td><\/tr>
    Terceiro ano<\/td> <\/td> <\/td> <\/td> <\/td><\/tr>
    Classe II<\/strong><\/td> <\/td> <\/td> <\/td> <\/td><\/tr>
    Primeiro ano<\/td>\u22640 (0)<\/td>\u22640,5 (0,5)<\/td>\u22645,0 (5,0)<\/td>\u22645,0<\/td><\/tr>
    Segundo ano<\/td>\u22640 (0)<\/td>\u22640,5 (0,5)<\/td>\u22645,0 (5,0)<\/td>\u22645,0<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Observa\u00e7\u00e3o:<\/strong> Os valores entre par\u00eanteses indicam os requisitos para produtos de areia de s\u00edlica natural.<\/p>\n\n\n\n

    3. Recipientes e Vidro Dom\u00e9stico<\/h2>\n\n\n\n

    Os produtos de vidro para uso dom\u00e9stico e para embalagens incluem garrafas e frascos, utens\u00edlios de mesa, vidraria de laborat\u00f3rio e vidro farmac\u00eautico. Eles atendem \u00e0s ind\u00fastrias aliment\u00edcia, de bebidas, de bebidas alco\u00f3licas e m\u00e9dica. A areia de quartzo representa uma grande propor\u00e7\u00e3o da mistura de lotes neste segmento.<\/p>\n\n\n\n

    Since the melting temperature of quartz sand is around 1730\u00b0C, the particle size of the sand grains has a huge influence on glass formation and melting efficiency. In actual production, people usually prefer angular quartz particles\u00a0because their larger surface area helps prevent batch segregation. The optimal particle size range for this application is typically \u00a0\u00a060 to 140 mesh.<\/p>\n\n\n\n

    For fine tableware and instrument glass, the geological exploration specification DZ\/T 0207-2002\u00a0provides quality requirements for siliceous raw materials. <\/p>\n\n\n\n

    Requisitos de qualidade para areia de quartzo utilizada em vidraria de laborat\u00f3rio<\/h3>\n\n\n\n
    Item\/Par\u00e2metro<\/strong><\/strong><\/td>Primeiro ano<\/strong><\/strong><\/td>Segundo ano<\/strong><\/strong><\/td>Terceiro ano<\/strong><\/strong><\/td><\/tr>
    Composi\u00e7\u00e3o Qu\u00edmica<\/strong><\/td> <\/td> <\/td> <\/td><\/tr>
    w(SiO\u2082) \/ %<\/td>>99<\/td>>96<\/td>>90<\/td><\/tr>
    w(Al\u2082O\u2083) \/ %<\/td><1,0<\/td><2,0<\/td><4,0<\/td><\/tr>
    w(Fe\u2082O\u2083) \/ %<\/td><0,05<\/td><0,10<\/td><0,35<\/td><\/tr>
    w(Cr\u2082O\u2083) \/ %<\/td><0,001<\/td>\u2013<\/td>\u2013<\/td><\/tr>
    Observa\u00e7\u00f5es<\/strong><\/td>Artigos de vidro (exceto cristal)<\/td>Vidro de laborat\u00f3rio geral, vidro incolor<\/td>Utilizado para vidro de garrafa comum.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    4. Vidro ultratransparente<\/h2>\n\n\n\n

    O vidro ultratransparente \u00e9 um material de alta qualidade conhecido por sua alt\u00edssima transmit\u00e2ncia luminosa (\u226591,5%), baix\u00edssimo teor de ferro (tipicamente entre 100 e 150 ppm) e transpar\u00eancia cristalina. Tamb\u00e9m \u00e9 chamado de vidro de baixo teor de ferro ou vidro de alta transpar\u00eancia.<\/p>\n\n\n\n

    A produ\u00e7\u00e3o de vidro ultratransparente exige uma combina\u00e7\u00e3o rigorosa de mat\u00e9rias-primas, incluindo areia de quartzo, feldspato, dolomita, calc\u00e1rio, carbonato de s\u00f3dio, hidr\u00f3xido de alum\u00ednio, sal grosso, piroantimonato de s\u00f3dio e tri\u00f3xido de antim\u00f4nio. Dentre esses componentes, o SiO\u2082 representa aproximadamente 71,0\u201373,01 TP\/3T da mistura, e as impurezas nocivas \u2013 principalmente o ferro \u2013 s\u00e3o introduzidas quase que exclusivamente pela areia de quartzo. Portanto, a purifica\u00e7\u00e3o da areia de quartzo concentra-se principalmente na remo\u00e7\u00e3o das impurezas de ferro.<\/p>\n\n\n\n

    Quando o teor de ferro ultrapassa um determinado limite, n\u00e3o s\u00f3 a transmiss\u00e3o de luz diminui significativamente, como os \u00f3xidos de ferro tamb\u00e9m absorvem a radia\u00e7\u00e3o t\u00e9rmica durante o processo de fus\u00e3o. Isso cria um gradiente de temperatura acentuado entre as camadas superior e inferior do vidro fundido, dificultando a convec\u00e7\u00e3o e complicando bastante a fus\u00e3o e o refino. Por essa raz\u00e3o, o teor de ferro da s\u00edlica como mat\u00e9ria-prima \u00e9 o par\u00e2metro de projeto mais cr\u00edtico. Os requisitos t\u00edpicos de ferro para areia de quartzo usada em vidro ultratransparente s\u00e3o:<\/p>\n\n\n\n

    –   Fe\u2082O\u2083 \u2264 150 ppm<\/p>\n\n\n\n

    –   Fe \u2264 80 ppm<\/p>\n\n\n\n

    Os materiais de quartzo natural utilizados incluem areia de quartzo natural, arenito de quartzo, quartzito e quartzo com veios.<\/p>\n\n\n\n

    Valores de controle para \u00f3xidos ativos e impurezas nocivas em mat\u00e9rias-primas para vidro ultrabranco (Unidade: wt%)<\/h3>\n\n\n\n
    Mat\u00e9ria-prima<\/strong><\/strong><\/td>SiO\u2082<\/strong><\/strong><\/td>Al\u2082O\u2083<\/strong><\/strong><\/td>Fe\u2082O\u2083<\/strong><\/strong><\/td>CaO<\/strong><\/strong><\/td>MgO<\/strong><\/strong><\/td>Na\u2082CO\u2083<\/strong><\/strong><\/td>TiO\u2082<\/strong><\/strong><\/td>NaCl<\/strong><\/strong><\/td><\/tr>
    Areia de quartzo<\/td>\u226598,5 \u00b10,3<\/td>\u22641,0 \u00b10,q<\/td>\u22640,01 \u00b10,001<\/td> <\/td> <\/td> <\/td>\u22640,1 \u00b10,01<\/td> <\/td><\/tr>
    Feldspato<\/td><70 \u00b10,6<\/td>\u226515 \u00b10,25<\/td><0,15 \u00b10,05<\/td> <\/td> <\/td> <\/td> <\/td> <\/td><\/tr>
    Dolomite<\/td> <\/td> <\/td> <\/td>\u226530 \u00b10,3<\/td>\u226520 \u00b10,3<\/td> <\/td> <\/td> <\/td><\/tr>
    Calc\u00e1rio<\/td> <\/td> <\/td>\u22640,018<\/td>\u226552<\/td> <\/td> <\/td> <\/td> <\/td><\/tr>
    Longarina pesada<\/td> <\/td> <\/td>\u22640,001<\/td> <\/td> <\/td>>99,0 \u00b10,1<\/td> <\/td><0,3<\/td><\/tr>
    Alumina<\/td>\u226563,5 \u00b10,1<\/td>\u22640,001<\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td><\/tr>
    Sal de Glauber (Na\u2082SO\u2084)<\/td> <\/td> <\/td>Fe\u2082O\u2083 \u22640,001<\/td> <\/td> <\/td>Na\u2082SO\u2084 \u226599 \u00b10,1<\/td> <\/td> <\/td><\/tr>
    Antimonato de s\u00f3dio (Na\u2083SbO\u2084)<\/td> <\/td> <\/td>Fe\u2082O\u2083 \u22640,055%<\/td> <\/td> <\/td>Sb\u2082O\u2085 \u226564%<\/td> <\/td> <\/td><\/tr>
    Tri\u00f3xido de antim\u00f4nio (Sb\u2082O\u2083)<\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td><\/tr>
    <\/td><\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Observa\u00e7\u00f5es: O padr\u00e3o utilizado \u00e9 o padr\u00e3o nacional de Sb\u2082O\u2083 de grau 0. O principal componente da mat\u00e9ria-prima \u00e9 \u226599,5%. O tamanho m\u00e9dio das part\u00edculas \u00e9 de 1,3\u20131,5 \u03bcm, o di\u00e2metro m\u00e9dio \u00e9 de 0,3\u20130,35 \u03bcm e o tamanho m\u00e1ximo das part\u00edculas \u00e9 controlado em at\u00e9 5 \u03bcm.<\/p>\n\n\n\n

    5. Vidro fotovoltaico (solar)<\/h2>\n\n\n\n

    Photovoltaic glass is installed as the outermost layer of solar modules. Its job is to protect solar cells and electrodes by blocking moisture and corrosive gases while letting maximum sunlight through. Compared to ordinary glass, PV glass must offer   lower iron content, higher light transmittance, impact resistance, corrosion resistance, and thermal stability.<\/p>\n\n\n\n

    Dois tipos de vidro atendem a essas demandas: vidro float ultratransparente e vidro laminado ultratransparente. O vidro laminado \u00e9 a escolha mais comum para c\u00e9lulas solares de sil\u00edcio cristalino, enquanto o vidro float \u00e9 mais utilizado em m\u00f3dulos solares de pel\u00edcula fina.<\/p>\n\n\n\n

    Iron ions in quartz sand can easily cause discoloration, which reduces solar transmittance. Therefore, PV glass requires quartz sand with high silica purity and very low impurity levels \u2013 specifically low-iron quartz sand. The industry standard   JC\/T 2314-2015 \u201cSiliceous Raw Materials for Photovoltaic Glass\u201d defines the relevant quality specifications.<\/p>\n\n\n\n

    Requisitos de qualidade para material de alumina-s\u00edlica<\/h3>\n\n\n\n
    Item\/Par\u00e2metro<\/strong><\/strong><\/td>Primeiro ano<\/strong><\/strong><\/td>Segundo ano<\/strong><\/strong><\/td><\/tr>
    SiO\u2082 \/ % \u2265<\/td>99.5<\/td>99.0<\/td><\/tr>
    Al\u2082O\u2083 \/ % \u2264<\/td>0.20<\/td>0.50<\/td><\/tr>
    TiO\u2082 \/ mg\/kg \u2264<\/td>10<\/td>20<\/td><\/tr>
    Fe\u2082O\u2083 \/ mg\/kg \u2264<\/td>60<\/td>80<\/td><\/tr>
    Cr\u2082O\u2083 \/ mg\/kg \u2264<\/td>2<\/td>5<\/td><\/tr>
    Res\u00edduo na peneira de 1,0 mm \/ %<\/td>0<\/td>0<\/td><\/tr>
    Res\u00edduo na peneira de 0,6 mm \/ % \u2264<\/td>1.5<\/td>1.5<\/td><\/tr>
    Res\u00edduo na peneira de 0,1 mm \/ % \u2264<\/td>5.0<\/td>5.0<\/td><\/tr>
    Absor\u00e7\u00e3o de \u00e1gua \/ % \u2264<\/td>5.0<\/td>5.0<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    6. Vidro de quartzo<\/h2>\n\n\n\n

    Quartz glass is the crown jewel of glass materials. It is a single-component SiO\u2082 glass boasting exceptional mechanical, thermal, optical, and electrical properties. It plays an irreplaceable role in semiconductors, optical devices, optical communications, and solar energy applications.<\/p>\n\n\n\n

    Today,   high-purity quartz sand has replaced natural crystal as the primary raw material   for melting quartz glass. Whether using electrical fusion or flame fusion processes, high-purity quartz sand is the indispensable starting material for producing quartz glass tubes, rods, and ingots.<\/p>\n\n\n\n

    Propriedades e caracter\u00edsticas<\/h3>\n\n\n\n
    N\u00e3o.<\/strong><\/strong><\/td>Propriedade<\/strong><\/strong><\/td>Caracter\u00edsticas \/ Funcionalidades<\/strong><\/strong><\/td><\/tr>
    \u2460<\/td>Boa transpar\u00eancia \u00f3ptica<\/td>Transmit\u00e2ncia extremamente alta nos espectros UV, vis\u00edvel e infravermelho: transmit\u00e2ncia UV >80%; transmit\u00e2ncia de luz vis\u00edvel >92%<\/td><\/tr>
    \u2461<\/td>Resist\u00eancia a altas temperaturas<\/td>Ponto de amolecimento: 1730 \u00b0C; Temperatura de uso prolongado: at\u00e9 1100 \u00b0C; Temperatura de uso de curto prazo: at\u00e9 1450 \u00b0C.<\/td><\/tr>
    \u2462<\/td>Resist\u00eancia \u00e0 corros\u00e3o<\/td>Resistente ao \u00e1cido fluor\u00eddrico e ao \u00e1cido fosf\u00f3rico quente; praticamente n\u00e3o reage com outros \u00e1cidos.<\/td><\/tr>
    \u2463<\/td>Capacidade de alto v\u00e1cuo<\/td>O v\u00e1cuo pode atingir 10\u207b\u2076 Pa<\/td><\/tr>
    \u2464<\/td>Excelente isolamento el\u00e9trico<\/td>Resistividade: 1,8\u00d710\u00b9\u2079 \u03a9\u00b7cm a 20 \u00b0C; 1,6\u00d710\u00b9\u2076 \u03a9\u00b7cm a 800 \u00b0C<\/td><\/tr>
    \u2465<\/td>Baixa expans\u00e3o t\u00e9rmica<\/td>Suporta varia\u00e7\u00f5es extremas de temperatura; cerca de 1\/20 da resist\u00eancia do vidro comum.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Com certeza! Aqui est\u00e3o suas duas tabelas formatadas de forma limpa em Markdown, prontas para serem copiadas diretamente para o seu site:<\/p>\n\n\n\n

    Tabela 5-1: Requisitos de elementos de impureza da areia de quartzo para vidro de quartzo<\/h3>\n\n\n\n
    Aplica\u00e7\u00e3o Industrial<\/strong><\/th>Origem<\/strong><\/th>Al (ppm)<\/strong><\/th>Fe (ppm)<\/strong><\/th>Ti (ppm)<\/strong><\/th>C\u00e1lcio (ppm)<\/strong><\/th>B (ppm)<\/strong><\/th>K (ppm)<\/strong><\/th>Na (ppm)<\/strong><\/th>Li (ppm)<\/strong><\/th><\/tr><\/thead>
    Fonte de luz el\u00e9trica<\/td>China<\/td>Total 50\u2013100 ppm<\/td>50\u2013100 <\/td>50\u2013100 <\/td>50\u2013100 <\/td>50\u2013100 <\/td>50\u2013100 <\/td>50\u2013100 <\/td>50\u2013100 <\/td><\/tr>
    <\/td><\/td><\/td><\/td><\/td><\/td><\/td><\/td><\/td><\/td><\/tr>
    Ind\u00fastria qu\u00edmica<\/td>Tcheco<\/td>42<\/td>3.0<\/td>3.0<\/td>8.0<\/td>\/<\/td>18.0<\/td>5.0<\/td>\/<\/td><\/tr>
    Semicondutor<\/td>China<\/td>20<\/td>0.18<\/td>0.5<\/td>0.1<\/td>0.1<\/td>0.2<\/td>4.0<\/td>1.8<\/td><\/tr>
    Semicondutor (de alta qualidade)<\/td>EUA<\/td>15<\/td>0.3<\/td>\/<\/td>0.4<\/td>0.1<\/td>0.7<\/td>0.9<\/td>0.7<\/td><\/tr>
    Semicondutor (de alta qualidade)<\/td>R\u00fassia<\/td>14<\/td>0.9<\/td>0.4<\/td>0.1<\/td>\/<\/td>0.3<\/td>0.6<\/td>\/<\/td><\/tr>
    Tubo de fibra \u00f3ptica<\/td>Brasil<\/td>11<\/td>1.8<\/td>0.4<\/td>0.1<\/td>\/<\/td>0.3<\/td>0.4<\/td>\/<\/td><\/tr>
    Lente \u00f3ptica<\/td>EUA<\/td>8<\/td>0.05<\/td>\/<\/td>0.7<\/td>0.04<\/td>0.05<\/td>0.05<\/td>0.2<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Observa\u00e7\u00e3o:<\/strong> C\u00e9lulas em branco indicam que n\u00e3o h\u00e1 limite especificado ou que os dados n\u00e3o est\u00e3o dispon\u00edveis.<\/p>\n\n\n\n

    Tabela 5-2: Requisitos de tamanho de part\u00edcula da areia de quartzo para vidro de quartzo<\/h3>\n\n\n\n
    Processo<\/strong><\/th>Forno de resist\u00eancia<\/strong><\/th>Forno de fus\u00e3o cont\u00ednua dom\u00e9stico<\/strong><\/th>Forno de fus\u00e3o cont\u00ednua estrangeiro<\/strong><\/th>Fus\u00e3o por chama de oxihidrog\u00eanio<\/strong><\/th>Plasma<\/strong><\/th><\/tr><\/thead>
    Tamanho das part\u00edculas (malha)<\/strong><\/td>40\u201380<\/td>60\u2013120<\/td>80\u2013140<\/td>80\u2013200<\/td>120\u201320<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Como escolher a areia de quartzo certa para sua aplica\u00e7\u00e3o em vidro.<\/h2>\n\n\n\n

    Desde o vidro plano padr\u00e3o at\u00e9 as exig\u00eancias rigorosas do vidro ultratransparente, fotovoltaico e de quartzo, a qualidade da areia de quartzo determina diretamente o desempenho, a efici\u00eancia e o custo do produto. Compreender os padr\u00f5es exatos \u2013 que abrangem pureza qu\u00edmica, teor de ferro e tamanho das part\u00edculas \u2013 \u00e9 o primeiro passo para produzir vidro de qualidade superior.<\/p>\n\n\n\n

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