[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-502127-105":59,"doc-detail-502127-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","glass-lect-mais-abdul-rahman-4-glass-processing-41-introduction","GLASS - Lect. Mais Abdul Rahman - 4-Glass processing - 4.1 Introduction","","Engineering Materials Department lecture notes on glass processing, focusing on how most glasses are produced by melting batch components at elevated temperatures. It describes selection of raw materials, calculation of batch proportions, heating-related chemical and physical changes, conversion to a homogeneous melt, and further processing to remove unmelted remnants, impurities, and bubbles. It outlines requirements for shaping and heat treatments to relieve stresses or achieve thermal tempering, and begins sectioned preparation of glass batches.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/glass-lect-mais-abdul-rahman-4-glass-processing-41-introduction/502127/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/glass-lect-mais-abdul-rahman-4-glass-processing-41-introduction/502127.png","ImageObject",300,407,{"name":92,"@type":93},"Muffet","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-22","2026-10-03",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"How are most glasses produced according to the lecture?","Question",{"text":112,"@type":113},"Most glasses are produced by melting batch components at elevated temperatures, involving selection of raw materials, proportion calculations, and weighing and mixing to form a homogeneous starting material.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What happens to batch materials during initial heating?",{"text":117,"@type":113},"Raw materials undergo chemical and physical changes to produce a melt, and further processing may be needed to remove unmelted remnants, impurities, and bubbles and obtain a homogeneous liquid.",{"name":119,"@type":110,"acceptedAnswer":120},"What five categories are batch materials divided into by their role?",{"text":121,"@type":113},"Batch materials can be divided into glass formers, fluxes, property modifiers, colorants, and fining agents; compounds may shift categories depending on the purpose.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},502127,1792215769,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},962090768927,"https://ap-avatar.wpscdn.com/davatar_085a072bc5b1113ac321206ff7593b45","Collage of Engineering Materials Department  \nThird Class  \nLecture (3)/ Course 1  \nGLASS  \nLect. Mais Abdul Rahman  \n4-Glass processing  \n4. 1 INTRODUCTION1  \nAlthough glasses can be made by a wide variety of methods, the vast majority are still produced by melting of batch components atan elevated temperature. This procedure always involves the selection of raw materials, calculation of the relative proportions of each to use in the batch, and weighing and mixing these materials to provide a homogeneous starting material. During the initial heating process, these raw materials undergo a series of chemical and physical changes to produce the melt. Conversion of this melt to a homogeneous liquid may require further processing, includingthe removal of any unmelted batch remnants, impurities, and bubbles. Production of commercial products requires forming of specific shapes, as well as heat treatments to remove stresses generated during the cooling process, or to produce glasses strengthened by thermal tempering shown in flowchart figure (4.1) below:  \nFigure (4.1) Manufacturing of glass  \n4.2 Preparation of Glasses  \n4.2.1 Preparation of Raw materials:  \nIn general, glasses are either produced from high quality, chemicallypure components, or from a mixture of far less pure minerals. Regardless of the source of the components used to  \nproduce a specific glass, the batch materials can be divided into five categories on the basis of their role in the process:  \n-A-Glass formers  \n-B-Fluxes  \n-C-Property modifiers  \n-D-Colorants  \n-E-Fining agents  \nThe same compound may be classed into different categories when used for different purposes. Alumina, for example, serves as a glass former in aluminate glasses, but is considered a property modifier in most silicate glasses. Arsenic oxide may be either a glass former or a fining agent, depending upon the purpose for which it has been added to the batch. The most essential component of any glass batch is always the glass former. Every glass contains one or more components which serve Glass Melting 29 as the primary source of the structure. While these components are commonly designated as glass formers, they are also called network formers or glass forming oxides in many oxide glasses. The identity of these components usually serves as the basis for the generic name used for the glass. If most of the glass former present  \nin a specific sample is silica, for example, that glass is called a silicate. If a significant amount of boric oxide is also present, in addition to silica, the sample is termed a borosilicate glass. The primary glassformers in commercial oxide glasses are silica (SiO2), boric oxide (B2O3), and phosphoric oxide (P2O5), which all readily form single component glasses. A large number of other compounds may act as glassformers under certain circumstances, including GeO2 , Bi2O3 , As2O3 , Sb2O3 , TeO2 , A12O3 , Ga2O3 , and V2O5. With the exception of GeO2 , these oxides do not readily form glasses by themselves unless very rapidly quenched or vapor deposited, but can serve as glass formers when mixed with other oxides. Although halide glasses can be made in many systems, with many different compounds acting as glass formers, the two most common halide glass formers are BeF2 and ZrF4. .  \n-B-Fluxes are used mainly to reduce the processing temperatures to within practical limits .silica forms an excellent glass with a wide range of applications. The use of pure silica glass for bottles, windows, and other bulk commercial applications would be expensive, due to the high melting temperature (> 2000 ᵒC) required to produce vitreous silica. Therefore sodium oxide Na2Ois added to the silica to reduce the melting temperature to around 1600 ᵒC. The most common fluxes are the alkali oxides, especially  \nNa2O (soda) and PbO. Most commercial glasses contain soda, including those used for containers and window glasses. Potassium oxide is also used extensively in commercial glasses, w","cbCais1nVg0wxODx","https://ap.wps.com/l/cbCais1nVg0wxODx","pdf",661417,11,"English","# 4-Glass processing\n## 4.1 INTRODUCTION\n## 4.2 Preparation of Glasses\n### 4.2.1 Preparation of Raw materials","[{\"question\":\"How are most glasses produced according to the lecture?\",\"answer\":\"Most glasses are produced by melting batch components at elevated temperatures, involving selection of raw materials, proportion calculations, and weighing and mixing to form a homogeneous starting material.\"},{\"question\":\"What happens to batch materials during initial heating?\",\"answer\":\"Raw materials undergo chemical and physical changes to produce a melt, and further processing may be needed to remove unmelted remnants, impurities, and bubbles and obtain a homogeneous liquid.\"},{\"question\":\"What five categories are batch materials divided into by their role?\",\"answer\":\"Batch materials can be divided into glass formers, fluxes, property modifiers, colorants, and fining agents; compounds may shift categories depending on the purpose.\"}]","GLASS - Lect. Mais Abdul Rahman - 4-Glass processing - 4.1 Introduction | PDF",1791029464,28]