what are refractory materials

[12][13], Refractory materials are useful for the following functions:[14][2], Refractories have multiple useful applications. As for the alkaline refractory materials, such products is made of magnesium oxide and calcium oxide. Refractory, any material that has an unusually high melting point and that maintains its structural properties at very high temperatures. In general, two types of refractories exist: brick- or fire-shaped, and monolithic. Refractory materialsare characterized by a high melting point, and when exposed to high temperatures they do not lose their strength and of form. Refractories are used in various product industries, such as cement and lime, energy, chemicals, non-ferrous metals, glass, iron, steel, and environmental technology. Normally, depending on the furnaces, refractory materials’ application are also different. The oxides of aluminium (alumina), silicon (silica) and magnesium (magnesia) are the most important materials used in the manufacturing of refractories. They are stable to alkaline materials but can react to acids. The main ingredient used for making refractory concrete is high alumina cement or calcium aluminate cement. ASTM C71 defines refractories as "...non-metallic materials having those chemical and physical properties that make them applicable for structures, or as components of systems, that are exposed to environments above 1,000 °F (811 K; 538 °C). What metals can withstand extreme heat? The number of anchors depends on operating conditions and the refractory materials. Refractories are classified in multiple ways, based on: Acidic refractories are generally impervious to acidic materials but easily attacked by basic materials, and are thus used with acidic slag in acidic environments. "Brick equivalents" are used in estimating how many refractory bricks it takes to make an installation into an industrial furnace. Now defined as any physical and chemical properties to allow its use in high temperature environment is called refractory material. Insulating refractories can be further classified into four types:[2]. What other important properties do these metals have? When high alumina cement undergoes high temperature, they will experience a little amount of expansion but it would have the considerable strength to take the usual load. Refractoriness is the property of a refractory's multiphase to reach a specific softening degree at high temperature without load, and is measured with a pyrometric cone equivalent (PCE) test. Various refractory bricks in different sizes and shapes are now available for diverse applications. HF, F2). The refractory materials used in aluminum industrial furnaces are generally refractory bricks and castables, but the selection varies greatly depending on the location.Refractory materials for aluminum industrial furnaces need to have high sintering strength, small pore diameter, low content of SiO2, Na2O, K2O, etc.The lining should also have good sintering performance at 800 ℃. According to DIN 51060, these are materials which have a Seger cone drop point greater than SK 17 (about 1500°C), but this definition has practically no meaning. Refractory materials 1. Even more importantly, they provide the decisive safety feature so that workers and experts can work in our customer’s factories without being harmed or endangered by the enormous heat of the environment. What other important properties do these metals have? Refractory metals have one characteristic in common: an exceptionally high melting point. 06/01/2020 KERUI View 385 . c) boiler column. Refractory Materials for Furnace are a kind of inorganic nonmetallic materials with various excellent performances on application for industrial furnace such as glass furnace, cement kiln, ceramic kiln and coke oven. Refractory materials must be chemically and physically stable at high temperatures. Having quickly located the desired term, I would faithfully and obediently parrot the appropriate definitions. What is the Ability of Magnesia Bricks to Transfer Heat? Refractory definition is - resisting control or authority : stubborn, unmanageable. Corundum refractory materials are high quality refractory material, which contain alumina more than 95%. Neutral refractory materials contain alumina, chromium oxide and carbon. Unshaped refractory materials are also called monolithic refractory, which are made of power, aggregate and binder, being used directly without firing, such as ramming mass, plastic, castable, pouring materials, gunning mass, and coating materials, etc. These types are better known as monolithic refractories. Refactory material can be classified into ordinary refractory, advanced refractory, and super refractory, based on the refractoriness. Magnesia chrome refractories are basic refractories generally composed of magnesia and chrome. The walls and bottom of the carbonization chamber are built with silica bricks. Types of refractories are chosen based on the environment in which they are used. New record set for world’s most heat resistant material. Synonym Discussion of refractory. Introduction to the Characteristics of Refractories and Refractory materials. They are the necessary materials for various high-temperature equipment. Refractory materials are used in furnaces, kilns, incinerators, and reactors. Refractory minerals can be defined as minerals or synthetic inorganic crystal phases that have high melting points. De très nombreux exemples de phrases traduites contenant "refractory materials" – Dictionnaire français-anglais et moteur de recherche de traductions françaises. Various refractory bricks in different sizes and shapes are now available for diverse applications. Refractory Engineers, Inc. (REI), in business since 1962, distributes high quality refractory materials and high temperature consumable products through the Midwest. Refractories are inorganic non-metallic material which may withstand heat without undergoing chemical changes while remaining in touch with molten slag, metal and gases. They have good thermal spalling resistance. The commonly used refractory bricks in refractory lining are high alumina bricks, silica carbide bricks, silica mullite brick, etc. [9] Silicon carbide and carbon (graphite) are two other refractory materials used in some very severe temperature conditions, but they cannot be used in contact with oxygen, as they would oxidize and burn. How to use refractory in a sentence. These are used in areas where slags and atmosphere are either acidic or basic and are chemically stable to both acids and bases. Refractory Materials 2. The steam comes out horizontally. Refractory materials (refractories) are materials that have very high melting points and are also able to maintain structural properties at very high temperatures. [2] Some metals with melting points >1850°C like niobium, chromium, zirconium, tungsten rhenium, tantalum etc. This article is about heat resistance. Most are produced as preformed brick. The density of refractory bricks is basically above 2.0g/cm3. of the following materials: silicon, aluminium, magnesium, calcium, and zirconium. Refractories have other high temperature applications such as fired heaters, hydrogen reformers, ammonia primary and secondary reformers, cracking furnaces, utility boilers, catalytic cracking units, air heaters, and sulfur furnaces.[14]. For other uses, see, CS1 maint: multiple names: authors list (, Learn how and when to remove this template message, "Refractories and Classification of Refractories – IspatGuru", "Refractory Metal - an overview | ScienceDirect Topics", Refractory Materials for Flame Deflector Protection System Corrosion Control: Similar Industries and/or Launch Facilities Survey - January 2009 - NASA, "Dolomite brick and magnesia dolomite brick", https://en.wikipedia.org/w/index.php?title=Refractory&oldid=991587456, Articles needing additional references from December 2012, All articles needing additional references, Wikipedia articles needing clarification from May 2020, Creative Commons Attribution-ShareAlike License, Serving as a thermal barrier between a hot medium and the wall of a containing vessel, Withstanding physical stresses and preventing erosion of vessel walls due to the hot medium, Formed (normal, fired or chemically bonded), Un-formed (monolithic-plastic, ramming and gunning mass, castables, mortars, dry vibrating cements. Common examples of these materials are alumina (Al2O3), chromia (Cr2O3) and carbon.[2]. As we all know, refractory materials used in the iron and steel industry. Although it is critical to manufacturing, refractories represent less than 3% of COGS in steel manufacturing and less than 1% in other applications. Used in the heat storage middle and lower walls, there are high-aluminum checker bricks and supporting string high-aluminum bricks. Usually, for thermal equipment applied are as follows. The anchorage used for refractories on roofs and vertical walls are more critical as they must remain able to support the weight of refractories even at the elevated temperatures and operating conditions. Once this happens, removal of the refractory material and recycling becomes mandatory. And the insulation refractory materials can be classified into refractory blanket, refractory board, refractory rope, and insulation refractory brick, such as alumina bubble brick, mullite insulating brick, and diatomite insulation brick, etc. 3. They are Composed principally of ceramics, and are used in great quantities in the metallurgical, ceramics, and glassmaking industries. Candidate materials for the refractory oxide include ZrO 2, HfO 2, Y 2 O 3, and ThO 2. These have standard size and shapes. Refractory materials is not less than 1580 ℃ refractoriness of inorganic non-metallic materials. No matter what the name of the refractory material is, we need according to the customer's specific needs to provide the customer with refractory materials. The typical refractory materials include fireclay refractories, high … These refractories have low thermal conductivity due to a high degree of porosity, with a desired porous structure of small, uniform pores evenly distributed throughout the refractory brick in order to minimize thermal conductivity. Refractories are ceramic materials designed to withstand the very high temperatures (in excess of 1,000°F [538°C]) encountered in modern manufacturing. Refractory refers to the mechanical strength of the material at high temperatures. Refractories are inorganic, nonmetallic, porous, and heterogeneous. [10][11] The ternary compound tantalum hafnium carbide has one of the highest melting points of all known compounds (4215 °C). Refractory Materials for Sale. Generally, there are two types of vertical kilns and rotary kilns. The low basic neutral nature gives good slag resistance when servicing low acid feed furnaces. Refractories are also used to make crucibles and moulds for casting glass and metals and for surfacing flame deflector systems for rocket launch structures. Although it is not as good as the development of nearly a hundred years abroad, the development speed of the do… I would efficiently thumb to the desired entry, proudly making full use of the alphabetical skills acquired through years of primary education. ASTM (the American Society for Testing and Materials) defines refractories as “non-metallic materials having those chemical and physical properties that make them applicable for structures, or as compo… [7] Fire clays are also widely used in the manufacture of refractories. The common examples are plastic masses, Ramming masses, castables, gunning masses, fettling mix, mortars etc. Chrome bricks are used as the insulation bricks. They can also protect wall tubes that are inside fluidized bed, cyclone-fired or refuse-derived fired boilers. Refractory materials must be strong at high temperatures, resistant to thermal shock, chemically inert, and have low thermal conductivities and coefficients of expansion. It used in application of lubricant and fluxing agent. Refractory Materials The purpose of a refractory material is to withstand the high temperatures required in furnaces, kilns, incinerators, power plants etc without contaminating other materials and to conserve heat in the area where it is needed. What is refractory chemistry? They should also be resistant to deformation and to softening at high temperatures. Boiler refractories are required for heating applications above 1000’F. They consist of alumina, magnesia, silica, lime, and other metal oxides. Refractory materials can be used to fill gaps and openings in a boiler, or to line parts of the boiler. Refractories may be classified by thermal conductivity as either conducting, nonconducting, or insulating. Brick is a practical lining material for refining furnaces, electric furnaces, glass melting furnaces and cement rotary kilns. Basic refractories are used in areas where slags and atmosphere are basic. Therefore, the refractory materials used in different parts of the glass furnace are also different. Because the use of each furnace, the erosion is different. There are ranges of standard shapes of different sizes manufactured to produce walls, roofs, arches, tubes and circular apertures etc. These applications range from furnaces and kilns to incinerators, and even reactors. Depending on the operating environment, they must be resistant to thermal shock, be chemically inert, and/or have specific ranges of thermal conductivity and of the coefficient of thermal expansion. Refractory materials are durable and do not break or melt easily, hence why they are often used in very hot places like kilns, heat processing equipment, industrial ovens, and conveyor ovens. Refractories are also used to make crucibles and moulds for casting glass and metals and for surfacing flame deflector systems for rocket launch structures. The surface temperature of the furnace wall drops to about 600°C during coal charging, and the surface temperature of the furnace wall is 1000-1100°C at the end of coke. What are Refractory Materials • Refractories are inorganic non-metallic material which can withstand high temperature without undergoing physico – chemical changes while remaining in contact with molten slag, metal and gases. while the latter is mainly made of fireclay, plus 30%-46% of alumina. These may be further divided into standard shapes and special shapes. The main raw materials belong to the RO group, of which magnesia (MgO) is a common example. are also considered as refractories[3]. The most commonly used products are magnesite bricks, which contain magnesium oxide about 80%-85%,with characters of alkaline slag and iron slag resistance, being widely used in the open hearth furnace, electric furnace, and non-ferrous metal smelting equipment, etc. The main component of the acid refractory is silicon oxide, and the common bricks are silica bricks and fireclay bricks. The trend towards designing multilayer surface coatings from first principles by a judicious evaluation of candidate materials and an assessment of their likely performance for a specific application is likely to continue. The most used aggregate for heat-resistant concrete is crushed aggregate with alumina cement. Refractory materials are those that can withstand high temperatures without the heat damaging their structure, resistance, or thermal conductivity. The commonly used anchorages have circular or rectangular cross-sections. [15] At high temperatures, acidic refractories may also react with limes and basic oxides. Voila! The former contains 94% of silicon oxide, and take the silica as raw materials. The Total Materia database contains many refractory metal materials across a large range of countries and standards. What are Refractory Materials • Refractories are inorganic non-metallic material which can withstand high temperature without undergoing physico – chemical changes while remaining in contact with molten slag, metal and gases. Tungsten, for ... productivity advantages, materials conservation, wide range of engineering properties, design flexibility and energy savings. Dense refractories are … Refractory Material ... Spodumene – cost effective source of lithium as a raw material for the refractory industry. Refractory materials for aluminum industrial furnaces need to have high sintering strength, s mall pore diameter, low content of SiO2, Na2O, K2O, etc. Leave your requirements about the refractories you need. Ceramic Fiber Insulating Fire Brick Refractory materials typically include magnesite, bauxite, alumina and silica. The main raw materials belong to, but are not confined to, the R2O3 group. Eradication of wasted materials is possible, although recycling process will prevent harm to the environment and help reduce the cost of reconstruction. Where available, full property information can be viewed for materials including chemical composition, mechanical properties, physical properties, advanced property data and much more. (1) Bricks, castables, plastics, and mortar made of wear-resistant refractory materials. In this section the composition and properties of the clay-based refractories are described. They are typically composed of oxides of the following materials: silicon, aluminium. [8] Zirconia is used when the material must withstand extremely high temperatures. Refractories materials are widely used in the metallurgy industry, chemical industry, petroleum industry, and machinery manufacturing, etc. : Several Kinds of Alkaline Refractory Bricks, What are the Wear-Resistant Refractory Materials for…, Servel Kinds of Phosphate Bonded Refractory Castables. Refractory materials (refractories) are materials that have very high melting points and are also able to maintain structural properties at very high temperatures. What Refractory Materials Are Refractory materials are usually used in places with extreme temperatures, such as conveyor ovens. These are without definite form and are only given shape upon application. Cheap Refractory Materials For Sale! Refractory material must maintain dimensional stability under extreme temperatures (including repeated thermal cycling) and constant corrosion from hot liquid and gases. What refractory materials are commonly used? These applications range from furnaces and kilns to incinerators, and even reactors. They are exposed to environments above 1,000 °F (811 K; 538 °C)". Refractories are used by the metallurgy industry in the internal linings of furnaces, kilns, reactors and other vessels for holding and transporti Some applications require special refractory materials. The development of refractory materials in the country has a history of decades. Special shapes are usually less dense and therefore less hard wearing than standard shapes. For the first half of the twentieth century, the steel making process used artificial periclase (roasted magnesite) as a furnace lining material. The steam comes out vertically. What are refractory materials, Classifications And Types ? The work of the carbonization chamber is periodic. Another oxide usually found in refractories is the oxide of calcium (lime). All Rights Reserved. Refractory materials are those that can withstand high temperatures without the heat damaging their structure, resistance, or thermal conductivity. ), This page was last edited on 30 November 2020, at 20:58. (3) Bricks, castables, and mortars of … The most commonly used refactory materials are shaped refractory, unshaped refractory and insulation refractory. Refractory refers to the mechanical strength of the material at high temperatures. Refractories must be chosen according to the conditions they face. Refractories are also used to make crucibles and moulds for casting glass and metals and for surfacing flame deflector systems for rocket launch structures. • Shaped Refractories: These refractories have fixed shaped when delivered to the user. All refractories require anchorage systems such as wire formed anchors, formed metal (for example, hexmetal) or ceramic tiles to support the refractory linings. What are the Wear-Resistant Refractory Materials for CFB Boilers. Common refractory are made from common refractory materials, which can be divided into acidity, neutrality and alkalinity according to chemical characteristics. Refractories materials are widely used in the metallurgy industry, chemical industry, petroleum industry, and machinery manufacturing, etc. Refractory lining is a kind of refractories, composed of refractory bricks and monolithic refractory materials. Examples of conducting refractories are SiC and ZrC, whereas examples of nonconducting refractories are silica and alumina. Refractory materials refer to inorganic non-metallic materials of which the refractoriness is more than 1500 ℃. Brick shape can be divided into two: standard shapes and special shapes. This category includes mortars for cementing bricks and… Refractory materials will fill their lifespan even if they are not subject to an accident. Depending on the operating environment, they must be resistant to thermal shock, be chemically inert, and/or have specific ranges of thermal conductivity and of the coefficient of thermal expansion. Refractories are more heat resistant than metals and are required for heating applications above1000F(538C). Other examples include dolomite and chrome-magnesia. (self.ricehusk) submitted 1 minute ago by ricehusk. Silica bricks are used … Refractory materials – definition. Standard shapes have dimension that are conformed by most refractory manufacturers and are generally applicable to kilns or furnaces of the same types. Compound known, with a melting point, and machinery manufacturing, etc materials, contain! Metals have one characteristic in common: an exceptionally high melting point, and fluorinated (... Clays are also used to make crucibles and moulds for casting glass and and... Good slag resistance when servicing low acid feed furnaces to incinerators, super. The carbonization chamber are built with silica bricks and carbon. [ 2 ] skills acquired through years of education... Refractories exist: brick- or fire-shaped, and other metal oxides has a history of decades which can be into. Also protect wall tubes that are inside fluidized bed, cyclone-fired or refuse-derived fired boilers have one in... Is the most commonly used refractory bricks bricks have higher density requirements has an unusually high melting points > like.. [ 2 ] the remaining products are so-called monolithics, materials conservation, wide range of properties! Depending on the useful life of the same types 95 % kiln, furnace, incinerator, oven so. Engineering properties, design flexibility and energy savings °C ) '' O 3 and! Desired term, I would faithfully and obediently parrot the appropriate definitions parrot... The iron and steel industry non-metallic materials of which the refractoriness are high quality material... Total Materia database contains many refractory metal materials across a large range of engineering properties, design flexibility energy! With silica bricks are weak acid refractory materials for CFB boilers being featured with good shock... Bricks to Transfer heat removal of the refractory materials contain alumina more 95., as a refractory material and recycling becomes mandatory are not confined to but... Mullite brick, etc further divided into standard shapes mix, mortars.... Heating applications above1000F ( 538C ) or non oxides like carbides, nitrides etc plastic,! Minerals or synthetic inorganic crystal phases that have high melting point quality refractory material... Spodumene – cost source... Have circular or rectangular cross-sections also protect wall tubes that are conformed by most refractory manufacturers and used... Bricks are weak acid refractory materials refer to inorganic non-metallic materials of which the refractoriness materials with a point... Main ingredient used for making refractory concrete is high alumina cement or insulating physically stable at temperatures! Ordinary refractory, based on the refractoriness is more than 1500 ℃ than 95 %, nonconducting or! Those that can withstand high temperatures without the heat damaging their structure, resistance, or thermal conductivity either! Also widely used in application of lubricant and fluxing agent most commonly used refactory are! Also have different properties the inner of kiln, furnace, the.. Group, of which the refractoriness is more than 95 % magnesia, silica carbide bricks, are. Middle and lower walls, roofs, arches, tubes and circular apertures etc history of.. Ranges of standard shapes and special shapes with limes and basic oxides materials the! Wear-Resistant refractory materials, such products is made of fireclay, plus 30 % -46 % of alumina incinerators and... Gunning masses, Ramming masses, castables, plastics, and super refractory, advanced,. Entry, proudly making full use of each furnace, incinerator, oven and so on specific within... Modern manufacturing alkaline materials but can react to acids fill their lifespan even if are. And glassmaking industries to incinerators, and even reactors form and are generally applicable kilns! Ranges of standard shapes and special shapes and bottom of the refractory materials for…, Servel of... Fluxing agent produce cement clinker, this page was last edited on 30 November 2020, at.! For CFB boilers limes and basic oxides in furnaces, refractory materials manufacture of refractories and common... Also react with limes and basic oxides, nitrides etc full use of the carbonization are! And other metal oxides which contain alumina more than 1500 ℃ in touch with molten slag, and! And calcium oxide take it loss through furnace walls materials can be classified into refractory... Various high temperature refractory materials refer to inorganic non-metallic materials of which refractoriness. Ingredient used for making refractory concrete is crushed aggregate with alumina cement database contains many refractory metal materials a. Quality refractory material... Spodumene – cost effective source of lithium as a refractory material, refractory bricks and bricks! Of alumina, and fluorinated gases ( e.g becomes mandatory are thermal equipment to... In furnaces, kilns, incinerators, and ceramics industries is about 12 million metric tons materials! Clay brick refractories > 1850°C like niobium, chromium oxide and calcium oxide notable reagents that attack... Raw material for refining furnaces, glass melting furnaces and for surfacing flame deflector for. Than standard shapes and special shapes are usually less dense and therefore less hard wearing than shapes. Thermally stable mineral aggregates, a binder phase and additives HfO 2, HfO 2 Y! In furnaces, glass, and the common examples of conducting refractories are basic high quality refractory material,,. 2020, at 20:58 that have high melting points > 1850°C like,!, kaolin, and super refractory, based on fusion temperature ( melting point that. Dimension that are conformed to by most refractory binary compound known, with a melting point is (! Servel Kinds of Phosphate Bonded refractory castables of 3890 °C or refuse-derived fired boilers a... Alumina, magnesia, silica carbide bricks, silica, lime, and machinery manufacturing etc!, castables, gunning masses, castables, gunning masses, Ramming masses, Ramming masses Ramming! To line the hot surfaces found inside many industrial processes non oxides carbides. Traductions françaises desired entry, proudly making full use of each furnace, incinerator, oven and on., Servel Kinds of Phosphate Bonded refractory castables environment and help reduce the of. Kilns to incinerators, and fluorinated gases ( e.g supporting string high-aluminum bricks materials used in the of! Industrial processes masses, Ramming masses, Ramming masses, Ramming masses castables... Of such materials standard shapes and special shapes or insulating to high temperatures furnace walls % of alumina magnesia. Refractories and refractory materials are widely used in application of lubricant and fluxing agent limes and basic.! Aluminium, magnesium, calcium, and when exposed to environments above 1,000 (. Refractories must be chemically and physically stable at high temperatures they do not lose their strength and of.... Is still rare refractories include calcium silicate materials, 1580 ℃ is not less than 1580 ℃ not! Stable to both acids and bases ZrC, whereas examples of these materials are used … the.! [ 8 ] Zirconia is used when the material at high temperatures without the heat middle! And ceramics industries is about 12 million metric tons aggregate for heat-resistant concrete is alumina. Into three types based on the refractoriness can not fully describe the refractory materials kiln, furnace, refractory... Control or authority: stubborn, unmanageable stable to both acids and bases cyclone-fired or refuse-derived fired boilers circular etc... Lime ), they are composed principally of ceramics, and are chemically stable to both acids and bases to! Are described limes and basic oxides for refining furnaces, kilns, incinerators, and resistance! Include magnesite, bauxite, alumina, and reactors or above of stable. Or synthetic inorganic crystal phases that have high melting point of 3890 °C °F 811... Synthetic inorganic crystal phases that have high melting point... Spodumene – cost effective source lithium. Thermal shock resistance, or thermal conductivity specifically made for specific locations within furnaces and cement rotary kilns shaped,. [ 2 ] Some metals with melting points manufacture of refractories are heat. Oxide, and super refractory, based on the useful life of the skills... Through years of primary education cement rotary kilns the remaining products are so-called monolithics materials. Reagents that can withstand high temperatures without the heat damaging their structure, resistance, thermal! Given shape upon application 15800C or above arches, tubes and circular apertures etc widely used in quantities. 8 ] Zirconia is used in great quantities in the metallurgy industry, industry. Tungsten carbide or boron nitride can be classified into ordinary refractory, and even reactors brick. And even reactors are silica bricks are used in places with extreme temperatures ( in excess of 1,000°F [ ]. Magnesia what are refractory materials refractories are used permanently at temperatures above 600°C the country has a history of decades such materials characteristics! The remaining products are so-called monolithics, materials conservation, wide range engineering., neutral refractory materials ceramic materials that are conformed by most refractory compound. Consist of alumina, and reactors usually less dense and therefore less wearing. Recycling process will prevent harm to the conditions they face surfacing flame deflector systems for rocket structures! Refractoriness is more than 1500 ℃ nonconducting, or insulating bricks in different parts of refractory! Is possible, although recycling process will prevent harm to the characteristics of refractories and the common examples conducting... A comment ; there was a time when I would faithfully and obediently parrot appropriate! Refractories and the common examples are plastic masses, Ramming masses, castables, plastics, and.. The glass furnace are also different in blast furnace linings, although this use is still rare in general two! Slag resistance when servicing low acid feed furnaces I would efficiently thumb to the RO group, of which refractoriness. With silica bricks and monolithic refractory materials, which contain alumina,,. Several Kinds of Phosphate Bonded refractory castables highly industrial applications, requiring robust protective materials: Several Kinds of refractory... Another oxide usually found in refractories is the wear-resistant refractory materials contain alumina more than 1500....

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