Ecology and life history

Although most species live in inshore and estuarine waters, 29 species spend their entire life cycles in freshwater. These species are found in disjunct tropical regions of South America (one species), Central Africa (three species) and Southeast Asia (25 species). Natural defenses : A pufferfish pressing its mouth against a camera's lens at Big Island of Hawaii The puffer's unique and distinctive natural defenses help compensate for its...

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Aluminium

Aluminium ( /ˌæljuːˈmɪniəm/ al-ew-min-ee-əm) or aluminum (American English;  /əˈluːmɪnəm/ ə-loo-mi-nəm) is a chemical element in the boron group with symbol Al and atomic number 13. It is silvery white, and it is not soluble in water under normal circumstances. Aluminium is the third most abundant element (after oxygen and silicon), and the most abundant metal, in the Earth's crust. It makes up about 8% by weight of the Earth's solid surface. Aluminium metal is so chemically reactive that native specimens are rare and limited to extreme reducing...

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Cement

          In the most general sense of the word, a cement is a binder, a substance that sets and hardens independently, and can bind other materials together. The word "cement" traces to the Romans, who used the term opus caementicium to describe masonry resembling modern concrete that was made from crushed rock with burnt lime as binder. The volcanic ash and...

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Cement kiln

          Cement kilns are used for the pyroprocessing stage of manufacture of Portland and other types of hydraulic cement, in which calcium carbonatereacts with silica-bearing minerals to form a mixture of calcium silicates. Over a billion tonnes of cement are made per year, and cement kilns are the heart of this production process: their capacity usually define the...

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Building insulation

          Building insulation refers broadly to any object in a building used as insulation for any purpose. While the majority of insulation in buildings is forthermal purposes, the term also applies to acoustic insulation, fire insulation, and impact insulation (e.g. for vibrations caused by industrial applications). Often an insulation material will be chosen for its ability to...

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High-temperature material

         Silicon nitride has long been used in high-temperature applications. In particular, it was identified as one of the few monolithic ceramic materials capable of surviving the severe thermal shock and thermal gradients generated in hydrogen/oxygen rocket engines. To demonstrate this capability in a complex configuration, NASA scientists used advanced rapid prototyping technology to fabricate a one-inch-diameter,...

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Refractory

          A fire brick, firebrick, or refractory brick is a block of refractory ceramic material used in lining furnaces, kilns, fireboxes, and fireplaces. A refractory brick is built primarily to withstand high temperature, but will also usually have a low thermal conductivity for greater energy efficiency. Usually dense firebricks are used in applications with extreme mechanical, chemical, or thermal stresses, such as the inside of a wood-fired...

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Refractory metals

          Refractory metals are a class of metals that are extraordinarily resistant to heat and wear. The expression is mostly used in the context of materials science, metallurgy and engineering. The definition of which elements belong to this group differs. The most common definition includes five elements: two of the fifth period (niobium andmolybdenum) and three of the sixth period (tantalum, tungsten, and rhenium). They all share...

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Oil shale

Oil shale           Oil shale, also known as kerogen shale, is an organic-rich fine-grained sedimentary rock containing kerogen (a solid mixture of organic chemical compounds) from which liquid hydrocarbons called shale oil (not to be confused with tight oil—crude oil occurring naturally in shales) can be produced. Shale oil is a substitute for conventional...

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Refractory anchorage

          All refractory require anchorage systems such as wire formed anchors, formed metal (for example, hexmetal) or ceramic tiles to support the refractory linings. The anchorage used for refractory on roofs and vertical walls are more critical as they must remain able to support the weight of refractory even at the elevated temperatures and operating conditions.           The commonly used anchorages have circular or rectangular cross-section. Circular cross-section are used for low...

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Furnace

          A furnace is a device used for heating. The name derives from Latin fornax, oven. In American English and Canadian English, the term furnace on its own is generally used to describe household heating systems based on a central furnace (known either as a boiler or a heater in British English), and sometimes as a synonym...

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Plastic explosive

          Plastic explosive is a specialised form of explosive material. It is a soft and hand moldable solid material. Plastic explosives are properly known as putty explosives within the field of explosives engineering. Common plastic explosives include Semtex and C-4. Plastic explosives are especially suited for explosive demolition as they can be easily formed...

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Putty

          Putty is a generic term for a plastic material similar in texture to clay or dough typically used in domestic construction and repair as a sealant or filler.Painter's Putty is typically a linseed oil based product used for filling holes, minor cracks and defacements in wood only. Putties can also be madeintumescent, in which case they are used for firestopping as...

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Epoxy putty

          Epoxy putty is a room-temperature-hardening substance used as a space-filling adhesive. It is stored until use as two components of clay-like consistency. Kneading the two components into each other creates an exothermic chemical reaction that activates the substance for use by catalyzing an epoxide polymerisation reaction. Unlike many other types of glues, an epoxy adhesive can fill gaps and even be molded into a structural part. Some makers claim in advertising that one can...

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Adhesive

Adhesive           Adhesion is the tendency of dissimilar particles or surfaces to cling to one another (cohesion refers to the tendency of similar or identical particles/surfaces to cling to one another). The forces that cause adhesion and cohesion can be divided into several types. The intermolecular forces responsible for the function of various kinds of stickers and sticky tape fall into the categories...

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Hot-melt adhesive

Hot melt adhesive         Hot melt adhesive (HMA), also known as hot glue, is a form of thermoplastic adhesive that is commonly supplied in solid cylindrical sticks of various diameters, designed to be melted in an electric hot glue gun. The gun uses a continuous-duty heating element to melt the plastic glue, which may be pushed through the gun by a mechanical trigger mechanism, or directly by the user. The...

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High Temperature Insulation Wool

In the 1950s, the term “Refractory Ceramic Fibre” was coined for the aluminium silicate fibres developed at this time. On account of their chemical purity and resistance to high temperatures (classification temperature >1000 °C) as well as on the basis of their use in other applications, this definition was made to differentiate aluminium silicate wools from the conventional “mineral wools”. Because of the ambiguity of the term “ceramic” and the development of new materials for the high temperature range, the nomenclature was changed to High...

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REFRACTORY CASTABLES

REFRACTORY CASTABLESRefractory castables can be used to create the monolithic linings within all types of furnaces and kilns. They can be further classified into the following sub-categories: conventional, low iron, low cement, and insulating for installation either by gunning or manually. There is a wide variety of raw materials that refractory castables are derived from, including chamotte, andalusite, bauxite, mullite, corundum, tabular alumina,...

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Refractory Castable

คอนกรีตทนไฟ (อังกฤษ: Refractory Castable) เป็นวัสดุทนไฟประเภทหนึ่ง ที่มีลักษณะและวิธีการใช้งานคล้ายกับคอนกรีตที่ใช้ในงานก่อสร้าง แต่เนื้อวัสดุที่นำมาใช้ผลิตเป็นคอนกรีตทนไฟ จะเป็น Refractory Material ซึ่งรวมถึง เม็ดวัตถุดิบหยาบ (Aggregate) และ สารประสาน (Binder) ซึ่งมักจะเป็น High Alumina Cement[แก้]ประเภทของคอนกรีตทนไฟคอนกรีตทนไฟ สามารถแบ่งเป็นประเภทได้โดยเกณฑ์ที่แตกต่างกัน เช่น1.แบ่งตามปริมาณ แคลเซียมออกไซด์ (CaO) ที่เป็นองค์ประกอบในเนื้อผลิตภัณฑ์ ได้ดังนี้ 1.Conventional Castable เป็นคอนกรีตทนไฟ ที่มีปริมาณองค์ประกอบ CaO อยู่ในปริมาณสูง กว่า...

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Reractory Castable

Product Category : Material Handling Components Reractory Castable Top & Bottom Blocks is used to hold the induction coil tightly in middle of the tilting furnace box with help of vertical tie rods. Thermafield Power Components Private Limited manufactures Reractory Castable Top & Bottom Blocks. Thermafield Power Components Private Limited supplies different types of induction furnace insulating materials, coil supports and non asbestose sheets, induction furnace hydraulic spares, carbon free hoses, hydraulic cylinders, he plates, duraline...

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Silicon Nitride Product

casatables are extensively used for back-up and hot face linings.Their low density and low thermal conductivity helps in conserving heat energy and reducing fuel costs.These are low iron content insulating castables, suitable for use in reducing atmospherewith higher strengths coupled with the advantage of low thermal conductiviti...

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