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  • Retsch : Home : Aplicaciones : Química / Plásticos
    is described using a remote controlled toy car as an example Cadmium as a color pigment in plastics lead in solder or polybrominated biphenyls PBB as flame protection in cables the list of sources of potential hazardous substances in the electrical and electronics industries is long Since the implemented EU Directives RoHS and WEEE came into force in July 2006 the manufacturing processing and recycling companies in this sector have

    Original URL path: http://www.retsch.es/es/aplicaciones/quimica-plasticos/dl_details/1/file/53e4b559-bca0-4be3-9d8f-636500000000/ (2015-09-25)
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  • Retsch : Home : Aplicaciones : Química / Plásticos
    electrical and electronic appliances as well as the restricted use of certain hazardous substances in these devices have become effective All EU countries have to adopt these directives through national legislation which will not only affect EU members but also countries which export their products to Europe In other parts of the world e g California and China these directives have also been transformed into national regulations The aim of the Waste of Electrical and Electronic Equipment WEEE directive is the environmentally acceptable disposal of used electrical appliances some of which contain hazardous components which are increasingly being found in household waste Among these are electric irons food processors electric shavers toasters and electric tools that have a low recycling quota The objective of WEEE is that the total amount of materials which are not suitable for substantial or thermal recycling should be strongly limited and that the recycling quota should amount to 75 by the end of this year A further directive Restriction of Hazardous Substances RoHS on limitations of use stipulates that from July 2006 the amount of certain substances such as lead mercury cadmium and brominated flameproofing agents in new electric and electronic appliances must not exceed

    Original URL path: http://www.retsch.es/es/aplicaciones/quimica-plasticos/dl_details/1/file/53e4b558-46ac-4993-93c3-636500000000/ (2015-09-25)
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    vidrio Medicina farmacia Mineralogía metalurgia Analytical Methods AAS NIR XRF Home Aplicaciones Química Plásticos Química Plásticos Consistent Milling on a Nano Scale Descargar PDF Haga una selección pdf Inglés 381 KB Planetary ball mills are helping scientists and engineers advance nanotechnology by providing a consistent way to produce nanoscale powders Colloid and chemical scientists have been studying nanoparticles extremely fine particles of less than 1 micron in diameter for many years but recently these tiny particles have been receiving increased attention in a variety of fields As particles become smaller their properties can change in mysterious and useful ways This change in properties is often due to the increased reactivity of nanoparticles and their consequent desire to quickly bond with anything close to them Unfortunately this includes a tendency to bond with their own kind which is one of the many challenges of making and working with these little fellows However once these challenges are overcome the potential benefits in fields ranging from cancer treatment and food to environmental remediation ceramics and numerous others are virtually endless Before working with nanoparticles it is first necessary to be able to produce them Volver Suscripción al boletín electrónico Pruebas de trituración gratis

    Original URL path: http://www.retsch.es/es/aplicaciones/quimica-plasticos/dl_details/1/file/53e4b54e-003c-4e14-8466-636500000000/ (2015-09-25)
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    PVC EC directive 94 62 EC defines limits for cadmium lead chromium and mercury in packing materials and EC directive 2000 53 EC defines limits for the same elements in end of life vehicles This has created a strong need for a rapid and reliable testing method One of the preferred methods is x ray fluorescence analysis XRF The method is easy to use flexible and partly non destructive The

    Original URL path: http://www.retsch.es/es/aplicaciones/quimica-plasticos/dl_details/1/file/53e4b54f-e37c-46ac-8a25-636500000000/ (2015-09-25)
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  • Retsch : Home : Aplicaciones : Química / Plásticos
    the subsequent analysis If the particles are too coarse or non homogeneous the results of the analysis may turn out to be incorrect especially if there is only a very small amount of sample material which represents the total amount Most sample materials can be reduced to the required particle size at room temperature by the choice of a suitable crusher or grinder and the forces it produces impact pressure shearing cutting friction It may be necessary to carry out the size reduction process in two steps first pre crushing and then fine grinding Care must be taken that size reduction does not lead to a chemical modification or even decomposition of the material Moreover evaporation of the highly volatile substances as a consequence of temperature increase must be avoided Thus it is absolutely necessary to have sufficient knowledge about the material properties of the sample such as breaking behaviour or reaction to temperature changes to ensure a neutral to analysis size reduction Brittle materials like minerals salt or slag can be easily crushed by applying high mechanical stress through impact pressure or friction from outside However what can be done when the mechanical forces alone are not able to

    Original URL path: http://www.retsch.es/es/aplicaciones/quimica-plasticos/dl_details/1/file/53e4b553-7e08-4aaf-b7e1-636500000000/ (2015-09-25)
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    Analytical Methods AAS NIR XRF Home Aplicaciones Química Plásticos Química Plásticos Analysis of cadmium in plastics Descargar PDF Haga una selección pdf Inglés 2 MB In recent years mass media have focused on the topics of the environment and environmental conservation With the advancement in scientific technology resource development has progressed The developed resources have yielded a great deal of useful products that have enriched human life Volver Suscripción al

    Original URL path: http://www.retsch.es/es/aplicaciones/quimica-plasticos/dl_details/1/file/53e4b54f-1330-4983-98c4-636500000000/ (2015-09-25)
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    una selección pdf Inglés 97 KB pdf Inglés 153 KB pdf Alemán 152 KB pdf Alemán 98 KB X Ray fluorescence is one of the most versatile methods to determine elements in a sample The material is exposed to x rays that cause each element to emit its own unique fluorescent x ray The subsequent analysis of the results is based on comparisons to standard samples with given chemical composition Sample preparation of materials has become more and more important because of the rapid development and improvement of both software and XRF devices during the past few years that shifts the detection limit for trace analyses It is crucial to be aware of the particle size which needs to be between 20 μm and 60 μm as it can strongly influence the results given that the intensity of fluorescent x radiation decreases with increasing particle sizes Furthermore the sample needs to be both representative and homogeneous in order to eliminate factors such as unevenness of the surface that can also influence the results A decisive and often underestimated factor in the process of sample preparation is the use of sample dividing to guarantee that the sub sample accurately represents the

    Original URL path: http://www.retsch.es/es/aplicaciones/quimica-plasticos/dl_details/1/file/53e4b556-14e0-43c6-9b39-636500000000/ (2015-09-25)
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    already produced batch is suspended because the analysis results were not within the relevant critical values But does the tested product really deviate from the specifications The quality control managers are convinced of this because modern analysis instruments provide results with very low tolerances The sample in question was tested several times and the result was confirmed The question is why the product does not match the specifications although the

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