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A Brief Introduction to Plastic Proficiency Testing
Proficiency Testing is Determined as a process of evaluating a laboratory's performance under Checked conditions In relation to a known set of criteria through analysis of Undiagnosed samples Supplied by an external Origin.
Plastic is the general ordinary label for a broad range of man-made or semisynthetic organic unstructured solid supplies used in the manufacture of engineering products. Plastics are Usually polymers of high-level molecular mass, and can contain other substances to increase performance and Minimize costs.
Almost no contemporary products are Developed lacking the employment of at least various plastic parts, and the amount of plastic parts in products is increasing all the time. Contemporary engineered plastics are Robust, light mass, and strong to substance attack and deterioration, and come in a staggering range of colors and textures. However, with the expand in employment of such supplies has come the need for various analytical techniques and expertise for their characterization.
Material specifications catalog specific performance necessities for diverse grades of plastic. Material specifications fluctuate from test methods for the reason that test methods simply identify how to test for a property but do not include acceptable ranges for the test results. ASTM, SAE, and the military all publish plastic certification principles.
According to temporal sequence, the particular procedure of proficiency testing of Barrier property test of plastic packaging material as well as research of proficiency testing, specimen preparation, homogeneity and stability tests of samples, specimen distribution, testing data receiving from laboratories engaged, result statistics, supplement testing and publication of the decisively findings. The product of every part can be further separated into less important parts.
To test the validity of their ICP-MS method the laboratories took part in the proficiency test: "Cadmium and Lead in Plastics" that was administered by the Institute for Interlaboratory Studies (IIS), in the Netherlands. At present, this is the only international proficiency test that is based on the ISO/IEC Guide 43. According to it, this test attracted the participation of 56 analytical institutions from 20 countries all over the globe, with a generous quantity of participants from Japan, Hong Kong, China and other areas in Asia.
Units are indirectly connected to test principles and deserve particular attention, for the reason that they are a origin of some confusion. The primary confusion comes from Izod and Charpy impact units differing among the ASTM and ISO principles. ASTM specifies units of energy per unit length (J/m), while ISO specifies units of energy per unit area (kJ/m ). ASTM specifies SI units as the standard for many of its test methods. If you were expecting units of ft-lb/in for the ASTM Izod item, then you have fallen victim to another cause for confusion; component system/test standard grouping. ASTM principles are reported in English units and ISO principles are reported in SI units so often that we've been conditioned to expect these combinations. If you're not a fan of SI units, you're in luck, because you can choice the displayed element system on IDES datasheets. If you still don't see a unit you're comfortable with, you can every time execute a unit conversion, supplied the units are of the same division. You can't however, convert J/m to kJ/m .
Daniel Garcia is manager of Ibertest Internacional - Materials Testing
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| Category: Articles | Added by: forex_s (2010-01-13)
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| Views: 175
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