Standard for inspection of asbestos
test methodAsbestos testing methods are many, because the asbestos environment is different, the purpose of evaluation is different, the choice of methods are different, so there is no test can solve all the problems. Only by combining them can the validity and accuracy of the detection be guaranteed. According to the practice of asbestos inspection and reference to relevant standards at home and abroad, the main methods of combining XRD and PLM two instruments are used as the technical methods of asbestos detection in industrial products.X ray diffraction (XRD) test principle for each mineral has its specific X ray diffraction data and the intensity of the diffraction peaks of the map, and its content is proportional to the relationship, to judge whether a sample contains asbestos minerals and its content determination. This method was asbestos species, and quantitative analysis; polarizing microscope (PLM) is mainly through the observation of mineral crystal morphology, refractive index, interference color, dispersion, ductility, color, colour, cleavage, contour, projection, rough surface, Beck line characterization of asbestos minerals; XRD can detect asbestos minerals, but unable to confirm its morphology is fibrous, so you need to use PLM to confirm, through these two kinds of equipment combination analysis.
China asbestos standard system includes nine national asbestos standards.GB/T 8071-2008 chrysotile asbestosGB 8072-1987 "sampling method for chrysotile asbestos"GB 8073-1987 "wet determination method for chrysotile asbestos"GB 6646.1-1986 "dry classification method for chrysotile asbestos"GB 6646.2-1986 "wet asbestos fiber length wet classification method"GB, 6646.3-1986 "quick wet classification method for chrysotile asbestos fiber length"GB, 6646.4-1986 "method for determination of specific surface area of chrysotile asbestos"GB, 6646.5-1986 "methods for determination of chrysotile asbestos and asbestos content."GB, 6646.6-1986 "method for moisture determination of chrysotile asbestos."The above criteria include a product standard, a sample preparation standard, and nine test method standards (in which appendix of GB 8071-2001 and appendix B specify two test methods).Other major asbestos products are standard:Standard for hygienic protection distance of asbestos products factory, standard number: GB18077-00, release time: 2005-1-28Hygienic standard for asbestos fibre in workshop air, standard number: GB16241-96, release time: 2005-1-28"Asbestos cement corrugated sheet and ridge tile" standard number: GB/T9772-96 release date: 2005-1-28"Asbestos rubber sheet" standard number: GB/T3985-95 release time: 2005-1-28
The standard system of chrysotile asbestos in China has been established on the basis of reference to the standards of the advanced countries in the world and the actual conditions of china. It not only specifies detailed inspection methods and determination methods, but also specifies detailed inspection equipment parameters.In 1961, Chinese promulgated the industry to build non metal ore Research Institute for reference by Soviet standards asbestos industry standard, building standard 54-61 "chrysotile" standard.In 1987, China formulated GB8071-1987, chrysotile asbestos, GB6646-1986, chrysotile asbestos inspection methods and other standards.In 1998, the national standard of GB8071-1987 asbestos was revised by the Xianyang Institute of non-metallic mineral research and design. Increase the definitions of revision, modify the product code, cancel the product classification, will reflect the degree of fiber loosening the specific surface area of the project to release the project determination, will be divided into test type testing and factory inspection, increase the operability of standard test, save time and cost, the provisions of the rules of inspection, strict inspection, the risk of reasonable allocation, the formation of a more advanced and perfect the standard system of asbestos.
