In some foreign sources, and has proposed a durable life of color-coated film refers to severe hardening of time before chalking Shandong color coated paper, referring to provisions in the life of no cracks, no shedding. So color coated paper quotes with different types of paint production of color-coated, its life is also different. According to Baosteel data reported in various types of paint (urban environment) using the same conditions, the service life is shown in Table 4-8-11. According to the British Imperial Chemical Industries (ICI) coil coatings product information on the life expectancy of its typical products are shown in Table 4-8-12. Also, according to data reported for outdoor use due to color-coated, erosion by pollution and climate conditions change, when the organic coating may cause long-term sun exposure were hardened and chalking, due to moisture and to the bulge and loose holes, eventually becoming lost When the protective effect of the coating, the need for repainting maintenance processing. In the time before this deal as a concept of life is life. According to this concept, foreign to today's level of development of the paint that is possible to determine the coating color coated in some heavily polluted climate of a lifetime of 20 years, the rural areas of 30 to 40 years. More use of domestic high detection accuracy and faster method micrometer coating thickness as the detection method of color-coated. While abroad due to less volatile substrate measured fluctuations DJH law also smaller, and therefore more affected by human factors using small impact DJH law. International and domestic other international and national methods for coating thickness measurement methods include other wedge-cut method, the thickness difference measurement, weighing, X-ray fluorescence method, β-ray reflection method, measuring the magnetic and eddy current measurement method. Caitu GB in the case of magnetic magnetic thickness measurements Boxing color coated paper, French micrometer thickness difference measurement method, drilling destructive microscopic observation are wedge-cut method color coated paper, microscope method for arbitration test methods. Weighing method is very complicated, does not apply to factory laboratory for fast-paced; X-ray fluorescence and β-ray reflection method is by measuring the characteristics of the coating element content of a coating thickness is calculated, which for color-coated seed coating formulation is not fixed samples is not applicable. Eddy current measuring method in the research and testing operations, found that the current coating thickness measurement caitu most accurate and most simple is a way to combine magnetic and eddy current measurement measurement equipment, measured at the same time through a combination of probe Coating thickness and the total thickness of the coating, the coating thickness is calculated. This measurement method is due to the same point of measurement for coating thickness and the total thickness of the coating, thus avoiding the magnetic thickness of the coating by the method of the fluctuations, the accuracy of measurement results has been markedly improved. Boxing prepainted steel coil _ Jinhong Run (certified) _ Wenzhou color coated paper provided by the Boxing Xingfu Town 金宏润 Steel Industry and Trade Ministry. Boxing Xingfu Town 金宏润 Steel Industry and Trade Ministry (www.bxjhr.com) (www.bxjhr.com) is a leader in Binzhou, board (with) wood, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Jinhong Run Steel leadership with the staff warmly welcome all inquiries negotiations to create a better future for the steel Jinhong Run.