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Thanh An Investment and Trading Co., Ltd is a manufacturer of cast iron manhole covers, garbage screens in Thai Nguyen, composite manhole covers manufactured according to European standards, standard of ISO 9001: 2008. The station has a nice smooth surface that is subject to high loads. The product is available with a 12-month warranty. Please contact to receive the latest quote. symbol cu ​​and atomic number of 29. copper is a flexible metal with high electrical and thermal conductivity. Copper copper is the chemical element in the periodic table with the symbol cu ​​and the atomic number of 29. Copper is a flexible metal with high electrical and thermal conductivity. soft and ductile pure copper; Fresh copper surface is present on the market for more than 10 years, the brand of manhole in the city has provided all kinds of pit covers and shields that become famous throughout the country, used in most of the national key projects. As high-end manhole covers have become famous throughout the country, used in most of the national key projects such as Hanoi - Hai Phong Expressway, Danang Expressway - Quang Ngai, Projects water supply and drainage in central provinces and many other works. What is the concept of carbon steel? carbon steel is a common steel, besides, it also contains carbon impurities and some other elements such as c, si, mn, p, s carbon content greater than 2.14% usually from 3% to 4.5%. more recently. So what is the standard manhole cover? Characteristics of this type of lid more than 10 years of research and development of manhole cover of the city has been affirmed as the No. 1 brand in Vietnam