Composite covers installation features: First, when you install the covers on the asphalt pavement, construction machinery must be taken to avoid direct rolling wells seat, in the road the whole cast, and should be set aside on the road is slightly larger than the base of the well bore Hankou electricity composite covers after placement of the asphalt Puwan Second, cast concrete or asphalt base will be well laid back, should be promptly cleaned composite covers covers open, avoid mortar or asphalt will pour inspection covers and seat into one, so as not to affect the future open. Ductile ductile iron manhole cover is a product, ductile through ball and get inoculation huangpi spheroidal graphite composite covers size, effectively improve the mechanical properties of cast iron, especially to improve the ductility and toughness, resulting in higher than carbon steel strength. Ductile iron is the 1950s developed a high-strength cast iron materials, its overall performance is close to steel, is based on its excellent performance of the new continent composite covers model has been successfully used for casting some of the complex forces, strength , toughness, high wear resistance requirements parts. Ductile iron has been behind the rapid development of gray cast iron, cast iron material is widely used. The so-called "iron and steel", mainly referring to ductile iron. Huangpi composite covers size | show-Technology (certified) | composite covers from Wuhan Optical Valley Wing Environmental Science and Technology Co., Ltd. was provided. Environmental Science and Technology Co., Ltd., Wuhan was Rong (www.crkjhb.com) (www.crkjhb.com) is Wuhan, a leader in environmentally friendly products processing, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum to meet customer needs. In the form of wing technology leadership with the staff warmly welcome all inquiries negotiations to create a better form-technology future. You can also access (www.crkjhb.com/supply_details_46736280.html), for more information about the company.