Float, made by blow molding process, can float on the water surface. It is made of strong and tough polymer polyethylene and other materials, which have good weather resistance and impact resistance. It can resist UV rays, antifreeze, seawater chemical agents, oil stains and other erosion. It can automatically rise and fall with the fluctuation of water tide and is widely used in the construction of floating platforms such as pontoons and floating docks. Another type of buoy is a closed metal cylinder floating on the water surface, fixed with iron anchors at the bottom, used for mooring ships or serving as navigation marks.
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