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Surface treatment:mill finish/powder coating/anodized/electrophoresis/wooden grain;Thickness:0.2-20mm or Customized;Length:Custom Length;Color:Custom Color;Material:All types of Aluminum Alloy;MOQ:1000 kg;Capability:1500 tons per month;Type:Aluminum Extr
It's an extruder's problem - this is known as HOT SPOTS defect, mostly in elliptical shape and in various sizes. You cannot do anything to it in your surface treatment facility. Extruders have to improve the cooling of hot extrusions during extrusion process. You can send an official compla...