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This is American standard slip-on flange, the material is A105. The outside packing of the flange uses plywood boxes and inside lining plastic sheeting for moisture-proof, on the surface is pickling oil, in the picture waterline (sealing surface) using the activity-type plastic case for protection against waterline is bumped in the shipping and the loading and unloading and impacting on the sealing performance of the products. The cost of the protection of the shell requires additional consideration. The products above 20"(DN500) was using the tray packing, water line protected with the corrugated board, not the plasitc case. The weight of Each box or tray at the most 1.2 tons.
