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The door was sheet metal welded on to the frame of iron.

l Outer frame may choose the paper frame , the galvanization iron frame, or aluminium alloy frame.

Testing specimens shall be placed on and at the same level of the testing steel frame.

Oil pollution can cause-and-glue dust and weak iron box bond.

Is the Web with glue and iron box bond.

if the screen cloth and iron box between the glue coating is too thick, easy to add the coating of ductibility in the drying shrinkage in;

Glue is too thin and iron box easily enough adhesion tension;