European-style cast aluminum dining tables and chairs are made of original aluminum rods, while wrought iron outdoor tables and chairs are made of wrought iron materials. Although they are all metals, alumina generated by aluminum oxidation is a dense substance, which can prevent the aluminum inside from being further oxidized, while rust generated by iron oxidation is a loose and porous structure, which is easier to absorb water, so cast aluminum tables and chairs are more durable than wrought iron tables and chairs. However, in order to prolong the service life of the cast aluminum tables and chairs in Xinningju, the glaze sealing process (spraying outdoor matte oil for high-temperature setting) must be adopted to ensure that the cast aluminum tables and chairs will not fade when used outdoors.