European-style cast aluminum dining tables and chairs are made of primary aluminum poles, and wrought iron outdoor tables and chairs are made of wrought iron materials. Although they are all metals, the alumina produced by aluminum oxidation is a dense substance, which can prevent the aluminum inside from further oxidation, while the rust produced by iron oxidation is a loose and porous structure, which is easier to absorb water, so the cast aluminum tables and chairs are more durable than the wrought iron tables and chairs. However, in order to prolong the service life of 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.