... vacuum casting technology 3Environmental-friendly, never rust Cast aluminum door,Cast aluminum explosion-proof doors, Xiamen Chen-Chi Doors ... Product merits:1.Rust resistant,no deformation,no cracking,shock resistance,aniti-moth,keeping warm, moisture-proof, heat insulation,wear ... product can be integrally cast. 2, Environmental-friendly, never rust.3, Great and elegant appearance.4,The world patent ...