The cabinet side panels are made of 1.5mm thick cold-rolled steel plates, and the surface treatment is powder sprayed by German Wagner automatic spraying line, which has passed the 500-hour salt spray test. The sealing strips are processed by German Sondernhoff dispensing machine and are foamed and molded by imported polyurethane raw materials. The contact between the profile and the cabinet side panel strips is surface contact. The strips are continuous and neat, and the rebound and sealing life can reach 50 years. The hardness and thickness can be adjusted, and the sealing performance is high. It reaches IP55 protection level.