Description

1. The surface material for the door panel is hot-dip galvanized steel sheet and the surface paint is flour-carbon paint, fancy rectangle grids on the surface of the door. 2. The sandwich of the door panel is made of environment-friendly polyurethane material,heat insulation, sound insulation and fire resistance; the thickness of the complete panel is *0mm or *0mm,the bi-layer color steel sheet 0.5mm. 3.Two reinforcing ribs with a breadth of *5mm inside the door panel. 4.Ordinary concavo-convex slot mode and hand-squeezed prevention arc mode. 5. The track is made of 1.5mm hot-dip galvanized steel sheet and undergoes plastics spraying surface treatment. 6. Adopt torsion spring balancing settings in the balancing system;its service life can last more than ****0 times. 7. Adopt polyurethane seals and anti-freezing seals, damp-proof, waterproof, dustproof, anti-aging properties. 8. Central hinge made of thick steel, hot-dip galvanized treated, rust resistance,durable. 9. Adopt nylon double-bearing idler wheel of high quality and intensity, lower noise, more durable. *0. The noise during the operation process is <*0 (dB).