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. and the size according to clients demand,

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 40mm or 50mm,the bi-layer color steel sheet 0.5mm.

3.Two reinforcing ribs with a breadth of 45mm 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 50000 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.