A portable folding wheelchair includes a front U-shaped tube and a rear U-shaped tube pivotally coupling with each other through a pin to form a X-shape. The EBPVD apparatus generally includes a coating chamber that is operable at elevated temperatures and subatmospheric pressures. Placing a strip of cushioning material, such as the known as Polybubble Plastic, or corrugated cardboard, around the sides of the group of glass sheets, to provide a cushioning condition to the group of glass sheets during shipping and handling.