Polyreflex polypropylene bubble board is a hollow triple-wall structure plastic board with a cylindrical structure as the core layer and single or double flat surfaces with a bubble finish. PP bubble board can be compounded with non-woven fabric to obtain more applications, such as the spare wheel covers in the car trunk. It is environmentally friendly, non-toxic, odorless, flame retardant and noise isolating, so it is widely used in the automotive industry, as luggage liner panel, seat back panel, wall lining and flooring of van, SUV, caravan, etc.