A composite layered sheet or composite layered film made from thermoplastics or thermoplastic mixtures comprises at least one substrate layer A) and at least one functional layer B) which comprises one or more blowing agents or nucleating agents, where the functional layer B) is thinner than the substrate layer A). A process for producing the sheet or film and a process for producing thermally insulating moldings are described.

A lightweight, structurally strong, corrosion resistant cabinet comprised of plastic and including a bottom sump for storing corrosive materials is provided. The cabinet has a removable bottom shelf beneath which the sump is located for receiving and holding corrosive materials released in the cabinet chamber. Top, bottom, back and side walls, cabinet door(s), and cabinet shelves each have a honeycomb core that is bonded on each opposed face to at least one overlying layer of fiberglass and resin. The cabinet is preferably comprised entirely of corrosion-resistant plastic.

A multilayer protective film useful in insulated wall structures of appliances such as refrigerators, freezers, or boiler units, for example. The multilayer protective film has a substantially polyolefin protective layer. The multilayer protective film also has a substantially polyolefin surface capable of bonding to polyurethane foam without the use of an adhesive. The multilayer protective film bonds to and protects thermoplastic liners from attack by blowing agents used in the production of polyurethane foam. The multilayer protective film is also adaptable to be regrind-compatible into thermoplastic liners made of styrenic polymers.