Packaging materials are disclosed, along with packages formed therefrom and methods for forming the packages. Said preparation can further comprise one of the following constituents: one or more polymers dispersible in the melted mass formed by the constituents of the preparation, one or more mineral additives, one or more surfactants, one or more antioxidants, one or more colouring agents. The light guide components includes a first light guide component and a second light guide component. Means are provided for removing oversized bed material from the first section to facilitate the removal of ash while minimizing the possibility of ash plugging during operation.