A toner supply roller is provided which has the most uniform and greatest possible foam cell diameters and a lower hardness particularly even in a lower-temperature and lower-humidity environment as compared with the conventional art and is less liable to suffer from imaging failure such as uneven density and white streaks. An image forming apparatus employing the toner supply roller is also provided. The toner supply roller (1) is produced by preparing a rubber composition which contains a rubber component including an epichlorohydrin rubber and an acrylonitrile butadiene rubber, an electrically conductive carbon black, a crosslinking component and a foaming component and, while extruding the rubber composition into a tubular body, continuously foaming and crosslinking the rubber composition of the tubular body by a continuous crosslinking apparatus including a microwave crosslinking device and a hot air crosslinking device. The image forming apparatus incorporates the toner supply roller (1).

Provided is an electromagnetic dielectric material (1). The electromagnetic dielectric material (1) is a column structure. The electromagnetic dielectric material (1) includes an inner core (11), a first foam layer (12) and a second foam layer (13) sequentially arranged from inside to outside on the cross section of the column structure. The first foam layer (12) and the second foam layer (13) are each a layer formed from a foam material foamed. The electromagnetic dielectric material further includes metal wires (14). The metal wires (14) are disposed in the longitudinal direction of the column structure, are not in contact with each other and are evenly distributed on the periphery of the first foam layer (12). Further provided is a method for producing an electromagnetic dielectric material (1).

An anisotropic multilayer film comprising one or more foam layers is described herein.