Heat-conductive sheet

A heat-conducting sheet comprising a first heat-conducting layer, a second heat-conducting layer, an interface, a polymer matrix, an anisotropic filler and a non-anisotropic filler, wherein:

• the first and second heat-conducting layers each comprise the polymer matrix, the anisotropic filler and the non-anisotropic filler, the anisotropic filler oriented in a thickness direction,
• the first and second heat-conducting layers are laminated via the interface,
• the interface comprises the polymer matrix and the non-anisotropic filler,
• a filling ratio of the anisotropic filler in the interface is lower than that in the first and second heat-conducting layers,
• the anisotropic filler has electrical conductivity,
• a filling ratio of the non-anisotropic filler in the interface is higher than that in the first and second heat-conducting layers, and
• the non-anisotropic filler has electrical insulation properties, and
• wherein, when a 400 μm line perpendicular to the thickness direction is drawn in the interface in a cross-section, then a ratio of a length of overlapping bubbles on the 400 μm line with respect to a total length of the 400 μm line is less than 20%.