The second tier of market taxonomy separates Heat Conducting Fillers by material type, each offering distinct thermal conductivity, processability, and cost profiles that shape segment contribution. Metallic fillers, chiefly silver, copper and aluminum particles, deliver the highest intrinsic conductivity (up to 400 W/m·K) and dominate high‑value niches such as aerospace electronics, representing roughly 30 % of type‑based sales despite premium pricing. Ceramic fillers—including aluminum nitride (AlN), boron nitride (BN) and silicon carbide (SiC)—balance moderate conductivity (30‑150 W/m·K) with electrical insulation, making them the preferred choice for automotive power modules and industrial heat sinks; they collectively account for about 45 % of the market by volume. Polymeric or carbon‑based fillers, such as expanded graphite, carbon nanotubes and graphene, provide flexible formulation options and lower cost, supporting bulk applications in consumer electronics and large‑area thermal pads, contributing roughly 20 % of revenue. A growing hybrid filler segment combines metallic and ceramic phases to achieve tailored performance, currently a niche of around 5 % but expected to expand as design requirements become more complex. This type‑focused Heat Conducting Filler segmentation clarifies how material attributes drive adoption across end‑use sectors.
