PG Coated Graphite Rod: A rod-shaped component made from a high-purity graphite substrate with a dense pyrolytic graphite (PG) coating formed via chemical vapor deposition (CVD). It retains the high strength and excellent high-temperature resistance of graphite, while offering uniform high thermal conductivity, low chemical reactivity, and low gas permeability. The smooth coating effectively reduces material adhesion and impurity release. It is suitable for high-temperature, vacuum, and inert-atmosphere conditions, and can operate stably in long-term, high-precision thermal processes.