Our POCO® graphites have excellent thermal properties. The polycrystalline, fine-grain graphites are isotropic, high-strength materials that improve wear and resist breakage. Materials without a grain direction offer maximum design flexibility.
These graphites are not affected by brazing temperatures and provide good heat transfer. Graphite fixtures remain dimensionally stable even after repeated cycling.
In an inert atmosphere, POCO graphite can be exposed to temperatures in excess of 2500°C and still can maintain its physical properties. If heated in atmospheric conditions, the graphite will begin to oxidize above 475°C. Compared to other fixture material (metals, ceramic and glass), our graphite has excellent thermal shock resistance properties.
The CTE of POCO materials are closer to metals than other graphites. This helps eliminate misalignment problems between the package and fixture.