Pyrolytic Boron Nitride Filament Ring is often used to manufacture the wire rings used to hold Ta wire in MBE equipment due to its high operating temperature and vacuum characteristics. While the diameter of the raw PBN is limited by the size of the equipment, the finished PBN filament rings can be machined to highly customized shapes at a competitive price. 

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PBN is an advanced material with the following excellent properties

-Non-toxic and odorless;

-High purity and high density

-Chemically inert to most gases and molten metals, allowing pBN to be used in high-temperature processes without concerns about contamination and structural integrity

-Non-reactive with most molten metals, semiconductors, and their compounds;

-Good resistance to oxidation below 1000 °C

-good resistance to thermal shock

-High service temperature, no sublimation point, can be decomposed directly into B and N above 3000 °C

PBN Filament Ring Applications

-OLED evaporation unit


As a ceramic material, boron nitride is quite fragile in a lot of cases. The Pyrolytic Boron Nitride (PBN) Filament Rings are usually held in plastic bags by vacuum, and protected with heavy foam.