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HIGH-TEMPERATURE SOLID LUBRICANT BORON NITRIDE The latest generation of lubricants from boron nitride is clean free from PTFE and silicone oil and with outstanding properties at high temperatures Currently the most common additive for lubricants is PTFE However PTFE is not resistant to high temperatures and is now under debate as ECHA classifies it as microplastics For our latest generation of lubricants we rely on boron nitride a natural raw material also known as “inorganic” or “white graphite” The hexagonal modification hbornitride which is similar to graphite is used as a lubricating agent In contrast to graphite the friction coefficient of hex - agonal boron nitride remains stable in excess of 1000 Cwhich is why it is very suitable as hightemperature solid lubricant under vacuum At high temperatures 1 400–1 800°Cand high pressure > 6GPa the hexagonal modification changes to the cubic modification analogous to the conversion of graphite to diamond Both boron nitride modifications are white and do not conduct electricity at low and moderate temperatures The boron nitride label resembles the hexagonal shape of a boron nitride molecule Boron nitride Graphite MoS 2 Very high High Average Low None Fr ic ti o n c o e ffi ci e n t μ Temperature °C 0 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 100 200 300 400 500 600 700 Properties Boron nitride Graphite MoS 2 PTFE Heat resistance > 400°C Heat dissipation Electrical insulation Oxidation resistance at temperatures > 400°C Source for chart and table https www bn saintgobain com sites imdf bn com files idealubebnplateletsde pdf ADHESIVE LUBRICANTS AND MAINTENANCE OILS 2