Free boron will not be liberated under normal operating conditions or thermal decomposition of boron nitride. Exposure to boron nitride will not result in boron poisoning. Flush eyes, including under the eyelids, with large amounts of water. If irritation persists, seek medical attention. Wash thoroughly with mild soap and water.
Ingestion is unlikely.
If ingested, the preferred method of elimination is through natural gastrointestinal elimination. Drink extra water. Seek medical attention if gastrointestinal symptoms develop. Remove to fresh air. Seek medical attention if irritation results.