NDK has production and engineering facilities in Japan, China, Germany, Malaysia, and the United States.

NDK's Belvidere, Illinois facility was heavily damaged in 2009 when one of the crystal autoclaves ruptured violently, causing an explosion.

The explosion scattered debris over a wide area, with a 7-foot support beam striking and killing Ronald Greenfield of Chesterfield, Indiana, who was refueling at a nearby truck stop.

[8][11] The rupture was in a crystal-growth autoclave that had undergone stress corrosion cracking and was inadequately inspected; recommendations from a previous incident were ignored.

[13] The U.S. Chemical Safety Board investigated the incident and published a video titled "Falling Through the Cracks."