History

1919

• NGK INSULATORS, LTD. is established.

1923

• Production of bushings begins.

1929

• Completed construction of 1,000 kV-class insulator testing facilities.

1930

• Production of the “NG Spark Plug” begins.
  Notes:
• Renamed the “NGK Spark Plug” in 1934.
• Production transferred in accordance with the spin-off of NGK Spark Plug Co., Ltd. in 1936.
• Research on permeable substrates begins.

1931

• First deliveries of acid proof pumps are made.
• Production of acid proof cement begins.

1932

• Sale of NGK laboratory porcelain ware begins.

1934

• First deliveries of ceramic diffusers are made.

1938

• Production of titanium porcelain is developed.

1943

• Production of short-wave insulators begins.

1953

• Production of solid-core station post insulators begins.

1954

• Silicon carbide firing kiln shelves and supports are developed.

1955

• Research on Beryllium begins.

1958

• Production of beryllium-copper master alloy begins.

Note:

• Products marked with a dot (●) are no longer manufactured or sold (including those transferred to another group company).