LLP "izolit"
Enterprise electrical insulating materials arranged in Petropavlovske in December 1941 on the basis evacuated part of the factories of Moscow and Moscow region, which was named later the Zavod imeni M. I. Kalinina.
The company was one of the largest in the Soviet Union manufacturer of electrical insulating products. In 90 years time, despite the difficult and continued throughout the further collapse of production, 9 January 1992 on the basis of Department №1 of Petropavlovsk electric insulating materials plant them. M. I. Kalinin was created the limited liability Partnership "izolit"