Mag-Isover K.K., the Japanese unit of French building-material conglomerate Saint-Gobain, is ready to meet growing demand for insulation in the disaster-hit Tohoku region and elsewhere and expects the nation's energy-saving efforts to continue for years to come.

"Sustainable development (of the market) is not a fashion. It is really a long-term trend," President Francois-Xavier Lienhart said in a recent interview with The Japan Times.

Mag-Isover, which has 373 employees, is a leading maker of glass wool in Japan. The wool, made of recycled glass, is used to insulate houses and costs less than other insulating materials.