For reduction of the particle emissions of combustion engines, HJS has been developing and producing application-optimised filter systems since the 1990s. There are HJS products available for cars and commercial vehicles, but also for industrial engines and off-highway applications. In this case, as well as market standard ceramics, HJS also uses in-house sintered metal technology.

HJS offers solutions for original equipment, for retrofitting existing vehicles as well as for the spare parts trade.