Ceramic catalyst substrate
Runda substrates are honeycomb-like structures with thousands of parallel channels. The walls of these channels provide the surface for precious-metal catalysts that convert noxious emissions into carbon dioxide, nitrogen and water vapor.

Runda substrates enable highly efficient emissions control systems by offering:
High surface area
Low pressure drop
Rapid light-off
Low coefficient of thermal expansion
Thermal-mechanical durability
System cost efficiency.