A ceramic honeycomb structure having a large number of flow paths partitioned by porous cell walls, the cell walls meeting the conditions; (a) the cell walls having porosity of 55-80%, (b) the cell walls having a median pore diameter D50 (measured by mercu...

The present invention aims to provide a honeycomb structure capable of preventing a plugging failure and forming cracks by heat shock which are caused by a cell having a small cross-section. The present invention is a honeycomb structure used for a filter ...

A porous metal foil of the present invention comprises a two-dimensional network structure composed of metal fibers. This porous metal foil has superior properties and can be obtained in a highly productive and cost effective manner.

Adsorption filter (I) comprises at least one layer of activated charcoal particles (a), where at least 20% of (a) exhibit a particle size of less than 0.180 mm and the total area weight of (a) is 100-500 g/m2>. An independent claim is also included for a c...