Assertion: honeycomb's porosity | /r/HasProperty | 50%
Facets:
value: in either case
type: TEMPORAL
value: preferably
type: DEGREE
Source sentences:
text: That is to say, according to a first invention of the present invention, there is provided a honeycomb structure having: a honeycomb substrate composed of porous partition walls forming a plurality of cells and a porous outer portion; and a resin composition on the outer portion of the honeycomb substrate, wherein the outer portion and the partition walls of the honeycomb substrate are formed of the same material; a porosity of the honeycomb structure is 50% or more; and the resin composition is impregnated into pores of the whole outer portion; and the impregnation depth is equal to the outer portion thickness or at least a part of the resin composition reaches the cell partition walls.
text: the outer portion and the partition walls of the honeycomb substrate are integrally formed of the same material; a porosity of the honeycomb structure is 50% or more; the catalyst composition is supported only on the partition walls of the cells and is not supported inside or on the surface of the outer portion; and inorganic particles that are components of the catalyst composition are not contained in the outer portion pores.
text: However, in either case, if the thermal expansion coefficients are the same, the porosity of the outer peripheral wall is preferably 50% or more.
text: For example, if the porosity of the honeycomb structure 10 is 50%, the area ratio of the pores is included in the range of 25 to 75%.
text: The porosity of the honeycomb structure thus manufactured was 50%.
text: Similarly, when the porosity of the honeycomb structure is 50% (Examples 4 to 6 and Comparative Example 2) and when the porosity of the honeycomb structure is 60% (Examples 7 to 9 and Comparative Example 3)
text: The problems of exuding of the catalyst slurry on the outer surface of the circumferential wall and an insufficient strength become significant especially in a honeycomb structure having a high porosity such that the porosity is 50% or more.