| 摘要 |
The holding sealing material of the present invention is a holding sealing material including coated fibers including inorganic fibers having a surface coated with a binder layer, wherein the binder layer contains an organic binder and an inorganic binder, and the coefficient of coated fiber diameter variation d of the coated fibers is 25% or less as measured using an image taken with a scanning electron microscope at a magnification of 1000 times and expressed by the following formula (1): Coefficient of coated fiber diameter variation d % = D max ˆ’ D min / D × 100 where d is the coefficient of coated fiber diameter variation of the coated fibers, D max is the average maximum diameter of the coated fibers, D min is the average minimum diameter of the coated fibers, and D is a reference diameter that is the average of the average maximum diameter D max and the average minimum diameter D min . |
