A method for preparing a ceramic fiber filter tube with high air permeability, including: using mullite short fibers as aggregates, adding glass fibers and silica sol as sintering aids, obtaining a ceramic fiber filter tube green body by using a filterer-pressing forming process, and obtaining the ceramic fiber filter tube with high air permeability by freeze-drying and heat treatment in turn. The combination of two sintering aids with different properties can effectively improve the performance of ceramic fiber filter tube prepared by a wet forming technology. At the same time, the freeze-drying treatment can block the migration path of nanoparticles in the silica sol to the surface of the ceramic fiber filter tube due to the capillary force, so that the properties of the prepared ceramic fiber filter tube are more uniform, providing a reference for the preparation of a ceramic fiber membrane with high flux.

The present invention is directed to a method for providing a surface, in particular a floor surface, with a layer of a magnetic and/or magnetizable cover composition, the surface having at least one layer of cementitious material, wherein the method comprises the step of spreading the layer of the cover composition onto the surface, the cover composition comprising a polymeric binder and magnetic and/or magnetizable particles, characterized in that the layer of the cover composition has a water vapor transmission rate of at least 0.25 g h.sup.1 m.sup.2 according to ASTM D1653, and the surface and/or the layer of cementitious material has a relative humidity of more than 75% according to ASTM F 2170-11.

The present disclosure provides a structure protection sheet comprising a polymer cement cured layer on a side facing a structure; a resin layer on the polymer cement cured layer; and a mesh layer.

A method for improving the air and/or water barrier performance of a building panel is disclosed. The building panel may be a gypsum board or cement board. In particular, the board may have improved resistance to bulk water penetration or permeation while maintaining breathability with respect to water vapor.