porous material
Technical term used in materials science, engineering, and related fields. Refers to a substance containing pores or voids.
Porous materials are often used as thermal insulators.
A special porous material is used in this filter.
多孔質 is an adjective meaning 'porous' or 'porosity', while 多孔質材 specifically refers to a porous material or substance.
Compound of 多孔質 (takōshitsu, 'porous') + 材 (zai, 'material').