The integrity and impermeability of this asphalt coat are quite as vital as constant saturation.
It is only when in combination that it exhibits this impermeability to the obscure rays.
The impermeability of plastic clay to water is a characteristic which is important for many purposes.
The fused portion fills the pores or interstices of the material, making—when cold—a ware of great strength and impermeability.
impermeable im·per·me·a·ble (ĭm-pûr'mē-ə-bəl)
Impossible to permeate; not permitting passage.