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A porous separator allows more energy to be drawn from the battery than a nonporous one. There is often a misconception that hard surfaces are nonporous. So are solid plastics, metal objects, glass of all forms, ceramic surfaces like dishes etc, varnished wood.
All materials have small holes about the size of an atom.
I am frustrated by stone yards calling marble or dolomite granite or quartzite. It was sculpted by a local artist last year. Dubbin is one product that is frequently used to waterproof walker's boots. Most stone yards do not have samples and they sure are not going to let me put lemon juice on the slab.
