See dry compression. In this case, the test is done with a wet separator. It is an indicator of how much the separator will relax once the acid is added to the cell and can be used to estimate final cell compression.
A measure of how high acid will wick up a separator, under controlled conditions, when upright, with one end dipped in acid. Generally speaking, finer fiber will create smaller pores with higher capillary attraction resulting in greater wicking height.
A measurement of the speed at which acid will wick up a separator when upright with one end dipped in acid. Generally speaking, larger pores will allow for faster wicking but will have an inverse relationship to wicking height (see wicking height above).