Some structures are much less template specific. A1Po4-5 can be synthesized with 23 different amine and quaternary ammonium compounds. The large one-dimensional cylindrical
pore system perhaps imposes fewer constraints on the template fit. Because of the neutrality
of the A1P04 network, the template is not needed as a charge-balancing agent; therefore, its incorporation into the structure is more a function of its size and shape relative to the channel volume to be filled.