SEARCH Articles Figures Tables IV however, shows that the sapwood is filled to a much greater extent than the heartwood for six of the eight species. This is contrary to what would be assumed from the measured void volume. The sugar maple and the basswood are the two exceptions there is essentially the same retention of polymer in the sapwood and heartwood. The heartwood probably has less of the voids filled with polymer, because of organic deposits and tyloses, which block the penetration of the monomer into the capillaries. [Publishers Imprint] See Also: IV however, shows that the sapwood is filled to a much greater extent than the heartwood for six of the eight species. This is contrary to what would be assumed from the measured void volume. The sugar maple and the basswood are the two exceptions there is essentially the same retention of polymer in the sapwood and heartwood. The heartwood probably has less of the voids filled with polymer, because of organic deposits and tyloses, which block the penetration of the monomer into the capillaries.