A specimen may be composed of plied pieces to obtain
the necessary thickness, but determinations made on such
specimens may not agree with those made on solid specimens
as the surfaces of the plied specimens may not be in complete
contact. The lateral dimensions of the specimen shall be
sufficient to permit measurements at least 12.0 mm (0.48 in.)
from any edge unless it is known that identical results are
obtained when measurements are made at a lesser distance
from an edge.