While not as strong mechanically as millboard, strawboard is much less laminated and is therefore less likely to split or open out when handled. If its weakness to bending stresses could be improved, as described above, it would actually be preferable to millboard for use in bookbinding. In addition, it has been demonstrated that strawboard is less likely to form sulfuric acid because it contains a lower percentage of iron impurities than does millboard, and it is alkaline, which in itself promotes greater permanence.
The use of strawboard in bookbinding was unknown until about the middle of the 18th century, and its use has never been extensive. (58 , 198 , 236 )