Calcium lignosulfonate* is just one in a series of non-
traditional methods of increasing the plastic properties of
clay. Developed in 1950s to increase the plasticity and green
strength of brick,1 calcium lignosulfonate is now used in almost
every type of ceramic manufacturing operation. When used in clay
bodies, calcium lignosulfonate makes the water “wetter,”
allowing less water to be used to make the clay body more
plastic. The additive contains a lignin-derived binder that
mechanically takes the place of some water in the clay body,
causing adhesion of the clay plates. This action reduces the
risk of clay body defects, such as excessive shrinkage, warping
and cracking during drying and firing. The increase in
plasticity is most noticeable in short or non-plastic clay
bodies, such as Raku, sculpture, and jigger- and ram-pressed
formulas. The additive can also be used in soda, salt,
porcelain, low-fire and tile clay bodies. Traditionally, ball
clays and/or bentonites have been used to increase plasticity, b