The term “pig” comes from the fact that when a product line carrying a product with poor lubricating qualities, this lack of lubrication causes the projectile to squeal like a pig.
The Solid Cast Pig is the process operations displacement pig. Standard elastomers available are polyurethane (both standard and chemical resistant); nitrile; ethylene propylenediene methylene (EPDM) and DuPont’s Viton® (two rubber-like elastomers); neoprene; and other compounded materials. The choice of which elastomer to use for the pig material depends on the coating or ink’s chemical characteristics, as well as temperature.