Classifying chemicals for mechanical sealing. I. Fluids sensitive to small changes in temperature and or pressure. Vaporize Crystallize Become viscous Solidify Build a film on the seal sliding surfaces Increase the corrosion rate of the fluid. Dilatants increase their viscosity with agitation Thixothrophic fluids decrease in viscosity with agitation.
Plastic fluids release their viscosity suddenly.
Catsup is an example. Any time a premature seal failure would cause an expensive down time. Slurries are defined as solids in liquid. The number and size of the solids is not important. Fluids that react together to form a solid.