SCHONLAU CAST IRON – is comprised of 5″ PermaBeam, plastic creep, and Schonlau cast iron; one of the best cast iron floors on the market. The cast iron is cool for the sow and uncomfortable for the little pigs so they are inclined to stay off of it and less likely to get crushed. Pig Producers reported they save at least one pig per litter from a crush death, making the combination flooring system very cost effective.