Polyurethane grater - made of polyurethane foam, the density and quality of which determine its service life. It has a rough working surface, equipped with an ergonomic handle. Most often scratch Board is used for walls: smoothing and sanding the plastered surfaces, grout plaster, removal of large abrasive particles, which is especially important if the next stage of finishing works, is painting. The advantage of plastic float in front of the wood – it's light weight and high resistance to abrasion.
The wear of the graters depends on the plaster mixture and the condition of the surface to be rubbed.