... materials(engineering plastics ) an injection molding.fall into two kindsbrood floor and into poultry floor2.Corrision resistance,anti-aging, In the ... , also won't be corrosion.4. life span 8--10 years.5.The floor joist is Enhanced model steel extrusion, Divided into ... raw materials and chemical products modification, the injection molding the floor again after six years or so, still can use.Large ...