... of Plywood 1.Face/back: black film, brown film, 2.Core:poplar, hardwood 3.Grade: BB/CC 4.thickness: 9mm-25mm Plywood,Commercial plywood ... ,veneer faced plywood,CertificateISO9001,American CARB,CEBrand namePengYuanSize1220* ... problem of leaking and rough surface during construction process.Particular suiltable for watering concreat. types of plywood