UNE 104-311-1991 Plastics. High density poliethylene sheets coextruded with other types of polyethylene for waterproofing in civil works. Specifications and test methods
This standard aims to define the characteristics and test methods of sheets formed by a central layer of high-density polyethylene (HDPE), which is the majority material of the sheet, and two external layers of a more flexible polyethylene that facilitates welding. ; for use in waterproofing civil works. The handling and placement of these materials is not the subject of this standard.