GB/T 18840-2018 in English

Background and Significance of the Standard

GB/T 18840-2018 "Base of Asphalt Waterproofing Membrane" is used to standardize the technical requirements and test methods of base materials in the production of asphalt waterproofing membranes. This standard replaces the previous GB/T 18840-2002 version. The main revisions include term definitions, classification and marking, physical and mechanical performance requirements and test method updates.

The formulation of this standard aims to improve the quality of asphalt waterproofing membranes and ensure their reliability and durability in building waterproofing projects. As the core part of waterproof membranes, base materials directly affect the performance and service life of the products, so this standard has important guiding significance for the industry.

Classification and Use of Base Materials

Physical and mechanical performance requirements

According to different types of tire base materials, GB/T 18840-2018 stipulates a number of key performance indicators:

• Tensile force and elongation: Ensure the material's ability to resist stretching during construction.
• Tear strength: Measure the material's resistance to damage.
• Moisture content and water resistance: Ensure the material's performance in a humid environment.
• Thermal dimensional stability: Ensure the material's shape is stable under high temperature conditions.

For example, the tensile strength requirement of polyester felt is ≥450 N/50mm in the longitudinal direction and ≥350 N/50mm in the transverse direction; the tear strength requirement is ≥160 N in the longitudinal direction and ≥120 N in the transverse direction.

Test methods and implementation recommendations