防渗薄膜在抗剌穿、抗撕裂和抗其它形式的损害中,其性能可用强度和延伸率来表示。不同的试验可结合在一起进行。在非增强类薄膜中,本指南将低模数材料和高模数材料区分开来。所谓低模数材料,即在低应力时显著延伸,并分布荷载,这类材料(如橡胶)有平滑的应力应变曲线。而高模数材料(如一些塑料),在初始应力阶段几乎不延伸,但随后常常屈服,并具有塑性,这类材料在低应变 Impermeable membrane in anti-puncture, tear and other forms of damage, its performance can be expressed as strength and elongation. Different tests can be combined together. In non-reinforced films, this guide distinguishes low-modulus materials from high-modulus materials. The so-called low-modulus materials, that is significantly extended at low stress, and the distribution of load, such materials (such as rubber) has a smooth stress-strain curve. While high-modulus materials, such as some plastics, barely extend during the initial stress phase, but then often yield and are ductile,