膜式（双膜）沼气储气柜主体膜材采用高强聚酯织物制成，一般分内膜和外膜，也可订制成单膜系统；内膜具有抗腐蚀及各种微生物的能力，高度防火并符合德国标准。内膜与底膜之间形成一个容量可变的气密空间用作储存气体，外膜构成储存柜的球状外型，作为保护内膜和形成挤压内膜的压力空间，具有抗紫外线和保护内膜的作用，同时具有自洁功能。

The main membrane material of the membrane type (double membrane) biogas storage holder is made of high-strength polyester fabric. generally divided into inner and outer membranes, and can also be customized into a single membrane system.The inner film has the ability to resist corrosion and various microorganisms, is highly fireproof, and meets German standards. A variable capacity airtight space is formed between the inner membrane and the bottom membrane for storing gas. The outer membrane forms the spherical shape of the storage holder, which serves as a pressure space for protecting the inner membrane and compressing it. It has the functions of anti UV and protecting the inner membrane, as well as self-cleaning.