常用玻璃钢法兰多用于压力不大于3MPa的中低压力管道、容器，主要结构形成有整体法兰、粘接法兰和活套法兰。
The commonly used FRP flange is mainly used for medium and low pressure pipes and vessels with a pressure of no more than 3Mpa. The main structures are integral flange, adhesive flange and looper flange.
整体法兰一般为等壁厚平板法兰。该结构的优点在于法兰环与筒体为整体成型，增强玻璃纤维及织物是连续的，能充分发挥玻璃钢强度高、易成型的特性，其缺点是等壁厚结构与法兰内应力分布不匹配，难以实现等强度、等刚度设计要求；使用中，法兰环与筒体交接处易在纵向应力作用下出现较大变形，甚至出现微裂纹和开裂破坏。
The integral flange is generally flat flange with equal wall thickness. The advantage of the structure is that the flange ring and the cylinder are integrally formed, the reinforced glass fiber and the fabric are continuous, which can give full play to the characteristics of high strength and easy forming of FRP. The disadvantage of the structure is that the equal wall thickness structure does not match the stress distribution in the flange, and it is difficult to achieve the design requirements of equal strength and rigidity. In use, the joint of the flange ring and the cylinder is easy to appear larger under the effect of longitudinal stress Deformation, even microcracks and cracking failure