组角胶主要用于角码连接型的门窗，将角码与型材腔壁进行粘结，起角部结构加强作用，又称组角结构胶或组角密封胶。国际通用为以聚氨酯（PU）为主要成分。
门窗的角码连接固定的门窗角部，很容易在生产、运输、安装和长期使用过程中受各种力的作用受到破坏。使用专用组角胶，可以有效解决门窗的角部变形、错位问题，从而提高门窗隔热性、气密性、水密性、隔音性等性能，保证门窗的节能效果。
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