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，需要具有粘接强度高，抗温差能力强，耐候性好，固化后具有微弹性，令角码与型材进行柔性连接。国际通用为以聚氨酯（PU）为主要成分；环氧胶虽然力学性能足够，但是无弹性，类似于刚性铆接，在受到各种力学冲击时无法减弱力的传导，易发生脆性破坏，因此环氧胶并不适用于门窗组角。
使用专用组角胶，可以有效解决门窗的角部变形、错位问题，从而提高门窗门窗角部强度、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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