瞬時透水壓(iWEP)與延時透水壓(eWEP)：二者之間的區別是什么？
瞬時透水壓(iWEP)測試是一種透水壓測試，在測試過程中，水在漸增壓力下作用于防水透氣膜的一側，直至第一滴水穿透到該透氣膜的另一側。該測試旨在測量透氣膜在水滲透之前可以承受“多大的壓力”。
延時透水壓(eWEP)測試 所提供的信息多于瞬時透水壓(iWEP)測試，因為該測試同時測量透氣膜可承受“多大的壓力”和“持續多長時間”。例如，某給定防水透氣產品的最小透水壓等級為“110kPa/持續時間300秒”。延時透水壓(eWEP)測試可以確認透氣膜確實能夠承受規定的“壓力/持續時間”而不會發生問題。這表明，當該產品在實際應用過程中暴露于類似環境挑戰時，能夠可靠地發揮其性能。
為了評估透水壓，戈爾通常一并進行瞬時透水壓(iWEP)和延時透水壓(eWEP)驗證測試。這使我們的產品性能評估更加全面，從而可確保產品實際性能與預期性能一致。
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