1、密封膠擠壓不實或含有機械雜質。
1, sealant extrusion is not solid or contain mechanical impurities.
中空玻璃與鋁管間隔體之間用兩道彈性密封膠粘結，第一道采用丁基橡膠密封，第二道采用結構硅酮膠密封。實際生產過程中，如果密封膠中存在機械雜質或涂膠過程中擠壓不實，致使膠體內部存在毛細管，并在間隔層內外壓差或濕度差的作用下，空氣中的水分進入空氣層，使中空玻璃間隔層中含水量增加。
Two elastic sealants are used between the insulating glass and the aluminum tube spacer. The first one is sealed by butyl rubber, and the second one is sealed by structural silicone. In the actual production process, if there are mechanical impurities in the sealant or improper extrusion during the coating process, resulting in the existence of capillaries in the colloid, and under the action of pressure difference or humidity difference inside and outside the spacer, moisture in the air into the air layer, so that the water content in the insulating glass spacer increases.
2、水汽通過密封膠進入間隔空氣層。
2. Water vapor enters the separated air layer through sealant.
密封膠一般為均勻高分子聚合物，其兩側由于逸度差（壓差或濃度差）的存在，成了聚合物做等溫擴散的驅動力。對于正通達中空玻璃設備的密封膠而言，主要擴散物就是空氣中的水分。
Sealant is generally a homogeneous polymer, its two sides due to the existence of fugacity difference (pressure or concentration difference), become the driving force of isothermal diffusion of polymer. For the sealant which is accessible to insulating glass equipment, the main diffuser is moisture in the air.

3、干燥劑的有效吸附能力低。

3. The effective adsorption capacity of desiccant is low.
對干燥劑的要求是不但要吸附掉中空玻璃密封單元在組裝過程中密封于空氣中的水分，使得中空玻璃有合格的初始露點，還要不斷地吸附通過膠層擴散到空氣層中的水分，繼續保持符合使用要求的露點。如果干燥劑的吸附能力差，不能有效地吸附通過擴散進入空氣層中的水份，就會導致水份在空氣中聚集，水分壓提高，中空玻璃的露點上升。
The requirement of desiccant is not only to absorb the moisture sealed in the air by the sealing unit of hollow glass in the assembly process, so that the qualified initial dew point of the hollow glass can be obtained, but also to continuously absorb the moisture diffused into the air layer through the adhesive layer, and continue to maintain the dew point which meets the requirements of use. If the desiccant adsorption capacity is poor, can not effectively adsorb through the diffusion of water into the air layer, it will lead to moisture accumulation in the air, water pressure increases, the dew point of the hollow glass rises.
4、如果中空玻璃設備中出現水汽，那么中空玻璃設備大氣環境中的潮氣能通過兩片玻璃間的密封膠逐漸滲透進中空玻璃設備內部的空間層。因此我們在使用中空玻璃設備時需要在中空玻璃內部裝有干燥劑以吸收這些進入的水氣。但如果干燥劑吸收水氣的能力有限，或者甚至中空玻璃間的密封膠已經和玻璃脫開的話，那么中空玻璃內部就會積聚越來越多的水氣，直到隨著溫差和濕度的變化，就會出現水的積聚，這種現象專業術語為"中空玻璃失效".
4. If water vapor appears in the hollow glass equipment, the moisture in the air environment of the hollow glass equipment can gradually penetrate into the inner space layer of the hollow glass equipment through the sealant between the two pieces of glass. Therefore, when we use the hollow glass equipment, we need to install a desiccant in the hollow glass to absorb the water vapor. But if the desiccant's ability to absorb water vapor is limited, or even if the sealant between the hollow glass has been removed from the glass, more and more water vapor will accumulate inside the hollow glass until water will accumulate as the temperature difference and humidity change. This phenomenon is termed "hollow glass failure".
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