I don't think Mexico is the cause of failures in insulated glass. I once owned a Four Seasons Solarium Franchise. The sealers are much better today than the were in the 80's. When repairing the failed panels we would find dried out and cracked sealing compounds. This is not a workmanship problem it was a product choice problem. There is another problem with insulated panels in a RV and that is altitude. If you are at sea level and go to the mountain and over a few passes you have that pressure at sea level trapped inside the panel flexing the glass outward.
Panels that had to cross mountain ranges had a small lead vent tube in them to relieve pressure. When we unpacked the glass we would crimp the vent tube closed.
Insulated glass panels are made with glass coming out of glass washing machines, the spacer with desiccant is installed on the glass then the second glass is put in place and a gun forces the sealant under pressure into the edge area of the panel.
If a panel is poorly manufactured or has a improper seal then the glass panel will usually fail within a few months. When it takes years then it can be seal material failure or even a poor design of how the frame compresses the glass unit or as mentioned earlier changes in altitude physically tearing the seal apart.
R-20 glass panel.
Tri-Film/Quad-Cavity Heat Mirror Insulating Glass using three Heat Mirror films suspended inside of an insulating glass unit, creating four air spaces, is the most energy-efficient glazing product in the world. With an optional Xenon gass filling, tri-film/quad-cavity Heat Mirror Insulating Glass can achieve an industry-leading U-value of 0.05 (R-value of 20). For home owners with demanding applications, or for those who want the best, Heat Mirror is the clear choice.
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