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Most of the time when this happens, it is caused by impurities in the glass when it is made, referred to as “inclusions”. It’s usually a tiny speck of iron that begins to rust, expanding in the process, until it creates too much pressure in the glass & eventually it shatters. The inclusions are usually too small for you to notice at a casual glance. It happens more often with lower quality glass & as we all know, the RV manufacturers don’t buy the best quality components, just the cheapest ones that will get the job done.
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