Not durable. About as breakable as the front side. The backs of mine are just a thin plastic coating..
Solar Back Sheet, PV Back Sheet; Solar Cell Back Sheet material designed for high dielectric strength and weatherability - Dunmore Corp
A good wack from either side, is going to break the glass and you can kiss it goodbye..
http://ecorenovator.org/forum/45979-post52.html
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My hobby is installing & trying to repair mini-splits
EPA 608 Type 1 Technician Certification ~ 5 lbs or less..
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