- Aug 22, 2021
I'm surprised this isn't the spec sheet for eternabond. 4910 normal tensile strength is 100psi and 4951 (used by AM Solar) is 85psi @ 200F. That's what the rating is in the data sheet for each tape. Lets do some math shall we? Each of my panels are secured with 2 T-Rails 48"x 3/4' = 72sqin, 72 x 100 = 7200lbs (>3.5 tons) @ 200F. Does anyone here really think that mechanical fasters in sheet aluminum will withstand 3.5 Tons? Does anyone think the aluminum sheet it self wont fail first? Even in shear the strength of both tapes is 70psi! There are 100's of panels on dozens of Airstreams using this install method with the only failure reported so far is when half the bolts are lost and only 2 brackets are left. Does anyone think that 2 brackets secured with standard fastening methods would not have failed in just as spectacular a fashion? WAKE UP!Had a hard time finding a datasheet on the VHB tapes, the US 3M website has a dead link. All they show is marketing crap and "For industrial/occupational use only. Not for consumer sale or use.". Awesome liability jargon.
Found this on the 3M UK website. Check out this crazy drop in tensile adhesion once it gets to only 50 F. The tape will face 170 F easily on a sunny summer day, on the roof of a trailer or RV. Meanwhile its down to 10% strength.
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