Solar installation - Page 2 - Fiberglass RV

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Old 11-07-2011, 07:38 PM   #15
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Trailer: 1980 Burro
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Originally Posted by Perry J View Post
I know the tape is waterproof but it's also made on a foam base.

Originally Posted by Byron Kinnaman View Post
Also it's not adhesive on foam, the whole things is adhesive and waterproof.

Thanks to Brian B-P for the link below. There seems to be some confusion about the VHB tape construction. Some quotes from the manufacturer about several types of VHB tape are shown below from page 2 of the link. All the tapes except the clear are adhesive on a foam base. The foam is closed cell so it is waterproof.

4941 This family utilizes multi-purpose acrylic adhesive on both sides of conformable foam

5952 This family matches the modified acrylic adhesive on both sides of very conformable foam

4950 This family has general purpose adhesive on both sides of firm type foam

4945 This family has multi-purpose adhesive on both sides of firm foam

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Old 11-07-2011, 08:58 PM   #16
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Name: George
Trailer: Waiting for the Sprinter van and designing the converion modules.
Posts: 629
VHB shelf life.

Be aware of 2Y shelf life of VHB tape and related price variability. The same tape on e-Bay or Amazon can vary by tenfold. I used Gray 4941F 0.045 in my solar install. Before buying you could verify manufacturing date before the actual purchase.
I copied the following text from 3M site:
Shelf Life
All 3M VHB Tapes have a shelf life of 24 months from date of manufacture when stored at 40F to 100F (4C to 38C) and 0-95% relative humidity. The optimum storage conditions are 72F (22C) and 50% relative humidity. Performance of tapes is not projected to change even after shelf life expires; however, 3M does suggest that 3M VHB Tapes are used prior to the shelf life date whenever possible. The manufacturing date is available on all 3M VHB Tape cores as the lot number. The lot number, typically a 4 digit code, is a Julian date (Y D D D). The first digit refers to the year of manufacture, the last 3 digits refer to the days after January 1. Example: A lot number of 9266 would translate to a date of manufacture of Sept. 22 (266th day of year) in 2009. On most products this is found as the 4 digits after the 9 following the product number. For tapes printed continuously around the core (e.g. 3M VHB Tape 5952 family) the lot number typically will be the string of 4 digits preceding the product number.

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