> Thanks for the UV tests on the material and two types of tape. It is good to see the LDPE Space Blanket material holds up. I suspect mylar Space Blanket would also hold up well, since NASA wraps it around satellites. UV is much worse in space.
> I have a question about the tape tests. Did you have any 8959 on the underside of the Heatsheet? If so did you see loss of holding properties for 8959 not directly exposed to the sun?
I just finished a new tape test - this time it was only one month on the roof of the fort, but the sun and heat were obviously more intense this time around. Since you had asked, Al, 8959 works fine on the underside of the LDPE. I didn't notice any degradation.
8959 does not work well anywhere it's exposed UNLESS it's covered with 2120. By itself, it not only delaminates, but also the filaments weaken significantly. However, I saw minimal degradation in the 2120.
Keep in mind this is for long-term UV exposure. It's pretty uncommon for someone here to leave their tarp up during midday sun for any length of time, so I'd still expect 8959 to work fine for tieouts for quite some time under "normal" use.
However, I'm wondering if 8959 is even needed though. I couldn't rip through the 2120 tieout with Triptease. It was ~1/2" wide (1/4 width of the roll) and 2 layers on the actual loop portion. If you're using thinner guylines, you may need more strength. If that is so, I bet normal strapping tape (covered in 2120) would be just as good (and cheaper) than 8959. I don't see any need for the bi-directional strength.