Canopy Colors and wear??

[skymedic 0]

That was easy
marc
"...a mind stretched with new idea's will never regain its shape"

[billvon 2,989]

Quote

it's a decent test: yes the windows attentenuate the uv itensity. only meaning exposure time needs to be increased. the area gets full unobstructed sunlight all day, and after a year the fabric even with the filtering of the single pane windows has taken more uv abuse that a normal canopy used in skydiving.

I think I'd disagree with that. It's certainly going to get a lot of UVA, but it's not going to get a lot of UVB, because window glass is opaque to it. If canopies are damaged purely by UVA then it might be a valid test, but because far UV is more damaging, generally, than near UV, I think "outside" UV would be much, much worse.
-bill von

[cobaltdan 0]

soda lime float glass can transmit, at high attenuation, uv down to just below 220 nm, well below the 300-400nm black light region. the thinner the glass the less the attenuation.
the lower uv is there just at much lower intensity, because most of it, not all gets absorbed by the glass.
as to weather or not the uv intensity is low enough to be below any damage threshold of the fabric after being filtered by window glass is valid question.
the outdoor flag suggestion should answer most questions here (but will take at least a few months).
sincerely,
dan

[piisfish 140]

There was a post with a report of extensive sun exposure testing on fabrics. Anybody can help me find it ?

scissors beat paper, paper beat rock, rock beat wingsuit - KarlM

[leon.hill 1]

I have it as a power point presentation. It is too large to post here, message me and I will figure out how to get it to you via email.

[leon.hill 1]

found it...http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CB4QFjAA&url=http%3A%2F%2Fwww.apf.asn.au%2FArticleDocuments%2F145%2FZP-Fabric_Color_and_Strength_Endurance_06-07.ppt.aspx&ei=g75YVIH0NffbsAStroKoAg&usg=AFQjCNEvKJ2gNXSUYkxzGTX2vhrWnCA2-w&sig2=y7rm1DR4OpZlwUSHY_A_ug&bvm=bv.78677474,d.cWc

or if you dont want to click the link, google "ZP Fabric Sunlight Exposure and Durability", it's the first result.

[mxk 1]

leon.hill

found it...http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CB4QFjAA&url=http%3A%2F%2Fwww.apf.asn.au%2FArticleDocuments%2F145%2FZP-Fabric_Color_and_Strength_Endurance_06-07.ppt.aspx&ei=g75YVIH0NffbsAStroKoAg&usg=AFQjCNEvKJ2gNXSUYkxzGTX2vhrWnCA2-w&sig2=y7rm1DR4OpZlwUSHY_A_ug&bvm=bv.78677474,d.cWc

That doesn't have all the slides. The rest is posted here:

http://www.dropzone.com/cgi-bin/forum/gforum.cgi?post=3131726#3131726

[piisfish 140]

Thanks to both

scissors beat paper, paper beat rock, rock beat wingsuit - KarlM

[stayhigh 2]

I've heard that lime green, and neon yellow, pink, and orange lasts the longest, since they reflect most of the UV rays.

Bernie Sanders for President 2016