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Sun Damage - According To Poynter's

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#1 andyhughes

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Posted 23 June 2010 - 07:25 PM

According to Poynters - percentage breaking strength lost of type-1 nylon fabric (i.e. canopy rip stop nylon):

Outdoors (summer sun):
1 week: 52%
2 weeks: 71%
3 weeks: 94%

Behind glass (summer sun):
1 week: 40%
2 weeks: 61%
3 weeks: 85%

Florescent strip lights (when in close proximity to the fabric) affect it about half as much as the sun.

Coloured fabric is more susceptible than white (i.e. figures above will be greater).

Webbing is also affected by UV.

You can sometimes spot sun damage by fading or colour changes - but the absence of this does *not* mean there is no sun damage. UV damage can be completely invisible to the naked eye.
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#2 andyhughes

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Posted 07 January 2014 - 11:12 AM

Mr Poynter continues...

"It is interesting to note that many sport parachutists pack outside in the sun and if we assume that their canopies are exposed 15 minutes each time, then after just 280 jumps the assembly has been in the sun an equivalent of seven 10 hour days, which is enough to lower the strength 50%. This does not count the 2 minutes per jump when the entire parachute is exposed or the time walking back to the packing area or the time before starting packing.

The parachute's exposure to the sun should be kept to a minimum"

The bottom line is that you should keep your rig out of the sun as much as possible - for strength and safety as well as to avoid colour fading.
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