I also read (somewhere) that just the act of pulling on the nylon line, such as 
using if for anchor rode or dock line, causes internal heat from the fibers 
rubbing against each other (even when submerged), and will eventually cause a 
failure when enough strands separate from the heat.  I guess that's a good 
enough reason to replace them from time to time, whether they need it or not.
Sidney
Colorado Springs


> Date: Mon, 1 Dec 2008 13:56:06 -0800
> From: [EMAIL PROTECTED]
> To: [email protected]; [EMAIL PROTECTED]; [EMAIL PROTECTED]
> Subject: Re: [Liveaboard] Aging of Nylon line
> 
> "Lee Haefele" wrote:
> > Does heat age nylon or does it just age from time, or was it bad rope?
> 
> Sunlight, a combination of UV and heat, causes nylon line to stiffen.
> 
> Don't know if it also weakens it.
> 
> I changed out nylon dock lines every 3rd year while sailing on Lake Erie 
> (6 month season).
> 
> YMMV
> 
> Lew
> 
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