I was wondering the same thing. I used nylon twine to hold up my roof mounted 40m vertical when I lived in Phoenix and the stuff lasted for well over ten years without any noticeable degradation in strength even under that brutal sunlight, but every single molded nylon part of any kind that I ever used for anything outdoors would become brittle and crack in roughly a year. Unless the item description specifically stated that it was UV stabilized I personally wouldn't trust it. The current description only says that they are "surplus" parts that KF4TAP discovered somewhere and thought they might be usable as spreaders .... http://sites.google.com/site/kshamradioparts/home/keith-s-blog/newitem
73, Dave AB7E On 5/13/2010 10:07 AM, Wes Stewart wrote: > How did we get from solid spacers to rope? > > http://www.sdplastics.com/ultravioletresistance.html > > --- On Thu, 5/13/10, Tom W8JI<[email protected]> wrote: > > From: Tom W8JI<[email protected]> > Subject: Re: [Elecraft] OT: Ladder Line Spacers > To: "Wes Stewart"<[email protected]>, [email protected], "Ken > Kopp"<[email protected]> > Date: Thursday, May 13, 2010, 3:03 AM > > The dissipation factor of Nylon is about two orders of magnitude greater than > polyethylene and the UV resistance is horrible. > > Wes N7Ws>> > > None of that may matter because the electric field strength in the insulator > is probably low and almost all nylon has UV inhibitors now. > > The rope I use for antennas is nylon and it lasts a very long time in the > Georgia sun. > > You have to look at the material characteristics of the particular nylon > material for UV life, and the end application for dissipation factor > problems. Even 100 times nothing might still be considered nothing. > > 73 Tom > > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
