So I did an internet crawl and found numerous references to the "UV resistance" of black zip ties.
Most black zip ties are just colored that way and are no better able to resist UV light than any other "box store" zip tie.
However, MS3367-XX Zipties ARE UV resistant. The trade name for these Zipties is Halar(c)
. They come in many colors including natural (off white).
Although weaker than general-purpose nylon 6/6 (about 37%), Halar is resistant to a wide range of chemicals such as concentrated hydrofluoric and sulfuric acids. It is radiation resistant. Halar also withstands high temperatures, ultraviolet light exposure and meets U.L. flammability requirement 94V-O. Its outstanding characteristic is a lower smoke density when burned. This makes Halar more desirable for use in areas where smoke generation is a concern.
(Like a cockpit or air plenum)
Note there is a mil spec for a UV resistant Ziptie that is not made of Halar but it has limitations as well and the MilSpec compliance will be on the package.
Nylon 6/6 - UV Stabilized - Mil Spec MS3368 for UV (On package)
General purpose nylon 6/6 with increased resistance to ultraviolet light. Carbon black is one of the most effective stabilizers known today. A uniform dispersion of carbon black provides good ultraviolet light resistance without adversely affecting physical properties. The addition of carbon black, or any other ultraviolet light stabilizer, prolongs the useful life of plastic products used outdoors, but it does not totally eliminate the destructive effects of the light.
I must emphasize that the package must quote the MilSpec, state UV resistant, and be Nylon bonded with Carbon Black and not a pigment. The Milspec UV resistant ties only come in UV Black.
The NSN for aviation is supposed to be the Halar Ziptie but the cheaper Carbon Black ones are a suitable sub.
(Edited and much more complete and correct)