Re: FAA To Finally Ditch Floppy Disks & Win-95

c186282 <c186282@nnada.net> wrote:

On 6/15/25 11:00 PM, Rich wrote:

A little digging indicates that nylon's 'brittleness' temperature is
somewhere in the -50C to -60C zone.  So the typical temperature of
the environment is right in the "brittle zone" for nylon.  Then one
has to factor in the impact of vibration (which might cause a not
yet fully brittle nylon tie to shatter at -40C instead of -55C) and
I think we can see why nylon ties might not be aircraft rated.

 
  Borderline ...  but perhaps relevant.  Maybe not SO much for
  commercial craft, but decidedly for military and space apps.
 
  Other sources say that polyester cord has become the modern
  standard.  I've seen some info that says many polyesters are good
  to about -100c.  Good for aircraft, good for antarctic gear.

A -100C brittleness level leaves plenty of safety margin for operation
in -50C to -60C without worrying that your tie material is just on the
edge of failure from cold induced brittleness.  With Nylon having it's
magic brittle temperature right in the normal temperature range at
usual commercial altitudes, there is no safety margin at all.