I had problems with some of the polyurethane tubing after a few years.
Especially if it was sitting.
It would crackle, like safety glass.
I've been testing/using tygothane lately.
Thanks for the tip. I will keep an eye on it and maybe try some Tygothane.
As far as I can tell from cruising the sites, Tygothane is a polyurethane plastic. There are more than one kind with different characteristics. It is a trade name mix of Tygon and polyurethane, hence "Tygothane".
Here is an excerpt from one of those site:
"TYGOTHANE® Precision Polyurethane Tubing
Tygothane® is TYGONs® prescision polyurethane tubing made from a tough ester-based polyurethane. It is ideal for applications that require tight dimensional tolerances. TYGOTHANE® C-210-A is designed for applications where tight tolerances must be held. It has excellent abrasion resistance as well as excellent resistant to oils, greases, and fuels. The temperature range of C-210-A allows the material to stay flexible in sub-zero environments. It also has high tear resistance and is FDA compliant making it viable for a wide variety of applications......."