I saw this quote in a FAQ on the Skydrol website. I was wondering how do they figure that 5% contamination is a worst case scenario?
Skydrol.com - Frequently Asked Questions
Q: What happens when fuel is contaminated by hydraulic fluid?
A: In laboratory tests, concentrations of up to 5% Skydrol in jet fuel were cooled to -30oF. No gel formation or any other effect was observed. 5% is the maximum concentration possible in the worst case of a leak in a fuel tank heat exchanger.