Cold Soaked Wing
I was recently "One-Step" deiced with Type I Porpylene fluid, other Types were inoperative. Wing fuel temperature was -20C, OAT was -10C with light snow. We estimated our holdover to be 12-15. We had some discussion about the effectiveness of Type I on a cold soaked wing and decided to do a Pre-Takeoff Contamination Check from the Cabin. Everything looked OK, so we launched.
Question: I'm curious to know if any of you have experienced, or have heard on instances where Type I fluid has frozen on a cold soaked wing? I understand Type I has some Propylene in it, but the mix is mostly hot WATER!