Yarn Storage
POY does not spoil on a date. It spends its shelf life at a rate the warehouse temperature sets.
— days
At the actual storage temperature and humidity
The Q10 and humidity factors are fitted constants, not physical laws — take them from your own texturising trials on aged lots, because they depend on the polymer, the spinning speed and how far from equilibrium the POY was wound. Manage stock first-in-first-out on the accelerated life, not on the nominal one.
POY Crystallisation & Shelf Life Modeler — free, with the formula and a worked example, at Textile School.