all the ingredients for a chemical reaction are in place,
something is bound to happen, however slowly. Which means
that, unless you can completely remove one of the reagents,
there no effective means of completely stopping a reaction.
rather casts doubt on the concept of a "safe barrel
temperature" for injection moulding or extrusion. What
you perceive as safe temperature is only that
temperature where there is no perceptible effect for the
residence time concerned. Increase the residence
time, and that temperature may be no longer "safe".
So if there are any interruptions to production which impact
on residence time, turn the barrel temperature down.