CO2 in containers is funny stuff. It's actually sensitive to how full the container is between liquid and gas. Check out this chart. It actually shows that for a full cartridge cycommute's figures for the higher temperatures are low if the cartridges are filled to capacity;



It's an odd chart but if you look at the % fill line for 100% and go up to the 120F line the pressure is actually up around 1900 psi. And if the tops on the cartridges are set to blow off at around 2200 or so that is going to occur at around 130 by extrapolation since there's no temperature lines beyond 120.

The funny flat lines under the lowest curve are indicative of the bi-phase state where there's liquid and gas in the container at the same time. At temperatures and fill amounts in that area the pressure will remain constant over a wide range of fill amounts. But at around just under 90F the CO2 converts to all gas with no liquid content.

Mind you once you start to vent the gas off during use or in the event of a burst end cap the temperature will fall fast even on an overheated cartridge.