Making Liquid CO2

I recently saw a video on making liquid $\ce{CO2}$: https://www.youtube.com/watch?v=8AN_XMcD3yI

Basically we seal some dry ice in a container. As the dry ice sublimates the pressure inside the container increases and so at about 5 atm we reach the triple point of $\ce{CO2}$, at which point the solid $\ce{CO2}$ melts instead of sublimating.

At some point in the video, the teacher cautions that the same experiment should not be done with a Gatorade bottle (similar to a water bottle). However, I'm not sure why this is the case.

Certainly the usual "dry ice bomb", which also has warm water poured into the sealed bottle, is not a good idea. In the present scenario, once all of the solid $\ce{CO2}$ had melted and the liquid $\ce{CO2}$ then goes into the gas phase, the increase in pressure could lead to an explosion: isn't this the same principle as in the case of the "dry ice bomb"? Is the warning because a Gatorade bottle (or water bottle, etc.) cannot withstand 5 atm of pressure?

• I'd say the plastic bottles go below their glass temperature and have very low strength in their glassy phase whereas a pyrex bottle would have thermal stability to maintain strength but I don't know the temperature involved and it would depend on which plastic a bit. It may even be chemical damage of the plastic. – user2617804 Jul 30 '15 at 5:21
• @user2617804 you should add that as an answer. It didn't even occur to me to consider the effects of temperature on the plastic. – chipbuster Jul 30 '15 at 16:00