Subject: What is the PSI upper limit for a 2 liter PET carbonated drink bottle?

At work, we recently began using dry ice in packaging poultry products, 
so, just for fun, I assembled a device from a pressure control regulator 
valve and a pressure gauge. Using empty 2-liter PET plastic soft drink 
bottles I've been experimenting with making carbonated drinks by dropping 
dry ice pellets in the PET bottle filled with ice cold liquid, and then 
attaching my device to the bottle to force carbonation into the fluid.

I have emailed my query to several soft drink companies and also to 
manufacturers and distributors of PET plastic bottles, and also to a 
couple of plastic engineering firms. I've not received any replies from 
any of my queries to date.

Could you tell me at what PSI the common two liter PET bottle used for 
carbonated soft drinks would explode.? [ Before I built my pressure 
regulator device, I blew up a couple of PET bottles by dropping a dry ice 
pellet into it and then screwing down the bottle cap ] Do you happen to 
know what the average finished PSI is in common  2 liter PET soft drink 
bottles purchased from any grocery?

Thanks,    Lesa Motz, Motz Poultry Company, Batavia, Ohio

Re: What is the PSI upper limit for a 2 liter PET carbonated drink bottle?