Alternatives to dry ice in refrigerated freight

PC-16 and 21 are dry ice alternatives. More eco friendly and sustainable.

What's the average shelf life for these alternatives to traditional dry ice?

What are the most common applications and industries of use of the PC-16 and PC-21?

Considering availability, what are the advantages of PC-16 and PC-21 in terms of accessibility and availability in various markets or regions compared to dry ice?

Are there any limitations or drawbacks associated with PC-16 and PC-21 when compared to dry ice? How do these considerations factor into the decision-making process for their use?