Thanks for the replies everyone and useful tips. Have a few follow-up questions.
@daisy~
1. For cereal boxes, is the ink/coloring safe?
2. Do you by chance know or have a link on the difference between freezing versus baking for decontaminating items? I saw some posts here on freeze bedding or putting sand in the oven and curious on why it's one or the other.
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@MochiTheHammy
1. Is taking the free boxes and not using them for shipping legal? I couldn't find anything online about it. If it's fair game, this would be easy for me to do...just not sure on specifics.
@borkborkham
1. What temperature do you set the oven to?
2. My gut instinct feels that putting cardboard in an oven is a fire hazard...but it looks like it's commonly listed on this forum. Is it really safe to put cardboard in the oven? Do you have to monitor it closely?
Again, thank you all for spending your time helping me with this.
Cardboard self ignites at 427 F, while all bacteria and viruses dies instantly at around 210F, so I think its okay to bake cardboard in an oven that heats evenly. I still recommend you to keep an eye on it.(just incase something goes wrong). Heating it at 180 F or something for around 15 minutes should be enough.
If you're still worried, try spraying the cardboard with some water before baking it. Damp things are less likely to burn, but depending on how much you spray, it might need to be baked longer.
Also keep the cardboard away from oven's "hot zones". Just like how baked goods brown more quickly when they're closer to them, the closer you get to the hot zones, the more your cardboard will exceed the set temperature.
I don't usually bake my cardboards, but baking is something you can do if you really want to sanitize it.
Edited by borkborkham, 26 January 2022 - 03:59 PM.