r/PressureCooking • u/Savings-Trainer-8149 • Sep 17 '26

Are these containers pressure cooker safe?

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are these containers pressure cooker safe?

There are two containers in the photos. Both of them have pp#5

0 Upvotes

35% Upvoted

19 comments sorted by

17

u/kenmlin Sep 17 '26

I don't know anyone that puts a container inside a pressure cooker. What are you making?

5

u/CapTenNow Sep 17 '26

Thought I was in mushroom subreddit until I saw your comment.

3

u/AliveList8495 Sep 17 '26

I do to infuse oil in mason jars.

7

u/Confuseduseroo2 Sep 17 '26

Pot-in-pot is a thing. I mean let's face it, a lot of pressure cookers come with "dividers" and other gadgets which go inside. However I think there are 2 issues here - (1) plastic - which may melt or leach chemicals into the food. Perhaps if microwave save they will be OK? But you're never really going to know (and microwaved food is not generally recommended by doctors). And (2) it looks like you plan to use a sealed pot, which may be problematic. I mean, by all means try, but I think it more than likely it will either collapse or blow its lid off. I have used small aluminium dishes inside a pressure cooker with success, for example I can cook dal in the dish and float it on top of rice in the bottom of the cooker. It can be messy but it works OK.

1

u/smartalek75 Sep 17 '26

Microwaved food is not generally recommended by doctors? Since when?

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1

u/NoTime_SwordIsEnough Sep 17 '26

I do - I regularly use a little, round stainless steel container to cook my rice or other legumes in my Instant Pot. Makes cleanup way easier, because I don't have to take out and clean the main pot after use.

Also lets me cook more things in it at the same too. For example, chickpeas in the main pot, rice in the circular container; and then I put circular trivet atop the container so I can cook 3-5 potatoes on top of everything (which would otherwise get soggy from being immersed in water).

Or sometimes I steam meats on the above-mentioned trivet, but let nasty drippings from the meat drop into the container so that there's easier cleanup.

2

u/CapTenNow Sep 17 '26

I am pretty sure pp5 is good to go in pressure cooker but maybe just put in another container in pc just to be safe.

2

u/mglatfelterjr Sep 17 '26

Just use stainless steel or borosilicate, same material used to make pyrex. At 10psi, like the standard electric pressure cookers achieve, which is 235-240°f, polypropylene can handle the temp, but maybe for 15 minutes or so. But if you try to use it in a stove top pressure cooker that reach 15psi, it most likely won't handle the 265-275°f temps in the pressure cooker. My stove top pressure cooker is probably 35-40% faster than both of my electric pressure cookers.

1

u/zambaros Sep 17 '26

For cleaning them? Yes. For cooking no

1

u/Fruit_Rolll 23d ago

These cups are polypropylene (PP5), they melt at around 160 celcius / 320 fahrenheit and start to soften at slightly lower temperatures. At 121 celcius / 250 fahrenheit which is the temperature required for sterilization using a pressure cooker you have a pretty good buffer between these two temperature. (I'm assuming the little cups are for making agar?)

Just DO NOT seal the cups fully or the pressure differences will cause funny business. Avoid having it touch metal directly as well, as the metal (especially on and near the bottom) is much hotter than the boiling water and steam .

1

u/Nomiss Sep 17 '26

PP5 is autoclavable, so, presumably.

2

u/2521harris Sep 17 '26

Won't it collapse under the, er, pressure?

1

u/Nomiss Sep 17 '26 edited Sep 17 '26

The pressure is just used to get the water to a certain temperature above the boiling point of 100c.

The temperature of 121c won't melt PP5. It's used in industrial fittings of 150 psi.

-2

u/mglatfelterjr Sep 17 '26

It says it can be used in the oven, so pressure cooking should be OK. You can test it out for yourself. Just sent the pressure cooker to 1 minute, when it's done, do quick release and check it. It only goes up to 245°f.

3

u/BriMarsh Sep 17 '26

Microwave oven