Flasking in jam flasks?

[HumbCa]

Hello, thanks for your help.

I have been propagating some orchids from seed fairly well using "proper" lab brand flasks like here:



However, these lab flasks are getting really expensive and hard to get, so the other day I was walking around my house and realized there's a distributor for what I call "jam flasks", because they're used for packaging jam that you can get in the supermarket. I went in and they even gave me a sample of their flasks:



They have those airtight caps for jam like these:


My main worry is that since these go in the pressure sterilizer, while lab flasks have an "inert plastic" lid, these have a metal lid with that gummy substance on the underside which could start releasing something that will affect/kill the orchids when heated.

If I'm just being paranoid, are these OK for orchid micropropagation in general? Has anyone had any experience using these or similar flasks for micropropagation?

Thanks, and I hope you have a nice weekend.