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I need to vacuum seal and compress two things together and then bake them at 300-deg F so they will bond.

Do high-temp vacuum bags exist? (silicone, etc)

I'm looking for something like these vacuum foodsaver ziplock bags, but they melt and the plastic bonds at about 280-deg F.

Ideas?

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    Do the items need to be in a vacuum or is it enough to compress them until baked without a vacuum? If you give us some more information about the objects and the process we might be able to provide more ideas. – Elmy Feb 12 at 5:45
  • Its a toner transfer transparency paper pressed against copper-clad FR4 board. It needs about 280-300 deg F for a few minutes to transfer. In this video they use an iron, but it is hard to get small traces with even pressure so we plan to put it under vacuum before applying the iron: youtube.com/watch?v=4N3Za3YLwoo – KJ7LNW Feb 13 at 23:30
  • You should look into Sous Vide bags, they generally require you to have your own vacuum sealer but the advantage of that is that you can make them any size you want. They are used for cooking in a hot water bath that is maintained at a reasonably high temperature. Though it wouldn't be good enough for going in the oven I don't think. – T.E.N Mar 2 at 0:25
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There are silicone sealable and reusable food storage bags like these that are good for over 400 degrees: Silicone Food Storage Bags Reusable (looks like this particular product isn't currently available at Amazon, but you can find similar items or they may come back into stock; at least it's clear that such products exist).

They are sealed with a channel that slides over the opening. What comes with it looks like plastic, so you would need to make a similar channel or clip out of metal or some other material that would withstand the high temperature. You would also need to figure out how to suck out the air and complete the sealing of it. It might require embedding a tube at one end of the opening, sealing the bag, evacuating it, then sealing the tube.

One other product I can think of that will take the temperature is Reynolds Oven Bags, which works in a 350F oven and comes in various sizes. Those are designed to be tied with a provided nylon string. It isn't clear how many uses you would get from a bag, but they're a lot cheaper than the silicone bags. Again, you would need to find a way to suck out the air and seal it. You could do something like wrap the opening around a tube, suck out the air, than tightly twist and tie the bag below the tube, perhaps folding the twisted area.

Creating an air-tight evacuation port in a sealable bag can be done, but is often a challenge. The OP reports a clever idea to solve this. Sous vide is a cooking method that involves sealing the food in a vacuum bag and cooking it in a water bath at a controlled temperature. Silicone bags are available for this purpose, and come with an evacuation port built-in. The OP found these Sous Vide Silicone Bags and reports that they worked.

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  • an interesting product, but high end temperature limit in the ad copy indicates 230 °F, lower than the OP requirements. – fred_dot_u Feb 12 at 11:18
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    @fred_dot_u, that spec is 230 C, not F. – fixer1234 Feb 12 at 11:27
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    @fixer1234, Actually I have silicone food bags, but the issue is that I need the vacuum orifice to evacuate the air. The circle in the top-right corner takes a tool like the one we have: amazon.com/FoodSaver-31161370-Cordless-Handheld-Vacuum/dp/… – KJ7LNW Feb 12 at 20:50
  • @fixer1234, my error. I saw no scale in the opening info, but see it now in the deep body of the advert. That's pretty impressive. – fred_dot_u Feb 13 at 0:18
  • @KJ7LNW, what about stuffing a silicone bag inside a FoodSaver™ type bag, pulling the air out, then using the seal on the silicone bag to close it and remove the outer bag? – fred_dot_u Feb 13 at 0:19
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You could use regular silicone zip-seal bags, like Stasher bags, which can sustain up to 400ºF, and then put them inside one of those vacuum-seal bags with the one-way valves, and use the valved bag like a mini vacuum chamber to vacuum the air out of the silicone bag before sealing it. People do this for sous vide cooking.

See this youtube video.

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