Silicone O-rings used in kettle conversion kits

[epikuryan]

Hello,
I want to mount a wellderless kettle conversion kit to my kettle. To do that o-rings are needed to be installed at the spacings between the valve and kettle wall.
After the kit is installed to the kettle, those o-rings will be in contact with the kettle. And when boiling the mash, the kettle's metal temperature will increase a lot (since the valve will be installed to a close point to the bottom -which has the highest temperature-).
Is there a possibility that the orings will be deformed/melted because of the very high temperature? Or is there a possibility that the orings may release harmfull chemical when exposed to such high temperatures?

Thanks

 

[BrewSavage]

The metal won't get much hotter than the wort.

 

[epikuryan]

The metal won't get much hotter than the wort.

That is strange because since the hole and o-ring is close to the bottom and heat (while boiling) and they are in touch with the wort, I expect it to be much higher than the wort.

To be exact, the max temperature for silicon is 200C. Should I expect that the oring to be exposed to such temperature?