I am looking for capacitors in the range 10nF to 100nF (10V) with the tightest tolerance and thermally as stable as possible (but very tight tolerance has the priority).
So, you think an accurate capacitor is the
solution to your
problem. It may be, but if we knew your problem, we might be able to suggest better solutions....
In other words, don’t ask “Can you give me a lift into town?” Do ask “Can you give me a lift into town, so I can replace my broken frobnitz?”. The answer might be “There’s a spare frobnitz in the attic”, thus saving time, money, the environment – as well as making some space in the attic.