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What materials can be used to make the temperature sensor housing?

I have been studying temperature sensors recently, and I want to know which materials the temperature sensor housing can be made of. What is the best temperature sensor housing?
I originally contacted a company that made sensor housings elsewhere, called Suzhou Santian Precision Mould Manufacturing Co., Ltd. They told me that the plastic housing is the best among the temperature sensor housings. I am not very convinced, and I want to find more professional staff to help me answer.
Does anyone know anything about the temperature sensor housing?