Commonly used sheath materials for industrial sensors and their recommended service are as follows:

	Brass. Used for low-temperature commodity applications in mild environments such as air or water temperature measurements.
	304 stainless steel. Good corrosion-resistant characteristics and adequate for most common corrosive agents encountered in industry; service temperatures up to 900°F; advantages for machined housings.
	316 stainless steel. The most corrosion resistant of the common stainless steels; increased corrosion resistance to non-oxidizing acids such as sulphuric, phosphoric, and acetic; service temperature up to 900°F; standard on RdF industrial probes and capsules.
	Inconel 600. Better high-temperature corrosion resistance than stainless steels; pre-oxidized sheaths for temperatures up to 1500°F; optional on RdF industrial probes.