Thermocouple exotic sheath materials


Sheath Material-



flex_armor

600 Inconel 177°C (2150°F)-

Most widely used thermocouple sheath material. Good high temperature strength, corrosion resistance, resistance to chloride-ion stress corrosion cracking and oxidation resistance to high temperatures. Do not use in sulfer bearing environments. Good in nitriding environments.

625 Inconel 982°C (1800°F)-

Excellent high temperature strength. Excellent resistance to pitting and crevice corrosion. Unaffected by radiation embrittlement.

Molybdenum 399°C (750°F) in air-

Refractory metal. Brittle, cannot be bent. Use only in inert, vacuum or reducing atmospheres. Most commonly used in BeO insulation and Tungsten Rhenium conductors. Un-compacted assemblies only.

Titanium 427°C (800°F)-

Lightweight, excellent strength in the 300F to 800F temperature range. Excellent resistance to oxidizing acids such as nitric or chromic. Resistant to inorganic chloride solutions, chlorinated organic compounds and most chlorine gas. Resistant to salt water spray and sea water.

400 Monel 538°C (1000°F)-

1000 F maximum in oxidizing conditions. Nickel-copper alloy with good corrosion resistance. Excellent resistance to sea water, hydrochloric acid and most alkalies.

Hastelloy B-2 538°C (1000°F) oxidizing, 816°C (1500°F) reducing-

Excellent resistance to hydrochloric acid at all concentrations and temperatures. Also resistant to hydrogen chloride, sulfuirc, acetic, and phosphoric acid.

Hastelloy C-276 1093°C (2000°F)-

Excellent corrosion resistance, especially in chlorinated environments. Resistant to ferric and cupic chlorides, solvents, chlorine, formic acids, acetic acids, brine wet chlorine gas and hypochlorite.

Copper OFHC 204°C (400°F)

Excellent thermal conductivity. Used in special applications for research and low temperature applications.

Tantalum 482°C (900°F) in air

Refractory metal. Very ductile. Use only in inert or very good vacuums. Most commonly used with BeO and Tungsten Rhenium conductors. Do not use in environments containing nitrogen above 700°F.

1100 Aluminum 316°C (600°F)

Commercially pure platinum. Used in special applications requiring good thermal conductivity.

Alloy 20 982°C (1800°F)

Generic version of Carpenter 20CB-3 developed specially for resistance to sulfuric acid.

 

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