Protection Sheath Material Datasheets

Materials specification for temperature sensor protection sheaths

Our temperature sensors are specifically designed for many different types of harsh and reducing atmosheres and therefore we supply protection sheaths suitable for each application. Here is a list of datasheets for the materials that we supply and use. This list is available as a PDF. Click on the material names for more information.

Mild Steel	4C54, Ferritic, 446 SS	Platinum Grain Stabilised
321 SS	Sanicro 31 HT®	Hastelloy C276
310 SS	Alloy 600 (Inconel®)	Kanthal AF, Kanthal APM
316 SS	Alloy 800 HT (Incoloy®)	Recrystalised Alumina (Alsint)
353 MA®	Platinum 10% Rhodium	Aluminous Porcelain (Pythagoras)
253 MA®	Kanthal Super	Silicon Carbide (Clay Bonded)
Pyrosil	Sillimanite 60	Silicon Carbide (Recrystalised)
Platinum	Quartz	Monel 400
Cast Iron	Brass	Hastelloy B2
Syalon 101	Platinum 10% Rhodium Grain Stabilised

321 SS
Commonly called 18/8. Excellent corrosion resistance and remains ductile. Used for MI sheathing for type J and Pt 100’s. Withstands hot crude oil products, steam and combustion gases. Carbon dioxide to 650 ° C. Air up to 900 ° C without temperature variation.

Basic Composition	Cr 18%, Ni 9%, Mn 2%, Si 1%, C 0.1%, Bal Fe
Temperature Limits	800 ° C
International Standards	BS 970 321 S31, W No 1.4541
Density	7.9 g/cm³
Melting Range	Approx 1400 ° C
Specific Heat	500 J/Kg ° C
Coefficient of Expansion	17 x10-6 / ° C
Thermal Conductivity	14.7 W/m ° C
Peak Sensors Colour Code	Silver

310 SS
Commonly called 25/20. Good oxidation resistance and resistant to sulphur and reducing atmospheres. High temperature sheathing. Carbon dioxide to 900 ° C. Continuous operation in air up to 1150 ° C, without temperature variation. Not recommended for use continuously between 550 ° C and 850 ° C.

Basic Composition	Cr 25%, Ni 20%, Mn 2%, Si 2%, C 0.02%, Bal Fe.
Temperature Limits	1100 ° C
International Standards	BS 970 Grade 310 S31, W No 1.4841
Density	7.9 g/cm³
Melting Range	Approx 1400 ° C
Specific Heat	500 J/Kg ° C
Coefficient of Expansion	16.5 x10-6 / ° C
Thermal Conductivity	14.7 W/m ° C
Peak Sensors Colour Code	Silver

316 SS
Excellent corrosion and pitting resistance. Similar to 321 SS but with better acid resistance. Usually used in chemical plants and many other industrial applications.

Basic Composition	Cr 17.5%, Ni 12.5%, Mn 2%, Si 1%, Mo 2-2.5%, C 0.03%, Bal Fe.
Temperature Limits	800 ° C
International Standards	BS 970 Grade 316, W No 1.4401
Density	7.9 g/cm³
Melting Range	Approx 1400 ° C
Specific Heat	500 J/Kg ° C
Coefficient of Expansion	17 x10-6 / ° C
Thermal Conductivity	14.7 W/m ° C
Peak Sensors Colour Code	Silver

353 MA ®
Very good resistance to oxidation, combustion gases and carburisation. Good resistance to nitriding gases. Excellent in petrochemical furnaces including cracked ammonia.

Basic Composition	Cr 25%, Ni 35%, Si 1.6%, Mn 1.5% Max, N 0.16%, C 0.05, P 0.04 Max, S 0.03 Max, Ce 0.05, Bal Fe
Temperature Limits	1175 ° C
International Standards	UNS S 35315
Density	7.89 g/cm³
Melting Range
Specific Heat	450 rising to 670 J/Kg ° C
Coefficient of Expansion	18.5 x10-6 / ° C
Thermal Conductivity	11 rising to 28 W/m ° C
Peak Sensors Colour Code

Sanicro 31 HT®
Performs well in salt baths for heat treatment, cyanide or neutral salt baths.

Basic Composition	Cr 21%, Ni 31%, Si 0.6%, Mn 0.6%, Ti 0.5%, Al 0.5%, C 0.7, S 0.03, P 0.015 Max, S 0.01 Max, Bal Fe
Temperature Limits	1100 ° C Max in air or oxidation gases
International Standards	N 08811/N08810, W Nr 1.4959 (W 1.4876)
Density	7.9 g/cm³
Melting Range
Specific Heat	460 rising to 680 J/Kg ° C
Coefficient of Expansion	18.5 x10-6 / ° C
Thermal Conductivity	11.6 rising to 31 W/m ° C
Peak Sensors Colour Code

253 MA ®
Very good resistance to oxidation, combustion gases and carburisation.

Basic Composition	Cr 21%, Ni 11%, Si 1.7%, Mn 0.8% Max, N 0.17%, C 0.08, P 0.04, S 0.03, Ce 0.05, Bal Fe
Temperature Limits	1150 ° C Max in Air, oxidation and carburisation.
International Standards	1.4835, S 30815, W Nr 1.4893
Density	7.8 g/cm³
Melting Range
Specific Heat	440 rising to 690 J/Kg ° C
Coefficient of Expansion	16 rising to 24 x10-6 / ° C
Thermal Conductivity	14.5 rising to 29 W/m ° C
Peak Sensors Colour Code	Pink

Alloy 600 (Inconel®)
A strong oxidation resistant material at high temperatures, particularly with cycling. Good resistance to carburisation. Resists sulphur compounds and carbon dioxide to moderate temperatures only. Excellent neutral and alkaline salt bath resistance Good in many acid salt baths. Good for nitriding atmospheres.

Basic Composition	Ni 72% Min, Cr 14-17%, Fe 6-10%.
Temperature Limits	1100 ° C
International Standards	W No 2.4816, UNS N06600
Density	8.472 g/cm³
Melting Range	1354 to 1413 ° C
Specific Heat	444 J/Kg ° C
Coefficient of Expansion	10 rising to 16 x10-6 / ° C
Thermal Conductivity	15 rising to 27 W/m ° C
Peak Sensors Colour Code	Red

Alloy 800 HT (Incoloy®)
Resistance to high temperature corrosion. Excellent oxidation and carburisation resistance. Reasonable sulphur resistance at moderate temperatures Alloy 800 and Alloy 800 H are very similar but they have lower creep rupture strength at temperature.

Basic Composition	Ni 30-35%, Cr 19-23%, Fe 39.5% Max,
Temperature Limits	1100 ° C
International Standards	W No 1.4876, UNS N08811
Density	7.945 g/cm³
Melting Range	1357 to 1385 ° C
Specific Heat	460 J/Kg ° C
Coefficient of Expansion	14 rising to 18 x10-6 / ° C
Thermal Conductivity	11 rising to 32 W/m ° C
Peak Sensors Colour Code

Pyrosil
MI Thermocouple types K and N sheathing. Better oxidation resistance than Alloy 600 .

Basic Composition	Ni Cr Si
Temperature Limits	1250 ° C
International Standards
Density
Melting Range
Specific Heat
Coefficient of Expansion
Thermal Conductivity
Peak Sensors Colour Code

Monel 400
Resists sea water, steam, salt and caustic solutions. Used in heat exchangers. Other Monel available.

Basic Composition	Ni 67%, Cu 28%, F3 3%, Mn 2%
Temperature Limits	0 to 480 ° C
International Standards	UNS N00440
Density	8.84g/cm³
Melting Range	1320 ° C
Specific Heat	430 J/Kg ° C
Coefficient of Expansion	14 x10-6 / ° C
Thermal Conductivity
Peak Sensors Colour Code

Hastelloy C276
Corrosion resistance in reducing and oxidising atmospheres. Severe environments. Maintains corrosion resistance after welding.

Basic Composition	Ni 57%, Mo 16%, Cr 15.5%, Fe 5.5%, W 3.8%
Temperature Limits	1040 ° C
International Standards	UNS N10276
Density	8.9g/cm³
Melting Range	1325 - 1370 ° C
Specific Heat
Coefficient of Expansion	12.8 x10-6 / ° C
Thermal Conductivity	High
Peak Sensors Colour Code

Hastelloy B2
Significant resistance to reducing environments, and many acids.

Basic Composition	Ni 68%, Mo 28%, Fe 2%, Co 1%, Cr 1%.
Temperature Limits	815 ° C
International Standards	UNS 10665
Density
Melting Range
Specific Heat
Coefficient of Expansion
Thermal Conductivity	High
Peak Sensors Colour Code

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