The NSiC Nitride Bonded Silicon Carbide sheaths are commonly used as a protection sheath for Thermocouple Sensors which are commonly used in Incineration, Aluminium and Molten Metal industries. The sheaths offer good performance and are cost effective compared to Syalon (Si3n4), Silicon Carbide (NSIC) & Cast Iron sheaths. The NSiC sheaths are strong and have a high thermal shock resistance and high corrosion resistance properties.

The sheaths are suitable for use at high temperatures up to 1500°C. They are available in a variety of lengths and diameters, see the table below.


  • High bending strength
  • Good corrosion Resistance
  • High temperature tolerance 1400°C
  • Good Oxidation resistance
  • Superior thermal conductivity


Nitride Bonded Silicon Carbide (NSiC) Vs. Syalon (Si3n4)

  Nitride Bonded Silicon Carbide (NSiC) Syalon (Si3n4)
Application Aluminium Casting Aluminium Casting
Silicon Nitride (Si3n4) Content 21% 92%
Maximum Temperature 1400°C 1500°C
Estimated Lifespan 3-5 months 4-10 months
Price Lower Higher



Density 2.8 g/cm3
Porosity ≤16%
Phase composition β-Si3N4, Oxide
SiC 72%
Si3N4 21%
compressive strength 140MPa
flexure strength 35MPa
Thermal conductivity 16 w/m*k


Standard sizes (mm)

OD ID Minimum Length Maximum Length
16 8 300 600
22 12 300 200
28 16 300 1200
30 18 300 1200
45 25 300 1200