Saint Gobain Specialty Ceramics' products allow customers to solve tough problems in thermal and chemical processing, industrial metrology, temperature...
NB SiC Thermocouple Protection Tubes
Nitride bonded silicon carbide (NB SiC) tubes offer an economical choice for thermocouple sensor OEMs.
These tubes can be produced to a large range of outer and inner diameters with several options for mounting. NB SiC does not contaminate non-ferrous melts, like cast iron tubes. It is also a popular choice in solutions for temperature measurement in heat treating furnaces.
- Less than 12% porosity, with surface porosity of less than 1% +
- Maximum service temperature of 1,450 °C
- Economical choice
- Non-ferrous furnaces
- Heat treatment furnaces
N-Durance®
| Properties | Unit | Spec. | Typical Values |
| Bulk Density | g/cc | >2.75 | 2.80 |
| Apparent Porosity | % | <12 | 8 |
| Surface Porosity | % | <1 | 0.5 |
| Cold Modulus of Rupture (at room temperature) | MPa | >150 | 160 |
| Hot Modulus of Rupture (at 1,400°C) | MPa | >140 | 180 |
| Modulus of Elasticity | GPa | 240 | |
| Thermal Conductivity (at 1,000°C) | W/m.K | 20 | |
| Co-efficient of Thermal Expansion | °C | 4.4x10-6 | |
| Maximum Service Temperature | °C | 1,450 |
Refrax® 20E
| Properties | Unit | Typical Values |
| Bulk Density | g.cm-3 | 2.20 |
| Apparent Porosity | % | 28 |
| Modulus of Rapture ar 20°C | N.mm-2 | 25 |
| Thermal Conductivity at 1,000°C | W/m-1.K-1 | 18.5 |
| Abrasion Resistance - BS1902 | cm-3 | 80 |
Cryston® 789A
| Properties | Unit | Typical Values |
| Bulk Density | g.cm-3 | >26.2 |
| Apparent Porosity | % | <16 |
| Modulus of Rapture at 20°C | N.mm-2 | >165 |
| Thermal Conductivity at 1,000°C | W/m-1.K-1 | 15.5 |
| Abrasion Resistance - BS1902 | 10-6/°C | 5.1 |
STANDARD DIMENSIONS OF NBSiC TUBES*
* Technical data, right of modification reserved
| OD | ID | Length | |
| N-Durance® | 20 - 50 mm | 8 - 26 mm | Up to 1100 mm |
| Refrax® 20E | 20 - 90 mm | Wall 4 - 10 mm | Up to 1600 mm |
| Cryston® 789A | 25 - 40 mm | 12 - 27 mm | Up to 1500 mm |
