Hexoloy® SE Sintered Silicon Carbide Tubes and SA Tube Sheets

Silicon Carbide Tube Sheets for Shell and Heat Exchangers

Saint-Gobain Performance Ceramics & Refractories boasts over 30 years’ experience in the chemicals industry and is currently the only manufacturer of silicon carbide products for shell and tube heat exchangers.

Hexoloy® SE silicon carbide tubes are the most reliable choice for shell and tube heat exchangers employed in fine and specialty chemicals, offering virtually universal corrosion resistance, high thermal conductivity, extremely high hardness and excellent mechanical strength.

Hexoloy® SE sintered silicon carbide tubes are extruded products, available in 8 mm, 12.7 mm, 14 mm and 19 mm outer diameters, and lengths up to 4.5 m. Tubes are used in conjunction with tube sheets (PTFE, PFA lined steel, or SiC) and a series of baffles placed inside a steel or glass shell.

Tubes undergo a rigorous quality control and inspection process, including hydrotesting of every tube at 165-186 bar. Hexoloy® SE tubes have exceptionally thin walls, resulting in high heat transfer when used in a heat exchanger application.


Hexoloy® SA silicon carbide tube sheets are also available in a range of diameters and thicknesses.

Benefits
  • Non-fouling
  • High strength
  • Ultra-long service life
  • Excellent thermal conductivity
  • Universal corrosion resistance
  • Extreme hardness and wear resistance
  • Lowers operating and maintenance costs over the life of the product Improves efficiency by reducing down time and maintenance
  • Meets strict chemical industry standards worldwide
Applications
Specialty-ceramic-hexoloy-application

 

 

Material Properties
Physical Properties Units SE
Composition (phases)   SiC
Density g/cm3 3.05
Grain Size microns 4-10
Hardness (Knoop)* kg/mm2 2800
Flexural Strength
4pt. @ RT
MPa
x10lb/in2
280
40
Compressive Strength @ RT MPa
x103 lb/in
3900
560
Modulus of Elasticity @ RT GPa
x106 lb/in
420
60
Weibull Modulus (2 parameters)   10
Poisson Ratio   0.14
Fracture Toughness @ RT
Double Torsion & SENB
MPa/√m
103b/in2/√in
4.60
4.20
Coefficient of Thermal Expansion
RT to 700°C
x10-6mm/mm°K
x10-6in/in°F
4.02
2.20
Max. Service Temp (air) °C
°F
1900
3450
Mean Specific Heat @ RT J/gm°K 0.67
Thermal Conductivity @ RT W/m°K
Btu/ft h°F
157.3
90.9
@ 200°C   107.2
62.0
@ 400°C   77.3
44.7
Permeability RT to 1000°C   All impervious to gases over 31 MPa

Electrical Resistivity @ RT***
                                 @ 1000°C

ohm-cm 102-108
0.01-0.2
Emissivity   0.9

* Knoop 100-gm load
*** Dependent upon dopants in Hexoloy SE SiC that will decrease electrical resistivity to a desired range.
N/A = Not applicable or not available

Size

Hexoloy® SE sintered silicon carbide tubes are extruded product available in 8 mm, 12.7 mm, 14 mm, and 19 mm outside diameter, and lengths up to 4.5 m. Tubes are used in conjunction with tube sheets (PTFE, PFA lined steel, or SiC) and a series of baffles placed inside a steel or glass shell.

FAQ

What are the key benefits of using Silicon Carbide Tubes?

Hexoloy® Silicon carbide is essentially inert to a wide range of corrosive chemicals, including strong acids and caustics, up to 200°C. Most alternatives, such as graphite, metals, alloys, introduce contamination over time from corrosion. Other key benefits include high heat transfer, superior mechanical strength, and low thermal expansion.

Does Saint-Gobain Performance Ceramics & Refractories offer fully assembled heat exchangers?

No. Saint-Gobain Performance Ceramics & Refractories sells its products to heat exchanger OEMs for construction and assembly.

How well do silicon carbide tubes perform against fouling liquids?

Silicon carbide tubes are known to offer good resistance to fouling.

What is the difference between Hexoloy® SE and Hexoloy® SA SiC?

Both are pressure-less sintered Silicon Carbide materials.  Whereas SA grade is iso-pressed or dry-pressed, SE grade is extruded.