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    Specialty Ceramics

    Saint Gobain Specialty Ceramics' products allow customers to solve tough problems in thermal and chemical processing, industrial metrology, temperature sensing, brazing, mechanical seals, semi-conductor processing, sandblasting, and renewable energy generation applications. Specialty Ceramics' portfolio consists of more than a dozen products, sold as well-known brands: Hexoloy® materials, Norbide® nozzles, Noralide® materials, Silit® materials, Advancer® refractory parts, Alundum® materials, Magnorite® materials, Durafrax® materials and Lithafrax™ powders.
     
    At Saint Gobain, we use competence in design and precision manufacturing to deliver engineered solutions to customers in global automotive, chemical, aerospace, non-ferrous metals, industrial pumps and sealing industries, as well as OEM equipment makers and machine shops.
     
    Key Datasheets
    Specialty Ceramics Applications
    Discover our Solutions for Specialty Ceramics applications
    Specialty Ceramics Application, Thermocouple protection | Saint-Gobain

    Thermocouple Protection

    Temperature sensors provide essential data for control of industrial manufacturing processes. Sensors are often exposed to harsh environments and therefore must be protected to enable reliable and long-term operation. Hexoloy® SiC tubes provide unmatched protection against corrosion, abrasion and erosion from hot fluids and particulates without compromising sensor accuracy. High thermal conductivity of Hexoloy SiC tubes allow fast response of the sensors. It is ciritical to electrically insulate the thermocouple wires inside the thermocouple. Alundum (fused Alumina) and Magnorite (fused MgO) 'Crushable Insulators' provide insulation in Mineral Insulated Metal Sheath (MIMS) thermocouples and cables. 
     

    Thermocouple Protection

     
    Specialty Ceramics Products for Temperature Sensors
      OD ID Length Application & Advantages
    Closed One End Hexoloy SE SiC Protection Tubes

    9.5 - 25.4 mm
    (3/8" - 1-1/2“)

    6.35 - 25.4 mm
    (1/4" - 1")
    152 - 1 372 mm
    (6" - 54")

    Advantage: Thin wall, fast response, superior thermal shock resistance, works up to 1650ºC in oxidizing atmosphere

    Application: Thermocouples & Thermowells for Non-Ferrous Metals, Glass, Cement, Chemicals, Molten Salts 

    Fused Alumina Crushable Insulator

    0.56 - 12.7 mm 
    (0.022" - 0.5")

    0.18 - 7.24 mm
    (0.007" - 0.285")
    101.6 mm
    (4") max

    Advantage: High electrical insulation; not sensitive to humidity

    Application: MI thermocouples & cables

    Fused MgO Crushable Insulator

    0.56 - 12.7 mm 
    (0.022" - 0.5")

    0.18 - 7.24 mm
    (0.007" - 0.285")
    101.6 mm
    (4") max

    Advantage: High electrical insulation

    Application: MI thermocouples & cables 

    Fused MgO Insulating Grain
    Milled or Unmilled grains

    Advantage: High electrical insulation

    Application: MI thermocouples & cables 

     

    High Accuracy CMM & Motion Control

    Saint Gobain SiSiC and NSiC products allow high precision, accuracy and speed in industrial metrology equipment, such as CMM and Positioning Equipment, due to their high specific stiffness, lightweight, low thermal expansion and high thermal conductivity. The unique combination of several key properties of silicon carbide makes it a superior choice to other materials, including alumina ceramic, aluminum, steel and granite. Key applications include CMM bridges and Z axis; guide rails and air-bearing stages.
     
    Silicon carbide offers many advantages over traditional ceramic materials: 
    • Lightweight (~20%  less)
    • High specific stiffness (~25% higher)
    • Low thermal expansion (~50% less)
    • High thermal stability 

    Read Article Download Brochure

     

     

    Product Choices for Metrology Equipment
      Density
    (g/cc)
    Specific Stifness Thermal Conductivity 
    (W/mK) 
    Thermal Expansion 
    (10-6/K)
    Granite 2.8 - 2.9 21-32 3 5 - 7
    Alumina 3.95 96 20 8
    Steel
    7.88
    27 47 12
    Aluminum
    2.69
    26 204 22.5
    Advancer
    (NSiC)
    2,8
    86 20 4,4
    Silit
    (SiSiC)
    3,0 117 140 4,5
    Hexoloy
    (SSiC)
    3,10 132 125 4,0

     

    Specialty Ceramics Application, Shell & Tube Heat Exchanger | Saint-Gobain

    Shell & Tube Heat Exchanger

    For more than 30 years, Hexoloy® SE silicon carbide tubes have provided the most reliable and preferred choice for shell & tube heat exchangers used in fine chemicals and pharmaceutical industries. This success is based on virtually universal corrosion resistance, high thermal conductivity, extremely high hardness and mechanical strength of Hexoloy.
     
    Hexoloy SE tubes are available in 12.7 mm, 14 mm, and 19 mm outside diameter and lengths up to 5 m. Each tube is proof tested to 186 bars (2700 psi). Hexoloy SA SiC tube sheets are also available as per OEM design.
     

    See Datasheet

     

     

     Corrosion  Resistance of Different Materials Against Chemicals
    *Test Time: 125 to 300 hours of submersive testing, continuously stirred. 

    Test Environment* 

    Conc. Reagent
    (Wt%)

    Corrosive Weight Loss (mg/cm2 yr)
    Temp.
    (°C)
    Hexoloy® SA
    (No Free SiC)
    Reaction Bonded SiC
    (12% SiC)
    Tungster Carbide
    (6% Co)
    Aluminum Oxide
    (99%)
    98% H2SO4 100 1.8 55.0 >1000 >65.0
    50% NaOH 100 2.6 >1000 5.0 75.0
    53% HF 25 <0.2 7.9 8.0 20.0
    85% H3PO4 100 <0.2 0.5 >1000 7.0
    45% KOH 100 <0.2 >1000 3.0 60.0
    25% HCl 70 <0.2 0.9 85.0 72.0
    10% HF plus 57% HNO3 25 <0.2 >1000 >1000 16.0

     

     

    Specialty Ceramics Application, Chemical Processing | Saint-Gobain

    Chemical Processing

    Hexoloy® sintered silicon carbide has been successfully used for over 30 years in chemical processing applications, such as seal face and seat in mechanical seals used in pumps, tubes in shell & tube heat exchangers, thermowell protection tubes, valves for handling mining slurries, sparger tubes, Impellers for mixing, raschig rings, and chemical reactor vessels. Hexoloy material is highly corrosion resistant in contact with liquid and gaseous chemicals of a broad range of pH.
     

    Corrosion Resistance of Different Material Against Chemicals 
    *Test Time: 125  to 300 hours of submersive testing, continuously stirred. 

    Test Environment*
    Conc. Reagent
    Corrosive Weight  Loss (mg/cm2 yr)
    (Wt%)  Temp.
    (°C)
    Hexoloy® SA
    (No Free SiC)
    Reaction Bonded SiC
    (12% SiC)
    Tungsten Carbide
    (6% Co)
    Alminum Oxide
    (99%)
    98% H2SO4 100 1.8 55.0 >1000 65.0
    50% NaOH 100 2.6 >1000  5.0 75.0
    53% HF 25 <0.2  7.9 8.0 20.0
    85% H3PO4 100 <0.2 8.8 55.0 >1000
    70% HNO3 100 <0.2 0.5 >1000 7.0
    45% KOH 100 <0.2 >1000 3.0 60.0
    25% HCl 70 <0.2 0.9 85.0 72.0
    10%HF plus 57% HNO3 25 <0.2 >1000 >1000 16.0

     

    Specialty Ceramics Application, Semiconductor Wafer Processing | Saint-Gobain

    Semiconductor Wafer Processing

    Hexoloy® SA and SG components, such as vacuum chucks, chemical mechanical polishing (CMP) blocks and wafer carrier trays, are used in semiconductor wafer processing equipment. Hexoloy material’s thermal expansion matches to silicon, high elastic modulus, and chemical inertness ensures the economic benefits of maintenance and reuse, and high thermal conductivity for even, rapid heating of the silicon wafer.

    Hexoloy® SiC provides outstanding shape stability, wear & chemical resistance, and thermal properties for the production of semiconductor components.
     
    Advantages:  
    The thermal expansion of Hexoloy® – close match to silicon - coupled with high thermal conductivity allows even and rapid heating of the silicon wafer. Hexoloy® high elastic modulus, and chemical inertness ensures the economic benefits of maintenance and reuse. 
     
    Sintered Silicon Carbide Materials for Semi-Conductor Processing
    Material Density (g/cc) Flexural Strenght (MPa) Electrical Resistivity (ohm-cm) Thermal Conductivity (W/m.K) Elastic Modulus (GPa)

    Hexoloy SA
    (Sintered SiC)

    3.15 380 102-106 125 410
    Hexoloy SG
    (Sintered SiC with free Carbon)
    3.0 311 1 118 376

     

    Specialty Ceramics Application, Sandblasting | Saint-Gobain

    Sandblasting

    The extremely high hardness of sintered silicon carbide and boron carbide make these materials excellent choices for nozzles in high wear applications. Hexoloy® SA SiC and Norbide® B4C nozzles outlast WC and are successfully used in sandblasting and atomization applications.
     

    Key Datasheets

     

    Erosion Resistance of different materials:

     

    Specialty Ceramics Application, Thermal Processing | Saint-Gobain

    Thermal Processing

    Owing to its very high thermal conductivity, low thermal expansion, lightweight and high strength at high temperatures, Hexoloy® SA sintered silicon carbide products are an excellent choice for thermal processing applications. Examples include rapid thermal treatment of fibers, crystals; components of high temperature anaytical equipment (dilatometers and TGA).
     
    Key Properties of Sintered Silicon Carbide Material
      Density Coefficient of Thermal Expansion
    (x10-6/K)

    Flexural Strength 
    (Mpa)

    Thermal Conductivity
    (W/m K)
    Elastic modulus
    (Gpa)
    Hexoloy SA
    (Sintered SiC)
    3.15 4.0 380 125 410

     

    Specialty Ceramics Application, Labware | Saint-Gobain

    Labware Operations

    Our Labware is designed for laboratory operations involving ignition, weighing, melting, incineration, combustion, extraction or filtering. 
     
    Our refractory products are ideal for conventional laboratory operations. Made of Alundum® fused aluminum oxide grains produced in electric arc furnaces, our standard labware is manufactured to various degrees of quality according to designated applications. 
     
    Alundum® labware (made of the purest 99% aluminum oxide in its basic state) melts at 2054°C. With the addition of ceramic bonds and proper treatment, our labware has many unusual and useful properties.
     
    Our labware products include combustion boats with and without handles, dishes, thimbles, filters discs & cones, and crucibles & covers.

     

     
      Grade Approx. Particle Retention Size Apparent Porosity Composition Maximum Use Temperature Coeff. of Thermal Expansion (30-1500°C) Approx. Electrical Resistivity Effect on Atmospheres
    Alundum® AN-788 Fine 0.1 micron 35% 91% Al2O3 1450°C 8.6x10-6

    130.0 Megaohms at 530°C

    16.0 Megaohms at 730°C

    5.3 Megaohms at 890°C

    1.5 Megaohms at 1020°C

    Oxidizing: None

    Reducing: Reduction of bond constituents above 1400°C

    Effect on Acids: None except HF and concentrated H3PO4

    Effects of Alkalies: None except strong hot caustic solutions and fused alkalies

    Alundum® AN-889 Medium 5.0 microns 42% 85% Al2O3 1450°C 8.6x10-6
    Alundum® AN-485 Coarse 20.0 microns 47% 85% Al2O3 1450°C 8.6x10-6
    Zirnorite® YN-756 -- -- 25% 92.6% ZrO2 SiO2 1590°C 5.5x10-6 High

     

    Specialty Ceramics Application, Mechanical Seals | Saint-Gobain

    Mechanical Seals

    Saint Gobain pioneered the use of sintered SiC as a seal face in automotive water pumps in the early 1980s. Since then, Hexoloy® SiC has become the leading choice for mechanical seal face and seat material in automotive, chemical, oil & gas, and nuclear power industries. This success is driven by the exceptional hardness, strength, and chemical resistance of Hexoloy sintered SiC. Seal rings for nuclear reactor coolant pumps are also available in Noralide® Si3N4 material.

    Hexoloy SP SiC Datasheet

     

     

    Sintered Silicon Carbide Products for Seal Applications
    Area Unground Seal Unground Seal Blanks Ground Seals
    Hexoloy SA Up to 16” O.D. Up to 16” O.D. Up to 16” O.D.
    Hexoloy SP Up to 16” O.D. Up to 16” O.D.  

     

    Our Products
    Discover our specialty ceramics products
    Specialty Ceramic Products, Thermocouple Protection Tubes | Saint-Gobain

    Thermocouple Protection Tubes

     

    Thermocouple Protection Tubes

    Hexoloy® SE sintered silicon carbide thermocouple protection tubes are extruded and closed on one end.  Tubes are produced in standard lengths and diameters as shown in the table below.  Longer custom lengths and large diameters are available upon request.  The closed end is typically round, however, larger diameters, for example 1.5” tubes, have pointed tip. Hexoloy® SE tubes have thin walls, compared to other ceramic materials, enabling fast thermal response to the sensor.
    Learn More on Hexoloy Sensor Tubes 
     

     

    Nitride bonded Silicon Carbide (NB SiC) tubes are an economic choice to Thermocouple sensor OEMs. These tubes can be produced to a large range of OD, ID, with several options for mounting. NB SiC does not contaminate non-ferrous melts, like cast iron tubes. It also finds application in temperature measurement of heat treating furnaces.
    Advantage: Application: 
    • < 12% porosity (surface porosity < 1%)
    • Max service temperature: 1450°C
    • Economic choice among different types of SiC
    • Non-ferrous furnaces
    • Heat Treatment furnaces

     

    Silit®SK, Siliconized SiC, material can be used as Thermocouple protection tubes, closed on one end.  A wide range of diameters (20 m – 80 mm) can be produced with lengths up to 2 m.  Tubes with flanges and / or holes are available.

    Advantage:

    Application: 
    • High resistance to oxidation
    • High thermal shock resistance
    • Extreme high strength stability of shape up to maximum application temperature
    • Cooling Tubes
    • Thermocouple Protection tubes
    • Radiant Tubes in kilns / furnaces

     

    Thermocouple Protection

     

     

     

    Specialty Ceramic Products, Crushable Insulators | Saint-Gobain

    Crushable Insulators

     

    Crushable Insulators

    Crushable insulators are available in Alundum® 99.8% fused Al2O3 and Magnorite® 99.5% fused MgO grades.  Insulators are “threaded” on thermocouple conductor wires and inserted inside a seamless metal tubing.  The entire assembly is them swaged or drawn down to desired dimensions. During swaging the insulators crush readily into a powder, compacted around the thermocouple wires, providing electrical insulation resistance.  OD is available from 0.022” (0.5 mm) to 0.5” (12.7 mm). Hole diameter is available in the range 0.007” (0.18 mm) to 0.069” (1.75 mm).  The number of holes in an insulator ranges from 1 to 6.  Insulator lengths are available in 1” increments up to 4” maximum.  See attached brochure for detailed information on chemical purity, sizes, tolerances, and inspection.
     
    Advantage: 
    • High electrical insulation
    Applications: 
    • MIMS thermocouples & MI cables 
     

    Read Brochure

     

    Specialty Ceramic Products, Heat Exchanger tubes and tube-Sheets | Saint-Gobain

    Heat Exchanger Tubes & Tube-Sheet

     

    Heat Exchanger Tubes & Tube Sheets

    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.  Tubes go through a rigorous quality control and inspection process, including hydro-testing of every tube at 165 - 186 bars. Hexoloy® SE tubes have thin walls resulting in high heat transfer in a heat exchanger application.
     
    Hexoloy® SA silicon carbide tube sheets are available in a range of diameters and thickness.  Contact your Saint Gobain Application Engineer for details.

     

     

    Specialty Ceramic Products, Seal Tubes, Blank and Faces | Saint-Gobain

    Seal Tubes, Blanks & Faces

     

    Seal Tubes, Blanks & Faces

    Hexoloy® SA sintered silicon carbide seal tubes are available in a wide range of OD and ID combinations.  Typical length of the seal tube is 12”, through 6” tube is also available.  Seal tubes are unground and sold with “as-fired” tolerances.


    Low volume Hexoloy® SA sintered silicon carbide blanks are available in a range of OD and ID combinations. Typically the blanks are <1” thick, though thicker blanks are available.  High volume blanks (qty >500 pcs) are available as dry-pressed product up to 5.125" OD.  Blanks are typically unground and sold with “as-fired” tolerances.  


    Ground seal faces are available in Hexoloy® SA silicon carbide and Noralide® silicon nitride materials.  Both materials are fine-grained and produced to near theoretical density.  These attributes impart excellent wear resistance, a key requirement for seal face products. Both materials possess excellent resistance to corrosion from chemicals with a broad range of pH. Seal faces are produced to custom drawings with high quality surface finish.

    Applications:

    • Seal faces for mechanical seals used in industrial pumps.

    Advantages:

    • Exceptional hardness
    • Chemically inert to a broad range of chemicals

     

     

    Specialty Ceramic Products, Beams | Saint-Gobain

    Beams & Rods

     

    Beams & Rods

    Beams are available in at least three different materials, namely Silit® SKD - siliconized silicon carbide; N-Durance® nitride bonded silicon carbide, and Hexoloy® SE sintered silicon carbide.  Beams can be made in large selections of cross-sections, wall thickness and lengths (up to 4 m) using slip-casting or extrusion process. As-fired beams can be used "as-is" or finished to customer’s tolerances.  Applications include structural support in high temperature processes, and metrology equipment.
     
    See Hexoloy SE Beams Brochure See Silit SKD Brochure
     
    Hexoloy® SA and SE grades of Sintered Silicon Carbide are available as Rods for use in variety of thermal – mechanical applications.  Extruded Rods are available in diameters ranging from 0.125” to 0.53”.  Diameter tolerance is + - 2% or 0.01” minimum.  Straightness is 0.005 inch / inch maximum. 
     
    Advantages: 
    • Excellent thermal
    • Mechanical and chemical stability for use as small precision components
    Applications: ​​​​​​
    • High precision components in laboratory and industrial equipment
     

    See Hexoloy SE SiC Rod Bulletin

     

    Specialty Ceramic Products, Nozzle | Saint-Gobain

    Nozzle

     

    Nozzle

    Nozzles are available in two materials; Hexoloy® SA silicon carbide , and Norbide® B4C boron carbide.  Both materials have exceptional intrinsic hardness which enables superior wear and abrasion resistance from a wide range of abrasive solid and liquid media.  In addition, B4C is lighter weight compared to all other choices for nozzles.
     
    Typical uses include:
    • Blast nozzles
    • Monument nozzles
     

     

     

    Specialty Ceramic Products, Process Tubes | Saint-Gobain

    Process Tubes

     

    Process Tubes

    Hexoloy® SA sintered silicon carbide is an excellent material for “process” tubes in a wide range of thermo-chemical environments.  Tube diameter can range from 1” (25 mm) to 15” (381 mm), and lengths up to 48” (1.2 m).  Longer tubes (up to 16’) are available as assemblies using a proprietary bonding process.  
     
    Process tubes can also be made through extrusion (Hexoloy® SE) when long tubes (up to 5 m) are desired without joints. 
     

    Advantage: 

    • High oxidation resistance up to 1650C in air
    • Excellent corrosion resistance against a broad range of chemicals
    • High mechanical strength and erosion / abrasion resistance
    • Superior resistance to thermal cycling

    Applications:

    • Process tubes
    • Sparger tubes
    • Sensor tubes

     

    Tiles

     

    Tiles

    Hexoloy® SA Sintered Silicon Carbide Tiles are available in sizes ranging from 2”x2” to 7”x7” with thicknesses from 0.1” to 0.75”.  Hexagon shaped tiles are also readily available. One surface can be polished.

    Advantages:

    • Excellent thermal
    • Mechanical and chemical stability for use as small precision components

    Applications:

    • Industrial and research equipment.
    • Aerospace
    • Semi-conductor

    See Tiles Bulletin

    Specialty Ceramic Products, Custom Shapes | Saint-Gobain

    Custom Shapes

     

    Custom Shapes

    A wide range of custom shapes are available in Hexoloy® silicon carbide SA and SE grades.  Examples include impellers, crucibles, telescope mirrors and supporting structures, sparger tubes, raschig rings (packing for distillation columns), furnace belts and so on.  This capability comes from nearly 40 years of experience in precisely controlled raw materials, forming, shaping green parts with CNC equipment, sintering and finishing to tight tolerances.

     

     

    Specialty Ceramic Products, Lithafrax | Saint-Gobain

    Lithium Aluminum Silicate Based Powder

     

    Lithium Aluminum Silicate Based Powder

    Lithafrax® lithium aluminum silicate based powder was developed for use as a low thermal expansion inorganic filler in a wide range of materials.  Examples include resins, plastics, urethanes, sealing glass, coatings, glaze, and metal paste. The key advantage from Lithafrax powder is in controlling thermal expansion of the final product.  Lithafrax® powders have been successfully used in aerospace, military, automotive, electronics, and building & habitat markets.
     

    Advantages:  ​​​​​​

    • Near Zero Thermal Expansion Coefficient

    Applications: 

    • Aerospace
    • Military
    • Automotive
    • Electronics
    • Building & habitat markets.
     

    See Datasheet

     

    Industries We Serve
    Solutions customized based on your need
    Construction

    Construction

    Norbide® B4C nozzles are used in monument construction, water jet cutters, and sandblasting.

     

    Specialty Ceramics Industry, Nuclear | Saint-Gobain
    Nuclear
    Specialty Ceramics Solution, Nuclear | Saint-Gobain

    Nuclear

    Reactor coolant pumps (RCP) for Nuclear Power Plants use highly-engineered seals. These seal faces can be made of Hexoloy® SA, SG and Noralide® Si3N4.

     

    Specialty Ceramics Industry, Automotive | Saint-Gobain
    Automotive
    Specialty Ceramics Solution, Automotive | Saint-Gobain

    Automotive

    Our products enable long lasting solutions to key automotive parts, such as water pump mechanical seals and heat exchangers.

     

    Specialty Ceramics Industry, Semi-Conductor | Saint-Gobain
    Semi-Conductor
    Specialty Ceramics Solution, Semi-Conductor | Saint-Gobain

    Semi-Conductor

    Semi-conductor wafer grinding and polishing requires use of substrates that are extremely hard, flat and chemically resistant. Hexoloy® SA and SG plates provide superior service in this application. 

     

    Specialty Ceramics Industry, Aerospace | Saint-Gobain
    Aerospace
    Specialty Ceramics Solution, Aerospace | Saint-Gobain

    Aerospace

    Our crushable insulators and silicon carbide products enable processing of MIMS thermocouples and components for modern lightweight engines.

     

     

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