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Item # SG-70, SG-70 (2300ºF Refractory Matrix Composite Board)



SG-70 is a non-asbestos ceramic refractory reinforced with continuous fibers to increase the toughness, structural reliability and overall performance of the ceramic composite. Supplied in sheets, boards, cylinders and other geometric shapes, SG-70 exhibits non-brittle behavior and can withstand extreme thermal shock and cycling within its specified temperature range. Chemically inert, unaffected by moisture and non-wetting to non-ferrous metals, SG-70 is machinable with standard tools. Thermally and electrically insulating, SG-70 is an excellent material choice for a variety of structural applications. Compared to SG-50, the SG-70 material has a more homogeneous fiber reinforcement structure which allows for intricate machining (i.e. counter-boring). It also has a higher service and ultimate use temperature than the SG-50 material.

Other sheet/cylinder sizes and thickness and geometric shapes are available upon request - please inquire.





Specifications  · Standard Sizes  · Competitive Products  · Advantages  · Applications

Specifications

Typical Composition

Al2O3 - 70%
Other Metal Oxides - 10%

SiO2 - 20%

Density

2 g/cc
130
lb/ft³

Porosity

30 %

Color

White

Flexural Strength

58 MPa
8400
psi

Compressive Strength

85 MPa
12325
psi

Structural Use Temperature

816 ºC
1500
ºF

Maximum Use Temperature

1260 ºC
2300
ºF

Thermal Conductivity at 205ºC (400ºF)

4.2 BTU-in/hr-ft²-ºF
0.6
W/m-ºK

Thermal Conductivity at 425ºC (800ºF)

4.41 BTU-in/hr-ft²-ºF
0.63
W/m-ºK

Thermal Conductivity at 625ºC (1200ºF)

4.69 BTU-in/hr-ft²-ºF
0.67
W/m-ºK

Thermal Conductivity at 1000ºC (1832ºF)

4.9 BTU-in/hr-ft²-ºF
0.7
W/m-ºK

Linear Shrinkage, 24 hrs. Isothermal Soak at 870ºC (1500ºF)

1/2 %

Linear Shrinkage, 24 hrs. Isothermal Soak at 1260ºC (2300ºF)

1 %

Dielectric Constant

5.5

Dielectric Strength

91 V/mil

Electrical Resistivity

52 x 1010 ohm-cm


Standard Sizes

Sheet Thickness

1/32 in
1/16
in
1/8
in
3/16
in
1/4
in
3/8
in
1/2
in
3/4
in
1
in
2
in
3
in

Sheet Area

4 x 4 ft

Inner Diameter

2 to 36 in

Thickness

1/8 to 1/2 in

Length

up to 84 in


Competitive Products
  • RS100/101, 200/201
  • Metal / Steel
  • Plastics
  • Dense Asbestos
  • Machinable Ceramic
  • Cordierite
  • Vacuum-formed Shapes
  • Castable Ceramics



Advantages
  • Asbestos-Free
  • Use Temperatures to 1260ºC (2300ºF)
  • Chemical Inertness
  • Non-Wetting to Non-Ferrous Metal
  • Unaffected by Moisture or Water
  • Non-Brittle
  • Abrasion Resistance
  • Thermal Shock Resistance
  • Good Reflectivity
  • Low to Negligible Shrinkage
  • Excellent Dimensional Stability
  • Machinable with Standard Tools
  • High Dielectric Strength / Electrical Resistivity
  • Little or No Outgassing
  • Good Bending Strength
  • Good Compressive Strength




Applications
Markets Specific Applications
Specialty Furnace Components Bottom Supports for Quartz Furnaces
Hard Face Furnace Lining
Low Temperature Kiln Furniture
Specialty High Temperature & Electrical Insulation Corona Plastic Treating in Printing Process
Internal Lining for Glass Tempering Furnaces
Electrical Resistor Grids in Locomotive Dynamic Systems
Specialty Metal Working Components Insulator Between Press Platens in Plastic Forming of Titanium
Compression Plate Insulation Electric Insulator for Induction Pressing Diamond Saw Segment
Platen or Mold Insulation for High Temperature Presses
Non-Ferrous Metal Handling Equipment Aluminum Filter, Homogenizer and Purifier
Crustbreaker Plunger hace Aluminum Holding Furnace
Skimmer Dams & Baffles
Specialty Structural Insulation Components
Induction Furnace Components Channel Melter Components (Brass Foundry)
Coil Liners, Channel Melters, Box Plates
Coreless Induction Furnace Components
Cover, Top, Rase, Side, Front and Bark Plates, Coil Posts
Coil Support, Upper Fitting, Spacer, Riser Blocks, Splash and Coil
Shields, Crucible Hold Downs, Coil Support Spacer Rings
Utility/Energy Tubesheets, Candle Filters

This information, which is subject to change, is offered solely for your consideration and is not a warranty or representation for which we assume legal responsibility.



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·  Refractory Composites


 DOWNLOADS 

Data Sheet for SG-70 (2300°F Refractory Matrix Composite Board)
(PDF, 270KB)


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Foundry Service & Supplies, Inc. | Heat And Corrosion Resistant Industrial Insulation & Construction Materials