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Silicon Carbide Gasket, SiC Gasket

Silicon Carbide Gasket, SiC Gasket

Silicon carbide gaskets, also known as SiC gaskets, are sealing products made from high-quality silicon carbide materials. SiC gaskets are designed to provide superior performance in high-temperature and high-pressure applications where conventional gaskets may fail.

Silicon carbide is a hard and durable ceramic material that offers excellent thermal and chemical resistance properties. It has a high melting point, low thermal expansion coefficient, and high thermal conductivity, making it ideal for use in extreme environments. SiC gaskets are resistant to acids, alkalis, and most organic chemicals, making them suitable for use in chemical processing, petrochemical, and semiconductor industries.

SiC gaskets are manufactured using a variety of processes, including molding, machining, and cutting. They come in different shapes and sizes, such as circular, rectangular, and custom-made shapes to fit specific sealing applications. SiC gaskets are commonly used in high-temperature applications such as furnaces, kilns, boilers, and gas turbines. They are also used in vacuum systems, aerospace applications, and nuclear reactors due to their excellent resistance to radiation.

Overall, silicon carbide gaskets are highly reliable and provide excellent sealing performance in demanding applications. They are widely preferred over other conventional gasket materials due to their superior properties and long service life.


Silicon Carbide Ceramics Properties

Compound Formula SiC
Molecular Weight 40.1
Appearance Black
Melting Point 2,730° C (4,946° F) (decomposes)
Density 3.0 to 3.2 g/cm3
Electrical Resistivity 1 to 4 10x Ω-m
Poisson's Ratio 0.15 to 0.21
Specific Heat 670 to 1180 J/kg-K

Silicon Carbide Ceramics Specification

CAS#: 409-21-2, Not Hazardous
Powder, F.W. 40.10, m.p. 2700 °C, Spec. Gravity 3.217 gm/cm3
Item No. Description Purity Lot Size
CB14-85 Silicon Carbide Powder
Particle Size:18, 30, 40 or 200 mesh
> 85 %
F.C. < 2.5%, Fe2O3 < 2%, Al2O3 < 1.2%
CB14-90 Silicon Carbide Powder
Particle Size:18, 30, 40 or 200 mesh
> 90 %
F.C. < 1.5%, Fe2O3 < 1.2%
CB14-98 Silicon Carbide Powder
Particle Size:18, 30, 40 or 200 mesh
> 98 %
F.C. < 0.6%, Fe2O3 < 0.7%

Silicon Carbide Ceramics Applications

Until the invention of boron carbide in 1929, silicon carbide was the hardest synthetic material known. It has a Mohs hardness rating of 9, approaching that of a diamond. In addition, SiC crystal has fracture characteristics that make them extremely useful in grinding wheels and in abrasive paper and cloth products.

Its high thermal conductivity, together with its high-temperature strength, low thermal expansion, and resistance to chemical reaction and thermal shock, makes silicon carbide valuable in the manufacture of high-temperature bricks and other refractories.

SiC ceramic is also classed as a semiconductor, having an electrical conductivity between that of metals and insulating materials. This property, in combination with its thermal properties, makes SiC a promising substitute for traditional semiconductors such as silicon in high-temperature applications.

Silicon Carbide Gasket Specifications




Sintered Silicon Carbide (S-SiC)

SMB1  Basic pure SiC

Purity of SiC > 98%

Hv: 26 GPa

SMG1  Graphite impregnated

15%~20% content of Graphite

SMP1  Porous

Better friction resistance

Reaction Bonded Silicon Carbide (RB-SiC)

SMB2  Basic SiC

Purity of SiC > 88%

SMG2  Graphite impregnated

20%~30% content of Graphite


Silicon Carbide Gasket Applications

-Silicon carbide can be applied in areas such as semiconductor and coating.
-Silicon carbide is an ideal material for pump gaskets.


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