What is mosi2 heating element

Mosi heating element is a kind of resistance heating element basically made of pure molybdenum Disilicide, it is a High-Density Material. It forms a dense quartz ceramic protective layer on the surface at high temperature to protect itself from oxidation, and has strong oxidation resistance.

The protective layer of Mosi2 has a strong regenerative ability under oxidative environment and high temperature conditions,Despite molydisilicide heating elementsrobust appearance they are a fragile, glasslike material with low mechanical shock resistance.

Heating temperature of MoSi2 heating element

In oxidizing atmosphere, Mosi2 Heating Element’s Max temperature can reach 1900 ℃ (3452℉) and its applicable temperature is 500℃-1850℃ (932℉ – 3362 ℉).

Basically, The maximum element temperature is always 100 °C (212℉) higher than the maximum rated furnace temperature, so for example we use 1800 °C (3272℉) elements in our 1700 °C (3092℉) furnaces.

MoSi2 heating elements are available in the following common shapes

Copper Braided Wire Accessory Mosi2 Resistance Is A Heating Element With Copper Connecting Wire As Electric Conductor.

Copper braided wire accessory mosi2 heater

What is Copper braided wire accessory mosi2 heater ? Copper braided wire accessory mosi2 heater, also called Copper wire integrated molybdenum disilicide heating element or copper connecting wire mosi2 resistance is a kind of copper braided strap and molybdenum disilicide heating element closely combined by a special technology to form an integrated structure.  So that the the connection terminal can withstand higher temperatures, suitable for high […]
The Packaging Of 1900 Molybdenum Disilicide (Mosi2) Heating Element

1900 Molybdenum Disilicide (MoSi2) Heating Element

Product standard specification and reference data Diameter(mm) φd(hot zone)/ φc(cold zone) shape length(mm) Le(hotzone)/ Lu(cold zone) a(mm) g(mm) f(mm) h(mm) n(mm) Standard Minimum Standard Minimum 3/6 U, L, W or customized customized 25 12 15 30 10 40 35 4/9 U, L, W or customized customized 25 15 20 30 10 50 45 6/12 U, […]
U Shape Mosi2 Heating Element

Super pure mosi2 heater

What is Super Pure Mosi2 Heater? Super Pure Mosi2 Heater is a type of heating elements made of Molybdenum Disilicide (Mosi2) material. It is a super high-temperature material that can withstand temperatures up to 1800 ℃(3272℉). This makes it perfect for high-temperature applications that require precision heating and consistent performance. Features and Benefits Our Super […]
W Shape Mosi2 Heating Elements

W shape mosi2 heating element

Why W shape mosi2 heating element? This type of mosi2 heating element looks like the letter “W”, so it is called “W shape mosi2 heating element”. Application high temperature electric furnace heating Classification Furnace heater Main Material Molybdenum disilicide MoSi2 Supply Ability 5000 Piece/Pieces per Week for W shape MoSi2 heating element Experience in Making […]
U Shape Mosi2 Heating Elements

U shape mosi2 heating element

What is u shape mosi2 heating element? The u shape mosi2 heating element looks like the letter “U” in English, it is durable and reliable at high temperatures. The U shaped mosi2 heating elements are most frequently used suspended with the bottom of the “U” down. The element consists of two cold ends (Lu) and […]
Straight Shape Mosi2 Heating Element

Straight shape mosi2 heating element

What is straight shape mosi2 heating element? Straight shape mosi2 heating elements and DB type sic heating elements are similar in appearance, both are linear in shape, but they are made of different materials. The straight shape mosi2 heating element is made of molybdenum disilicide and the DB type sic heating element is made of […]

Straight Mosi2 Heating Element

Straight Mosi2 heating elements are the most common shape and are used in various applications, including ceramics, metallurgy, and heat treatment. They are available in different diameters and lengths, depending on the requirements of the application.

U-Shaped Mosi2 Heating Element

U-shaped Mosi2 heating elements are designed for applications where a uniform heat distribution is required. The U shape allows for a larger heating surface area, which helps to distribute heat evenly throughout the furnace. The element consists of two cold ends (Lu) and a U-shaped hot section (Le).The cold ends are twice the diameter of the hot section and are attached by a weld.

U-Shaped is commonly used in the production of glass, ceramics, and metallurgy.

W-Shaped Mosi2 Heating Element

W-shaped Mosi2 heating elements are designed for high-temperature applications where a high degree of thermal shock resistance is required. The unique W shape allows the element to expand and contract more freely, which reduces the likelihood of cracking or breaking due to thermal stress.

W-Shaped is commonly used in the semiconductor industry and other high-temperature applications.

L-Shaped Mosi2 Heating Element

L-shaped Mosi2 heating elements are used in applications where space is limited or where a specific heating pattern is required. The L shape allows the element to be positioned in a way that maximizes its heating efficiency while minimizing its footprint.

L-shaped is commonly used in the production of ceramics, glass, and metallurgy.

Double Spiral Mosi2 Heating Element

Double spiral Mosi2 heating elements are designed for applications where a higher degree of heating efficiency is required. The double spiral design allows for a larger heating surface area, which increases the element’s overall heating capacity.

Double Spiral is commonly used in the production of semiconductors, electronic components, and other high-temperature applications.

Note:For more details, please see this article:https://sicelement.com/different-shapes-of-mosi2-heating-elements/

Structure of the Mosi2 heating element

The MoSi2 heating element has a long, thin, tubular shape with two terminals. The body of the heating element is composed of a dense ceramic material, which is made of high-purity MoSi2 sintered at high temperatures and has a high melting point and good oxidation resistance.

The molybdenum core is coated with quartz glass. The elements become nearly liquid as they approach the maximum temperature, and the glass surface reacts with the oxygen in the air atmosphere to form a renewed coating of protective glass on the element surface.

The two terminals of the heating element are made of metallic materials such as nickel-chromium alloy (NiCr) or tungsten-rhenium alloy (Re). These materials have good electrical conductivity and thermal stability and can efficiently transfer electrical energy into thermal energy.

How do Mosi2 Heating Elements Work?

Mosi2 heating elements work based on the principle of electrical resistance heating. When an electric current is passed through the Mosi2 heating element, it produces heat due to the resistance of the material.

The heat generated by the Mosi2 heating element is proportional to the amount of electric current passed through it, which allows for precise temperature control.

Advantages and Disadvantages of Mosi2 Heating Elements


Mosi2 heating elements have good stability and mechanical strength at high temperatures, and can maintain long-term stable performance at high temperatures. In addition, Mosi2 heating elements also have excellent oxidation resistance and corrosion resistance, so they have a long service life when used at high temperatures.


Mosi2 heating elements are relatively expensive and have high costs, and they are also susceptible to mechanical shock or thermal shock, which can lead to problems such as breakage.


Mosi2 Heating Element Plate Holders

Mosi2 heating element two shank holders

Two-shank holders are used only by mosi2 heating element. The Two-shank holders includes stainless steel clips and ceramic blocks.It is held in place by two plates and a piece of insulation located in the center of the holder. The insulation board is made of high-temperature ceramic fiber which can withstand high temperature. Two shank holders […]
Mosi2 Heating Element Circle Type Clamps

Mosi2 heating element single shank holders

We offers a wide range of accessories for connection of molybdenum disilicide (MoSi2) electric Heating element . This includes single- and two-shank element holders, contact straps, stain steel clamp and ceramic plate bricks. We supply the matching fastening systems depending on element size. Mosi2 heating element single-shank holders can be used for all kinds of […]
Mosi2 Heating Element Plate Holders

Mosi2 heating element plate holders

Mosi2 heating element plate holders are used to secure and support the terminals of MoSi2 Heating Elements in applications where the elements are installed from the inside of a furnace chamber. The insulating tab fills the opening from the top of the ceramic plates to the hot face of the furnace chamber. The tab seals and reduces the […]
Mosi2 Heating Element Accessories

Mosi2 heating element combination straps

Combination straps are used to connect element to bind post or element to element. Mosi2 heating element combination straps is made from high purity aluminium which provides high electrical conductivity, flexibility and resistance to oxidation at high temperatures. Specifications The mosi2 heating elements combination straps are offered in 75, 150, 200, 400 and 600 amperage […]
Mosi2 Heating Element Holders

Mosi2 heating element holders

The ceramic holder consists of two ceramic blocks held in place by two pieces of stainless steel angle, hex nuts, and hex head cap screws. These ceramic holders offer higher temperature capabilities than metallic holders. Element sizes Identification Ceramic holders are described by the Moly-D element size. As an example, the part description for a […]
Ceramic Holders For Mosi2 Heater

Ceramic holders for mosi2 heaters

Connection Straps Connection straps are used to connect element to bind post or element to element. It is made from high purity aluminium which provides high electrical conductivity, flexibility and resistance to oxidation at high temperatures. Element Holders Element holders are used only by MOSi2 Heating Element. It is held in place by two plates […]

Comparison of Mosi2 Heating Elements with Other Types of Heating Elements

Mosi2 Heating Elements VS Resistance Wire Heating Elements:

Mosi2 heating elements have a higher operating temperature, longer service life and better stability than resistance wire heating elements. The resistance wire heating element is relatively cheap, but it is easy to be damaged due to overload, and it is prone to problems such as oxidation and fracture at high temperature.

Mosi2 Heating Elements VS SiC Heating Elements:

Both Mosi2 heating elements and silicon carbide heating elements have stability and mechanical strength at high temperatures, but Mosi2 heating elements have better oxidation and corrosion resistance than silicon carbide heating elements, so they last longer at high temperatures. However, the price of Mosi2 heating elements is relatively high, while the cost of SiC heating elements is relatively low.

Applications of Mosi2 Heating Elements

Mosi2 heating element can be widely used in such applications as sintering and heat treatment of ceramics, magnet, glass, metallurgy, refractory etc.Especially, Mosi2 heater is the requisite heating element in heat sintering process of high-performance ceramics, high rank synthetic crystalloid, sophisticated structure cermets, glass fiber, optical fiber as well as high rank alloy steel, and it is the best environment-protecting product in the heating area in the 21st Century.

  1. Suitable for the intermittent high temperature furnace with frequent heating-cooling.
  2. Suitable for dental furnace with no discoloration, Rapid thermal cycling applications.
  3. Suitable for Sintered products with strict thermal field of the environment.

Below we mainly explain the application of heating elements in industry and the application in laboratory and research

Industrial Applications

Mosi2 heating elements are widely used in various industries such as metallurgy, glass, ceramic, and semiconductor manufacturing due to their high-temperature stability, long service life, and excellent oxidation resistance. They are used in high-temperature furnaces, kilns, and ovens for processes such as sintering, heat treatment, annealing, and melting.

Laboratory and Research Applications

Mosi2 heating elements are also used in laboratory and research settings for high-temperature experiments and testing. They are used in high-temperature furnaces and ovens for processes such as crystal growth, material synthesis, and thermal analysis. Mosi2 heating elements are preferred for their stability and uniformity of heating, which is crucial in many research applications.

Grades of MoSi2 heating elements

1700 Grade Mosi2 heating element

Maximum Element Temperature: 1700 °C (3092℉)

General Applications

Most types of industrial furnaces for heat treating, forging, sintering, glass melting and refining, and for use in radiant tubes.

1800 Grade Mosi2 heating element

Maximum Element Temperature: 1800 °C (3272℉)

General Applications

Laboratory furnaces, testing equipment, and high temperature sintering production furnaces.

1700 Grade and 1800 Grade Mosi2 heating element have some common advantages:

  1. Product has the capabilities to resistance to oxidation and automatically repair, suitable for continued using in any kinds of oxidizing atmospheres.
  2. Product is shaped in hot-working process, which keeps the base material in good tenacity and plasticity at high temperature. The geometrical figure, standard and dimension is canonical, may produce any special shape and any dimension to meet the customer requirement.
  3. Because of the special technology, welding spot is fast and shock resistance, which dramatically reduced the damaged probability of welding spot by electric current, as well as transit and installation.
  4. Adopt special technology, heaters come with compact protective layer, excellent performance in no-oxidizing atmosphere electric furnaces.
  5. New and old elements can be operated in the same control group.
  6. The high power makes possible rapid increases in furnace temperature.

1850 Grade Mosi2 heating element

The unique properties

  1. High temperature MoSi2 heating element for various electric furnaces.
  2. Maximum Element Temperature: 1850°C (3362 °F), safety running for operating temp: 1750 ℃ (3182℉)
  3. Long service life and ease of replacement contribute to high furnace utilization and low maintenance costs.
  4. New and old elements can be use together and in series.
  5. Can dissipate high power loading.
  6. Can be use continuously or intermittently.
  7. Provide rapid furnace temperature ramping

General Applications

Laboratory furnaces, testing equipment, and high temperature sintering production furnaces up to 1800 °C (3272 °F)furnace temperature.

1900 Grade Mosi2 heating element

  1. Max. working temperature 1850 ℃ (3362 °F), safety running for operating temp. 1750 ℃(3182 °F)
  2. Elements may be used at surface temperature up to 1900 ℃ (3452 °F), at control furnace temperatures up to 1750℃ (3182 °F) in oxidizing atmospheres. Lower temperatures are recommended in reducing atmospheres.
  3. High density of SUNSHINE product increases its electrical conductivity. The characters of faster warming and power consumption low, which reduce production cost.
  4. Good appearance quality and tenacity, high mechanical strength.
  5. General Applications – High temperature MoSi2 heating element for various electric furnaces.


Physical Characteristics

  • Volume Density: 5g/cm³
  • Bending Strength: 15-25kg/cm³
  • Vickers Hardness(HV): 570kg/mm²
  • Porosity: 4%
  • Water absorption: 2%
  • Heating Elongation Rate: 4%

Chemistry Characteristics

Oxygen-resistance under high temperature:in oxidizing atmosphere,a layer of compact quartz (SiO2)protective film is formed on the surface of element owing to the high-temperature combustion, which prevent Mosi2 from continuously oxidizing.

When the element temperature is higher than 1700 °C (3092 °F), the sio2 protective film will be fused because its fusing point is 1710 ℃ (3110℉) and the sio2 is fused into molten dropa owing to the action of its surface extension,which cause losing its protective ability .In the oxidizing atmosphere, when the element is continuously used, the protective film forms again.

The MoSi2 heating element must not be used in the temperature between 400 °C (752 °F)and 700 °C (1292 °F) for a long time, otherwise the element will be cremated under the strong oxidizing function in the low temperature.

Surface Load

According to the structure, the temperature and atmosphere in the correct choice of components surface load is the key element to the highest life, based on the thermal radiation components uncrossed circumstance temperature, temperature and surface load components, the shaded part for common surface load — the temperature range.

Surface Load
Surface Load
Furnace Temp(°C)14001500160016501700
Surface load of hot zone(w/cm²)<18<15<12<10<8
MoSi2 heating element Surface load

Maximum amperes

The Moly-D elements are low-voltage high-current elements. Below is the maximum recommended current for each standard hot zone diameter. The hot zones can take more power but the cold ends tend to over heat and cause strap and clamp failure.

Hot Zone Diameter in mm346912
Current Amperes75115200365560
Maximum Recommended Amperes

Resistance characteristics

The resistivity of element rapidly rises along with the temperature rises , under normal operating condition,generally the element resistance doesn’t change with the application time changing.So the old and new elements can be used together.

Resistance Characteristics
Resistance Characteristics

The mosi2 heating element is a resistant type heater that converts electrical energy to heat energy according to Joules Law W=I2R. W = Power in watts, I = Current in amperes, R = Resistance in ohms.

Molybdenum disilicide increases in resistance by a actor of approximately 10 between 20 °C (68℉) and 1800 °C (3272 °F). Therefore the hot zone temperature must be known before the resistance of the hot zone can be determined.

The mosi2 element is a high temperature element that performs well and gives long service life at its rated temperature of 1710 °C (3110 °F) or 1800 °C (3272 °F). Therefore, we recommend designing to element temperatures of 1675 ºC (3047℉) for the grade 1700 Grade and 1775 °C (3227℉) for the grade 1800.

The resistance values for 1mm of length for standard element diameters at 1675 °C (3047 °F) and 1775 °C (3227 °F) are shown on the following Table.

Resistance in ohms per mm of length 1675℃ and 1775℃
Hot Resistance in ohms per mm of length 1675℃ and 1775℃
Section Diameter 1675℃ (3047 °F) 1775℃ (3227 °F)
3 0.00493 0.000523
4 0.000277 0.000294
6 0.000123 0.000131
9 0.000054 0.000058
12 0.00003 0.000032

Indications in different atmospheres.

Ar Ne Argon, Helium1600170017001700
Dry Hydrogen (dew point)-80℃ (176℉)1150115011501150
Wet Hydrogen (dew point)-20℃ (68℉)1450145014501450
Exogas(e.g. 10% CO2, 50% CO, 15%H2)1600170017001700
Exogas(e.g. 40% CO2, 20% CO)1400145014501450
Cracked and partially burnt ammonia(8%H2)1400145014501450

Advice for first time users

When the elements are new (first used) they must be brought to an element temperature of 1200 °C (2192°F) or higher quickly in air. If operated at a surface temperature in the 500 °C (932 °F) to 700 °C (1292 °F) range for any length of time before the glaze is formed the elements will be destroyed.

After the glaze is formed, the element may be operated at low temperatures as long as the glaze is intact.

Notice to Furnace Operation

To avoid high current surges which may cause damage to MoSi2 heating elements, the recommend starting procedure as following:

Small Furnace(Power 100KW) Big Furnace(Power100KW-500KW)
Furnace Temperature °C Voltage Furnace Temperature °C Voltage
20-150 1/3 20-300 1/3
150-500 2/3 300-700 2/3
500-Working Temperature Full 700-working Temperature Full
Note: Shifting gear must be done quickly, otherwise high current surges may cause damage.

Read more:

How to calculate the power on a U-shapes mosi2 heating element ?

Can MoSi2 Replace SiC Heating Elements?

Mosi2 Heating Elements Installation and Maintenance

Buying Guide for Mosi2 Heating Elements

a. CHOOSE THE RIGHT SIZE AND SHAPE: Choosing the right size and shape is very important when selecting a Mosi2 heating element. Factors to consider include the size of the heating chamber or furnace, the required temperature of the furnace, and even heat distribution.

b. Pay attention to the rated power and voltage of the heating element: The rated power and voltage of the Mosi2 heating element should also match the furnace to ensure compatibility with the power supply and control system. Overloading a heating element can cause it to fail prematurely, while undersizing a heating element can lead to insufficient heating.

c. Choosing the right heating controller: Choosing the right controller is also very important for the efficient operation of the Mosi2 heating elements. Choosing the correct controller depends on the temperature range required, the rate of heating, and the level of precision and control required.

Sunshine is a supplier and manufacturer with many years of experience in producing heating elements, long life and efficient heating are our specialties.

We sell Mosi2 components at reasonable prices, and provide perfect after-sales service and technical guidance.

For bulkbuy, please contact us, you will get a satisfactory price.