SiC Heating Elements
DB type silicon carbide heating elements for industrial furnace replacement, with DB vs ED identification, dimensions, furnace fit, resistance and RFQ guidance.
The silicon carbide heating element is a kind of non-metal high temperature electric heating element. It is made of selected super quality green silicon carbide as main material.which is made into blank,silicided under high temperature and re-crystallized. Compared with metal electric heating element,this kind of element is characterized by high-applied temperature,anti-oxidization,easy installation and maintenance. Therefore, it is widely used in various high temperature electric furnaces and other electric heating devices, such as in the industries of magnet, ceramice, powder metallurgy, glass metallurgy and machinery,etc.
1. High working temperature: 1400C.
2. Long time last.
3. Varous type available. Rod, U, W, Single Spiral, Double Spiral
1. High working temperature: 1500C (Surface Temperature)
2. Various shapes: Rod, U, W, Single Spiral, Doule Spiral shapes are availible.
3. Large size range: Diameter 14-54mm, Length 200-4500mm.
4. Fast Delivery: Normal quantity can be ready in 10 days.
5. Very competitive prices.
1. SiC Heating rod is heated in the air after the formation of a silicon oxide film compact surface,Into a protective film to protect the antioxidant, play a role in prolonging life. In recent years, our company developed a variety of silicon carbide coating to prevent cracking, for a variety of gas furnace.
2. Continuous use of silicon carbide, hoping to slow increasing resistance to maintain long life.
3. Globar as far as possible in parallel. If the silicon carbide with different resistance and series resistance of silicon carbide rod load, resulting in a rapid increase in a silicon carbide rod resistance, shorter life expectancy.
4. After the silicon carbide rod with the temperature higher lifetime is shorter, so in the furnace temperature super 1400 DEG C, accelerate the oxidation rate, shorten life. Use note try not to let the silicon carbide surface temperature is too high.
DB type SiC elements use a dumbbell structure with larger cold ends. The listed DB data covers the following hot-zone, cold-end and load ranges.
| Parameter | Listed range or value | Buyer note |
|---|---|---|
| Hot zone diameter | 8-30mm | Use D1 when sending a drawing or replacement sample. |
| Cold end diameter | 14-45mm | Use D2 to confirm holder and terminal fit. |
| Hot zone length | 150-1000mm | Match furnace heating width and heat distribution. |
| Cold end length | 60-600mm | Match furnace wall thickness and connection clearance. |
| Overall length | 300-2000mm | Use the full end-to-end length for replacement inquiries. |
| Reference resistance at 1400℃ | About 1.0-4.6Ω | Resistance should be reviewed with voltage, current and furnace temperature. |
The DB load table gives maximum allowable load by furnace temperature from 1100℃ to 1400℃. As furnace temperature increases, allowable wattage decreases, so the operating point should be checked with voltage, current and surface load.
| Operating item | Technical value | Buyer note |
|---|---|---|
| Maximum element temperature | Up to 1600℃ in clean dry air | Atmosphere may reduce the practical service temperature. |
| Recommended surface loading | 3-8 W/cm² for furnace design | Lower surface loading is preferred when longer service life is required. |
| Resistance measurement | Measure at 1000℃ or above from voltage and current | Room-temperature resistance does not represent high-temperature resistance. |
| End of functional service life | Resistance reaches 3 times the original value | Keep voltage, current and resistance records for later replacement. |
| New element operation limit | Voltage not over 80% of test value; power not over 65% of test value | Use rated test values only for calibration review. |
The following installation and electrical rules are useful for furnace builders and replacement projects.
| Item | Recommendation | Why it matters |
|---|---|---|
| Element center to element center | Minimum 2 times element diameter; 2.5-3 times is recommended | Helps reduce local overheating and short-circuit risk. |
| Element center to furnace wall | At least 1.5 times element diameter | Leaves space for heat radiation and installation tolerance. |
| Element center to heated product | At least 2 times element diameter | Helps avoid direct obstruction and uneven radiation. |
| Preferred circuit connection | Parallel connection is preferred where possible | Small resistance changes tend to balance during use. |
| Series connection | Up to 4 elements when resistance is well matched; limit to 2 above 1400℃ | Reduces overload risk when resistance changes over time. |
| Resistance matching | Series: +/-5%; parallel: +/-10% | Useful when grouping elements for replacement and maintenance. |
| Voltage reserve | Usually 50%-100% above the voltage required by new elements | Allows the power supply to compensate for resistance aging. |
A DB type silicon carbide heating element is a straight dumbbell-shaped element with a smaller hot zone and larger cold ends. Buyers searching for a silicon carbide heating element for a furnace should first confirm that this shape matches the installed rod instead of selecting by furnace name or overall length alone.
| Replacement check | Evidence to collect | DB type decision |
|---|---|---|
| DB or ED shape | Measure the hot-zone diameter D1 and cold-end diameter D2, then attach a full-element photo or drawing. | DB has larger cold ends; an equal-diameter straight rod should be reviewed as ED type. |
| Furnace chamber fit | Record hot zone, cold ends, overall length, furnace wall thickness and terminal clearance. | The hot zone should remain inside the heated chamber while the cold ends pass through the furnace wall. |
| Electrical match | Provide resistance at the stated operating condition, voltage, current, power and series or parallel grouping. | A dimensionally similar DB element still needs an electrical match, especially when it joins aged elements. |
| Operating condition | Provide furnace type, working and peak temperature, atmosphere, heated material and duty cycle. | These conditions affect practical surface load and the replacement review. |
| Installation scope | Attach terminal photos and identify clamps, conductive connection tape, spares and quantity. | Use the heating element accessories page to include the complete terminal scope. |
For a broader furnace replacement workflow, use the silicon carbide heating element furnace replacement checklist. Send the confirmed dimensions, electrical records and installed photos through the RFQ form; mark any unavailable value as unknown instead of estimating it.
FAQ
A DB type element has a smaller hot-zone diameter and larger cold-end diameters, while an ED type straight element has an equal diameter. Measure D1 and D2, record hot zone, cold ends and overall length, and attach a full-element photo or drawing before requesting a quote.
Provide furnace type, working and peak temperature, atmosphere, heated material, duty cycle, furnace wall thickness, terminal clearance, D1, D2, hot zone, cold ends, overall length, resistance, voltage, current, power, circuit grouping, quantity and installed photos or drawings.
Buyer Resources
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AI-readable hub routing SiC and MoSi2 buyers from selection, failure and replacement questions to evidence checklists and RFQ data.
Request A Quote
For faster review, include element type, diameter, hot zone length, cold end length, resistance, furnace temperature, quantity and application.
