Silicon Carbide Heating Elements

High-performance SiC heaters for industrial furnaces up to 1600–1650 °C, available in straight, U, W, dumbbell and spiral-groove designs. Engineered for fast heat-up, stable resistance at working temperature, and long service life.

SiC electric heating elements (silicon carbon rods) are made of high-purity green SiC as raw material and are made by high-temperature recrystallization at 2200°C.Its resistance decreases with increasing temperature and changes with the use time, but when used for a long time, a layer of SiO₂ protective film will form on the surface, which helps to stabilize the resistance and extend the service life. SiC electric heating elements have excellent high temperature resistance, oxidation resistance, and corrosion resistance.They are suitable for industrial applications such as high-temperature heating and precision temperature control, and have high thermal efficiency and uniform heating.

Property	Value	Conditions/Notes
Density	2.5 g/cm³	Theoretical density
Bulk Density	–	(Not specified)
Porosity	23%	Affects thermal shock resistance
Thermal Conductivity	14-19 W/(m·K)	@ 1000°C
Flexural Strength	50 MPa	@ 25°C (room temp)
Specific Heat	1.0 kJ/(kg·K)	25-1300°C range
Coeff. of Thermal Expansion	4.5 × 10⁻⁶ /K	@ 1000°C

Features:
Silicon carbide heating elements offer advantages such as corrosion resistance to acids and alkalis, strong oxidation resistance, high surface load density for fast heating, good thermal shock resistance, low coefficient of thermal expansion, high thermal conductivity, high operating temperature, and long lifespan.

Applications：
Metal industry: Heat treatment of various metals, carburizing and nitriding treatment, and sintering of powder metallurgy.

Electronics and semiconductor industry: Sintering of components such as resistors, capacitors, and ceramic substrates, metallization of substrates, optical fiber heat treatment, etc.

Ceramic and glass industry: Various ceramic sintering, glass melting and surface treatment, as well as ceramic and glass fiber manufacturing.

Chemical industry: Sintering of various coating materials and other chemicals, heating of chemical reactants, etc.

Laboratory analysis: Testing under high-temperature conditions, as well as thermal analysis.

Type	Features	Application Scenarios
Equal Diameter SiC Rod	Uniform diameter, even heat distribution	Box furnaces, laboratory furnaces
Single Thread SiC Rod	Spiral structure, increased heating area	High-temperature sintering, ceramic firing
U-shaped SiC Rod	Bent into a U-shape, space-saving	Tube furnaces, small heating equipment
W-shaped SiC Rod	Complex shape, longer heating path	Large industrial furnaces, glass melting furnaces
Thick-End SiC Rod	Thicker ends, increased mechanical strength	High load, vibrating environments
Double Thread SiC Rod	Dual spiral structure, higher heating efficiency	High-efficiency, high-temperature heating needs

Single Spiral Heating Type	OD / mm	Heating zone / mm	Cold zone/ mm	Overall length /mm	Hot zone surface area / cm²	voltage / V	Power / W	Range of resistance Ω （±20%）	Purity
AT-THG-BA001	14	200	200	600	87	59	1650	2.11	99%
AT-THG-BA002	14	200	250	700	87	60	1680	2.14	99%
AT-THG-BA003	14	250	200	650	109	71	1990	2.53	99%
AT-THG-BA004	14	250	250	750	109	73	2040	2.61	99%
AT-THG-BA005	14	300	250	800	131	85	2380	3.04	99%
AT-THG-BA006	16	200	250	700	100	58	1970	1.71	99%
AT-THG-BA007	16	250	200	650	125	69	2350	2.03	99%
AT-THG-BA008	16	250	250	750	125	70	2380	2.06	99%
AT-THG-BA009	16	250	300	850	125	71	2410	2.09	99%
AT-THG-BA010	16	300	200	700	150	81	2750	2.39	99%
AT-THG-BA011	16	300	250	800	150	82	2790	2.41	99%
AT-THG-BA012	16	300	300	900	150	83	2820	2.44	99%
AT-THG-BA013	16	350	250	850	175	94	3200	2.76	99%
AT-THG-BA014	16	350	300	950	175	95	3230	2.79	99%
AT-THG-BA015	20	300	400	1100	188	84	3440	2.05	99%
AT-THG-BA016	20	350	400	1150	219	97	3980	2.36	99%
AT-THG-BA017	20	400	400	1200	251	109	4470	2.66	99%
AT-THG-BA018	20	450	400	1250	282	121	4960	2.95	99%
AT-THG-BA019	25	300	400	1100	235	84	4120	1.71	99%
AT-THG-BA020	25	300	500	1300	235	86	4210	1.76	99%
AT-THG-BA021	25	400	400	1200	314	110	5390	2.24	99%
AT-THG-BA022	25	500	400	1300	392	135	6620	2.75	99%
AT-THG-BA023	30	300	400	1100	282	79	4980	1.25	99%
AT-THG-BA024	30	300	500	1300	282	80	5040	1.27	99%
AT-THG-BA025	30	400	400	1200	376	103	6490	1.63	99%
AT-THG-BA026	30	400	500	1400	376	104	6550	1.65	99%
AT-THG-BA027	30	500	400	1300	471	127	8000	2.02	99%
AT-THG-BA028	30	600	400	1400	565	151	9510	2.4	99%
AT-THG-BA029	35	400	400	1200	439	101	7680	1.33	99%
AT-THG-BA030	35	400	500	1400	439	102	7750	1.34	99%
AT-THG-BA031	35	500	400	1300	549	124	9420	1.63	99%
AT-THG-BA032	35	500	500	1500	549	125	9500	1.64	99%
AT-THG-BA033	35	600	400	1400	659	148	11200	1.96	99%
AT-THG-BA034	35	700	400	1500	769	171	13000	2.25	99%
AT-THG-BA035	40	500	400	1300	628	116	10700	1.26	99%
AT-THG-BA036	40	500	500	1500	628	117	10800	1.27	99%
AT-THG-BA037	40	600	400	1400	753	138	12700	1.5	99%
AT-THG-BA038	40	700	400	1500	879	161	14800	1.75	99%
AT-THG-BA039	45	700	450	1600	989	149	16800	1.32	99%
AT-THG-BA040	45	800	400	1600	1130	168	19000	1.49	99%

Double Spiral Heating Type	OD (mm)	Heat zone (mm)	Cold zone (mm)	Overall length (mm)	Heating zone (cm²)	voltage (V)	Power (W)	Range of resistance Ω (±20%)	Purity
AT-THG-BB001	16	100	150	250	50	61	940	3.96	99%
AT-THG-BB002	16	100	200	300	50	69	1060	4.49	99%
AT-THG-BB003	16	150	150	300	75	84	1290	5.47	99%
AT-THG-BB004	16	150	250	400	75	99	1520	6.45	99%
AT-THG-BB005	16	200	200	400	100	113	1740	7.34	99%
AT-THG-BB006	16	250	200	450	125	135	2080	8.76	99%
AT-THG-BB007	20	100	150	250	62	58	1110	3.03	99%
AT-THG-BB008	20	100	250	350	62	72	1380	3.76	99%
AT-THG-BB009	20	150	200	350	94	87	1670	4.53	99%
AT-THG-BB010	20	200	200	400	125	109	2090	5.68	99%
AT-THG-BB011	20	250	150	400	157	124	2380	6.46	99%
AT-THG-BB012	20	250	250	500	157	138	2650	7.19	99%
AT-THG-BB013	20	300	250	550	188	160	3070	8.34	99%
AT-THG-BB014	25	150	200	350	117	87	2000	3.78	99%
AT-THG-BB015	25	200	200	400	157	110	2530	4.78	99%
AT-THG-BB016	25	200	300	500	157	121	2780	5.27	99%
AT-THG-BB017	25	300	300	600	235	167	3840	7.26	99%
AT-THG-BB018	25	300	400	700	235	179	4120	7.78	99%
AT-THG-BB019	25	350	300	650	274	191	4390	8.31	99%
AT-THG-BB020	25	400	300	700	314	214	4920	9.31	99%
AT-THG-BB021	30	200	200	400	188	190	2790	2.9	99%
AT-THG-BB022	30	250	200	450	235	111	3440	3.58	99%
AT-THG-BB023	30	300	300	600	282	132	4090	4.26	99%
AT-THG-BB024	30	350	350	700	329	153	4740	4.94	99%
AT-THG-BB025	30	400	400	800	376	174	5390	5.62	99%
AT-THG-BB026	30	450	350	800	424	194	6010	6.26	99%
AT-THG-BB027	30	500	300	800	471	214	6630	6.91	99%
AT-THG-BB028	35	200	200	400	219	89	3260	2.43	99%
AT-THG-BB029	35	250	200	450	274	109	3990	2.98	99%
AT-THG-BB030	35	300	300	600	329	130	4760	3.55	99%
AT-THG-BB031	35	400	300	700	439	171	6260	4.67	99%
AT-THG-BB032	35	450	350	800	494	191	6990	5.22	99%
AT-THG-BB033	35	500	300	800	549	211	7720	5.77	99%
AT-THG-BB034	40	200	200	400	251	86	3660	2.02	99%
AT-THG-BB035	40	250	200	450	314	106	4510	2.49	99%
AT-THG-BB036	40	300	300	600	376	127	5400	2.99	99%
AT-THG-BB037	40	350	300	650	439	147	6250	3.46	99%
AT-THG-BB038	40	400	300	700	502	167	7100	3.93	99%
AT-THG-BB039	40	400	400	800	502	167	7100	3.93	99%
AT-THG-BB040	40	450	300	750	565	186	7910	4.37	99%
AT-THG-BB041	40	450	350	800	565	187	7950	4.4	99%
AT-THG-BB042	40	500	300	800	628	206	8760	4.84	99%

Sic Heating Element -Rod	Small side OD / mm	Heat zone length / mm	Cold zone length / mm	large side OD / mm	Range of resistance / Ω	Purity
AT-THG-BD001	8	180	60	14	2.6-5.2	99%
AT-THG-BD002	8	180	150	14	2.6-5.2	99%
AT-THG-BD003	8	150	150	14	2.2-4.5	99%
AT-THG-BD004	8	180	180	14	2.6-5.2	99%
AT-THG-BD005	8	200	150	14	2.9-5.8	99%
AT-THG-BD006	12	150	200	20	1.1-2.2	99%
AT-THG-BD007	12	200	200	20	1.4-2.9	99%
AT-THG-BD008	12	250	200	20	1.8-3.8	99%
AT-THG-BD009	14	180	150	22	1.3-2.3	99%
AT-THG-BD010	14	150	250	22	0.9-1.8	99%
AT-THG-BD011	14	200	250	22	1.2-2.3	99%
AT-THG-BD012	14	250	250	22	1.5-3.0	99%
AT-THG-BD013	14	300	250	22	1.8-3.5	99%
AT-THG-BD014	14	400	350	22	2.3-4.7	99%
AT-THG-BD015	18	300	250	28	1.1-2.2	99%
AT-THG-BD016	18	300	350	28	1.1-2.2	99%
AT-THG-BD017	18	400	250	28	1.4-2.9	99%
AT-THG-BD018	18	500	350	28	1.8-3.6	99%
AT-THG-BD019	18	600	350	28	2.1-4.3	99%
AT-THG-BD020	18	400	400	28	1.4-2.9	99%
AT-THG-BD021	25	400	400	38	0.8-1.7	99%
AT-THG-BD022	25	600	500	38	1.3-2.6	99%
AT-THG-BD023	25	800	450	38	1.7-3.4	99%
AT-THG-BD024	25	500	400	45	0.6-1.2	99%
AT-THG-BD025	30	1000	500	45	1.1-2.2	99%
AT-THG-BD026	30	1200	500	45	1.3-2.6	99%
AT-THG-BD027	40	1000	500	56	0.8-1.7	99%
AT-THG-BD028	40	1500	500	56	1.3-2.6	99%
AT-THG-BD029	40	2400	700	56	2.0-4.0	99%
AT-THG-BD030	40	2600	850	56	2.2-4.4	99%

Sic Heating Element Type	OD / mm	Heating zone length / mm	Cold zone length / mm	Range of resistance / Ω	Purity
AT-THG-BC001	14	200	250	1.2-1.3	99%
AT-THG-BC002	14	250	250	1.5-3.0	99%
AT-THG-BC003	14	300	250	1.8-3.5	99%
AT-THG-BC004	14	400	350	2.3-4.7	99%
AT-THG-BC005	14	500	350	2.9-5.9	99%
AT-THG-BC006	16	200	200	0.9-1.9	99%
AT-THG-BC007	16	250	200	1.2-2.4	99%
AT-THG-BC008	16	300	300	1.4-2.8	99%
AT-THG-BC009	18	250	250	0.9-1.8	99%
AT-THG-BC010	18	300	350	1.1-2.2	99%
AT-THG-BC011	18	400	250	1.4-2.9	99%
AT-THG-BC012	18	500	350	1.8-3.6	99%
AT-THG-BC013	20	200	200	0.6-1.2	99%
AT-THG-BC014	20	250	250	0.7-1.4	99%
AT-THG-BC015	20	300	300	0.8-1.6	99%
AT-THG-BC016	20	400	350	1.1-2.2	99%
AT-THG-BC017	20	500	400	1.4-2.8	99%
AT-THG-BC018	20	600	350	1.5-3.0	99%
AT-THG-BC019	25	300	400	0.6-1.3	99%
AT-THG-BC020	25	400	400	0.8-1.7	99%
AT-THG-BC021	25	500	400	1.1-2.2	99%
AT-THG-BC022	25	600	500	1.3-2.6	99%
AT-THG-BC023	25	800	450	1.7-3.4	99%
AT-THG-BC024	25	900	400	1.9-3.8	99%
AT-THG-BC025	25	1000	500	2.2-4.5	99%
AT-THG-BC026	30	400	400	0.5-0.9	99%
AT-THG-BC027	30	500	400	0.6-1.2	99%
AT-THG-BC028	30	1000	500	1.1-2.2	99%
AT-THG-BC029	30	1200	500	1.3-2.6	99%
AT-THG-BC030	30	1300	500	1.4-2.9	99%
AT-THG-BC031	30	1500	250	1.6-3.4	99%
AT-THG-BC032	30	1500	300	1.6-3.4	99%
AT-THG-BC033	30	1500	600	1.6-3.4	99%
AT-THG-BC034	30	2000	650	2.2-4.4	99%
AT-THG-BC035	35	400	400	0.4-0.8	99%
AT-THG-BC036	35	500	400	0.5-1.0	99%
AT-THG-BC037	35	1000	500	1.0-2.0	99%
AT-THG-BC038	35	1200	500	1.1-2.2	99%
AT-THG-BC039	35	1500	500	1.4-2.8	99%
AT-THG-BC040	40	400	400	0.3-0.7	99%
AT-THG-BC041	40	1000	500	0.8-1.7	99%
AT-THG-BC042	40	1500	500	1.3-2.6	99%
AT-THG-BC043	40	2000	650	1.7-3.4	99%
AT-THG-BC044	40	2400	700	2.0-4.0	99%
AT-THG-BC045	40	2600	850	2.2-4.4	99%

Three Phase Type	Heat zone OD / mm	Heating zone length / mm	Cold zone Length / mm	center distance / mm	Bridge OD / mm	Overall length / mm	Purity
AT-THG-BF001	14	200	250	40	14	54	99%
AT-THG-BF002	14	250	300	50	14	64	99%
AT-THG-BF003	14	300	350	60	14	74	99%
AT-THG-BF004	16	200	250	40	16	56	99%
AT-THG-BF005	16	250	300	50	16	66	99%
AT-THG-BF006	16	300	350	60	16	76	99%
AT-THG-BF007	18	300	350	60	18	78	99%
AT-THG-BF008	18	400	400	70	18	88	99%
AT-THG-BF009	18	500	450	75	18	93	99%
AT-THG-BF010	20	250	300	50	20	70	99%
AT-THG-BF011	20	300	350	60	20	80	99%
AT-THG-BF012	20	400	400	70	20	90	99%
AT-THG-BF013	25	400	400	70	25	95	99%
AT-THG-BF014	25	500	450	75	25	100	99%
AT-THG-BF015	25	600	500	80	25	105	99%
AT-THG-BF016	30	600	400	70	30	100	99%
AT-THG-BF017	30	700	450	75	30	105	99%
AT-THG-BF018	30	800	500	80	30	110	99%

U-type Heating Elements	Heating zone OD / mm	Heating zone Length / mm	Cold zone Length / mm	center distance / mm	Bridge OD / mm	Overall length / mm	Range of resistance / Ω	Purity
AT-THG-BU001	14	200	250	40	14	54	2.4-4.6	99%
AT-THG-BU002	14	250	300	50	14	64	3.0-6.0	99%
AT-THG-BU003	14	300	350	60	14	74	3.6-7.0	99%
AT-THG-BU004	16	200	250	40	16	56	1.4-2.8	99%
AT-THG-BU005	16	250	300	50	16	66	1.8-3.6	99%
AT-THG-BU006	16	300	350	60	16	76	2.0-5.0	99%
AT-THG-BU007	18	300	350	60	18	78	2.0-5.0	99%
AT-THG-BU008	18	400	400	70	18	88	2.8-5.8	99%
AT-THG-BU009	18	500	450	75	18	93	3.6-7.2	99%
AT-THG-BU010	20	250	300	50	20	70	1.8-3.6	99%
AT-THG-BU011	20	300	350	60	20	80	2.0-5.0	99%
AT-THG-BU012	20	400	400	70	20	90	2.8-5.8	99%
AT-THG-BU013	25	400	400	70	25	95	1.6-3.4	99%
AT-THG-BU014	25	500	450	75	25	100	2.2-4.4	99%
AT-THG-BU015	25	600	500	80	25	105	2.6-5.2	99%
AT-THG-BU016	30	600	400	70	30	100	1.4-2.8	99%
AT-THG-BU017	30	700	450	75	30	105	1.6-3.2	99%
AT-THG-BU018	30	800	500	80	30	110	1.8-3.6	99%

1) What furnace temperature can SiC elements reach?

Straight one-piece elements are typically used up to ~1600 °C; spiral types up to ~1650 °C. Atmosphere and watt loading affect limits; see derating guidance.

2) Why measure resistance hot, not at room temperature?

SiC resistance varies significantly from ambient to ~800 °C and stabilizes above ~900 °C. Measure at ≥1000 °C for a meaningful working value.

3) How does atmosphere affect life?

Air and inert gases allow higher limits. Dry hydrogen and strong reducing atmospheres can remove the protective SiO₂ layer; use lower temperatures or protective measures.

4) Which type should I choose?

Straight for simplicity; U/W for compact multi-leg layouts and phase balance; dumbbell to reduce terminal losses; spiral groove for higher resistance and fine watt-density control; RA for constrained terminal routing.

5) What size ranges are typical?

Hot-zone diameters ~8–54 mm; overall lengths ~300–1800 mm; hot zones up to ~1500 mm, depending on type and supplier.

6) How do I power and control them?

Use SCR/thyristor control; design for resistance increase with aging. Keep phase loads balanced; match elements in series within tight resistance tolerance.

7) Can I run SiC elements in hydrogen?

They can run in certain H₂ mixtures but at reduced temperatures. Pure dry hydrogen generally requires much lower element temperature to maintain life.

8) What about voltage?

Common element designs cover ~110–480 V per circuit. Final voltage depends on element resistance (hot), wiring (series/parallel), and transformer/SCR selection.

9) Do spiral-groove elements behave differently?

Yes. The spiral groove increases hot-zone resistance and surface area, enabling different watt loading and control characteristics at high temperature.

10) What information do you need to quote?

Furnace model/dimensions, atmosphere, target setpoint, available power, desired element type, hot-zone length, OD, circuit scheme, and delivery deadline.

11) Can you provide matched sets and replacements?

Yes. We provide matched-resistance sets for series circuits and can replicate legacy dimensions, terminals, and cold-end lengths from drawings or samples.

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FAQ

What types of silicon carbide products does Zirsec supply?

Zirsec offers a wide range of SiC components including tubes, beams, plates, crucibles, rollers, sealing rings, and custom mechanical parts for industrial, chemical, and semiconductor applications.

Can Zirsec provide customized sizes or shapes?

Yes. We support OEM and customized production based on your drawings, specifications, or working conditions.

Do you provide samples for testing?

Yes, sample orders are available for standard items. For custom-made components, small batch samples can be produced after design confirmation.

How can I request a quotation?

Simply fill out the contact form on this page with product type, quantity, and specifications. Our sales engineer will send you a detailed quotation within 24 hours.

Does Zirsec offer technical consultation or design assistance?

Absolutely. Our engineers provide material selection guidance, structural optimization, and technical support for your specific applications.

How does Zirsec ensure product quality?

All products undergo strict inspection procedures, including dimensional accuracy, density, strength, and corrosion resistance tests before delivery.

Tell us your requirements

Our technical engineer will reply with a custom solution and quotation within one working day.

Silicon Carbide Heating Elements

Silicon Carbide Heating Element Overview