Highlights of Silicon Carbide Seal Ring
Compared to traditional materials like metal or graphite, silicon carbide seal rings are a lightweight ceramic with exceptional hardness comparable to diamond but much lower in density. They feature excellent thermal conductivity, high mechanical strength, low thermal expansion, outstanding chemical resistance, and superior thermal shock resistance.
Because of these advantages, silicon carbide seal rings are widely used in various fields:
- Chemical processing equipment
- Fluid handling systems
- Energy and power generation
- Food manufacturing machinery
- Gas production units
- Precision machining tools
- Pumping systems
- Slurry and abrasive material handling
- Water treatment facilities
Wide Types for Silicon Carbide Seal Ring
Silicon carbide seal rings are an efficient material for applications where high wear and corrosion resistance are required.
Silicon Carbide Stationary RingCooperate with the dynamic ring to form a sealing surface.
Silicon Carbide Rotary Seal RingInstalled on the rotating shaft and fits in with the sealing surface of the static ring.
Silicon Carbide Mechanical SealHigh wear resistance, corrosion resistance, good sealing.
Good wear resistance and self-lubrication, reduce friction coefficient and energy loss.
Silicon Carbide PlungerHigh surface finish and good sealing, effectively prevent medium leakage.
Features and Applications of Silicon Carbide Seal Ring
Silicon carbide seal ring is mainly used in various high-precision machinery, for high temperature resistance, corrosion resistance, oxidation resistance, and wear resistance.
Mohs hardness >9, Vickers hardness >2500 HV.
Lighter than metal rings, suitable for high-speed rotating parts.
Resistant to strong acids (except hydrofluoric acid), strong alkalis and high temperature oxidation (up to 1600℃).
Bending strength 400 MPa, better for compression and impact resistance.
Why Choose Newthink Silicon Carbide Seal Ring?
Choosing NEWTHINK silicon carbide seal ring can provide customers with long service life, low-maintenance solutions, helping to ensure stable operation under harsh working conditions.
We use high-purity silicon carbide raw materials to make silicon carbide seal rings with a density of up to 3.16g/cm3.
Machining accuracy can reach 0.01mm, surface finish can reach Ra0.03.
We implement precise and efficient production to control costs and provide our clients with efficient and money-saving solutions.
Quickly respond to customer requests and make suggestions based on drawings.
ISO certified, 100% full inspection to ensure no cracks, no defects, and ensure stable and reliable quality.
Successfully applied to chemical, photovoltaic, military, semiconductor and other industry fields.
Silicon Carbide Seal Ring Production Workshop
With over 14 years of experience in advanced ceramics, Newthink specializes in manufacturing high-performance silicon carbide seal rings using precision equipment for forming, sintering, and surface finishing. We offer both reaction bonding and pressureless sintering to meet diverse application needs. From prototypes to mass production, every step—from shaping to final polishing—is strictly controlled to ensure consistent quality, dimensional accuracy, and long-term durability.
Meet Us at Exhibitions and Factory Visits
Newthink actively participates in major industrial and advanced ceramics exhibitions worldwide throughout the year, such as TECNA in Italy, CERAMITEC in Germany and Vietnam, Highly-functional Ceramic Expo in Japan, meeting directly with our customers.
Our doors are always open—you’re warmly invited to visit our factory, witnessing firsthand our dedication to quality. Through frequent interactions and strong relationships built at these global events and visits, we’ve earned deep trust from clients in over 40 countries and regions.
Technical Data of Silicon Carbide Seal Ring
Our company provides different silicon carbide seal rings to meet the various requirements of the clients from domestic and abroad markets.
- RBSiC & SSiC
- Comparison of corrosion resistance parameters of different SiC materials
| Item | Unit | SSiC | RBSiC |
| Density | g/cm3 | 3.08-3.16 | 2.9-3.02 |
| Hardness HV1 | Kg/mm2 | >2550 | >2350 |
| Young’s Modulus | GPa | 410 | 400 |
| Bending Strength (1200℃) | MPa | 400 | 280 |
| Compressive Strength | MPa | >2500 | >2250 |
| Coefficient of Linear Expansion | 10–⁶/K | 4.0-4.5 | 4.3-4.8 |
| Max Working Temperature | ℃ | 1650 | 1380 |
| Test Environment (Conc. Reagent) | Temp (°C) | Corrosive Weight Loss (No Free SiC) (mg/cm²·yr) | Corrosive Weight Loss (12% SiC) (mg/cm²·yr) |
| 98% H₂SO₄ | 100 | 1.8 | 55 |
| 50% NaOH | 100 | 2.6 | >1000 |
| 53% HF | 25 | <0.2 | 7.9 |
| 85% H₃PO₄ | 100 | <0.2 | 8.8 |
| 70% HNO₃ | 100 | <0.2 | 0.5 |
| 45% KOH | 100 | <0.2 | >1000 |
| 25% HCl | 70 | <0.2 | >1000 |
| 10% HF + 57% HNO₃ | 25 | <0.2 | >1000 |
Related Products
Silicon Carbide Sliding BearingFor high load and high speed requirements.
Silicon Carbide Oil SealGood wear resistance and oil resistance.
Silicon Carbide Piston RingUsed in internal combustion engines, compressors and other equipments.
- High hardness, can resist the erosion of particles in high-speed fluid.
- It has high compressive strength and bending strength, and can withstand high pressure without deformation.
- Good toughness makes it not easy to break when subjected to certain impact or vibration, and can better adapt to complex working conditions.
- Low friction coefficient helps to reduce the friction power consumption between the sealing surfaces and reduce the energy consumption of equipment operation.
This is a common fault. The following are common solutions: Select the type of silicon carbide seal ring strictly according to the working conditions (pressure, temperature, medium, speed); use a laser alignment instrument to calibrate to ensure concentricity; use double-end seals and add isolation fluid, preferably silicon carbide on silicon carbide wear-resistant combination, formulate a preventive maintenance plan, and train personnel to standardize operations.
The function of a silicon carbide gasket is to provide a seal between two components or flanges that have flat surfaces. A silicon carbide seal ring crafted from silicon carbide (SiC) is identified as a part that interfaces between engine mechanisms, pumps, and rotating shafts. Gaskets serve the purpose of providing non-moving seals. Silicon Carbide seal rings placed between engine parts, pumps, or rotating shafts are called dynamic seals because they manage fluid containment during movement.
The role of the silicon carbide seal ring is to ensure a safe and reliable seal ring between two mating surfaces, prevent liquid or gas leakage, prevent contaminants from entering, maintain normal function, and improve safety.
Silicon carbide seal achieves sealing through the relative rotation of two precisely matched rings (static seal ring and dynamic seal ring) to prevent leakage of media in the pump. The ultra-hardness and wear resistance of silicon carbide (hardness 2500 HV) can effectively reduce wear and tear; its service life is 3 to 5 times longer than alumina. Silicon carbide seal rings achieve zero leakage and long service life in high-speed, high-pressure, and corrosive environments through the combination of material hardness + chemical inertness + thermal stability, and the reliability is improved by more than 50% compared with traditional seals (such as tungsten carbide/graphite).
