Silicon Carbide Seal Rings | High-Performance SiC Ceramic Rings

Our Silicon Carbide Seal Rings (also called SiC ceramic seal rings or silicon carbide rings) are engineered to deliver superior sealing performance in extreme conditions. Combining outstanding hardness, corrosion resistance, and thermal stability, they serve as reliable components in demanding fluid and gas sealing systems.

Key Features & Advantages

  • Exceptional Wear Resistance
    Silicon carbide offers hardness close to diamond, giving the seal rings long life even under abrasive contact.
  • High Thermal & Mechanical Stability
    The rings maintain integrity under high temperatures and thermal shock, ensuring consistent sealing performance.
  • Excellent Chemical Resistance
    Whether in acidic, alkaline, or corrosive environments, SiC seal rings resist attack and preserve surface quality.
  • Low Thermal Expansion & High Conductivity
    Minimal expansion reduces distortion during heating, and good heat transfer helps dissipate thermal stresses.
  • Versatile Ring Types
    Available in dynamic (rotating) rings, static rings, flat rings, and stepped profiles to suit your sealing design.

Materials & Performance Specs

Material Type

Maximum Service Temp*

Bulk Density (g/cm³)

Flexural Strength

Hardness

Thermal Conductivity

CTE (×10⁻⁶ /K)

Pressureless Sintered SiC (SSiC)

~ 1600 °C

~ 3.10

~ 400 MPa

~ HRA 92

~100–120 W/m·K

~4.0

Reaction-Bonded SiC (RBSiC)

~ 1380 °C

~ 3.03

~ 350 MPa

—

~50–100 W/m·K

~4.5

* These are typical maximums under ideal conditions; actual performance depends on application parameters.

Other traits include low porosity (<0.2 %), fracture toughness, high compressive strength, and stability over time under cyclic loading.

Typical Applications

Silicon carbide seal rings are commonly used in:

  • Mechanical Seal Assemblies – for pumps, compressors, agitators
  • Valve Seals & Seats – providing tight sealing even under corrosive fluid flow
  • Rotating Equipment – when paired with mating materials to form durable sealing surfaces
  • Chemical Processing & Petrochemistry – resisting acids, alkalis, and aggressive media
  • High-Temperature Systems – where conventional materials degrade

They excel particularly where traditional metallic or carbon rings cannot maintain performance over extended use.

Design & Customization Options

To meet your exact sealing needs, we offer:

  • Ring geometries: flat, single- or double-stepped, custom profiles
  • Surface finishes: mirror polishing, lapping, or engineered micro-topography
  • Dimensional tolerances for OD, ID, thickness, cylindricity
  • Special shapes: cutouts, recesses, grooves as needed
  • Small or large batch production, with full material certifications

Quality Assurance & Manufacturing

  • Strict quality control at every step ensures consistency
  • Material traceability and test reports provided
  • Expert technical support to help you select the correct SiC ring grade
  • Careful packaging to prevent damage during transport and handling

Packaging & Delivery

Each silicon carbide seal ring is individually packaged with protective padding and moisture barriers, then crated or boxed properly for safe shipment, especially for delicate or precision components.