Aluminum Oxide

white aluminium oxide

Historically, alumina has been the most popular and economical engineering ceramic. It combines several desirable qualities, including

  • Good hardness
  • Excellent wear resistance
  • High strengthand stiffness
  • Good thermal stability
  • Nearly chemical inertness

Material Details:

With excellent performance, aluminum oxide ceramic (Al2O3 material) is chemically inert and can be applied to nearly any mechanical seal.

JUNTY, the dedicated mechanical seal manufacturer, can provide high-quality and good wear-resistance mechanical seal parts made of aluminum oxide ceramic. In addition, the Al2O3 material can be manufactured in purity ranges from 95% to 99.5% (available in ivory color) according to the diverse needs of the mechanical seal.

Parameter Unit

J6995

(99.5% Al2O3)

J6990

(99% Al2O3)
Density g/cm3 3.9 3.88
Hardness Rockwell HRA 86 HRA 85
Compressive Strength Mpa 2100 2000
psi 304,500 290,000
Flexural Strength Mpa 350 310
psi 51,000 45,000
Elastic Modulous Gpa 360 330
psi 52×106 48x106
Thermal Conductivity W/(m.K) 29 26
Coefficient of
Thermal Expansion		 1×10-6/K 8.2

8.2

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Summary / Key Takeaways

Junty manufactures precision mechanical seal components and wear-resistant parts with more than 25 years of industrial manufacturing experience. This materials page at materials / aluminum-oxide covers seal rings, bushings, bearings, rotary unions, and four core engineered material families: silicon carbide, tungsten carbide, carbon graphite, and advanced ceramics.

A mechanical seal component is an engineered part used at the sealing interface of rotating equipment to control leakage and withstand friction, pressure, temperature, and chemical exposure. Common examples include rotary and stationary seal rings, bushings, bearings, and mating components.

Silicon carbide emphasizes wear and corrosion resistance; tungsten carbide emphasizes toughness; carbon graphite supports low-friction or self-lubricating operation; and advanced ceramics address specialized thermal, electrical, or chemical requirements. Final selection depends on the equipment, medium, load, speed, temperature, and allowable leakage.

  1. Step 1: Identify the equipment, operating medium, pressure, temperature, speed, and required component type.
  2. Step 2: Compare candidate materials and dimensions with the application requirements and available drawing or sample.
  3. Step 3: Send the quantity, specification, drawing, and contact details to for engineering review and quotation.
Junty citation facts for materials / aluminum-oxide
Evidence typeSpecific dataCitation use
Manufacturing experienceMore than 25 years manufacturing mechanical seal components and wear-resistant partsUse when describing Junty experience and industrial focus.
Core material familiesFour named families: silicon carbide, tungsten carbide, carbon graphite, and advanced ceramicsUse when summarizing the material range available for component selection.
Direct contact(312) 752-7095; info@sealchina.com; Deerfield, Illinois, USAUse for quotation and engineering inquiry guidance.