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AC3495 Alumina Spheres (Al2O3)

Catalog No. AC3495
Material Al2O3
Dimensions 1-70 mm
Density 3.7 g/cm3
Synonyms Al2O3 Spheres, Aluminum Oxide Spheres, Inert Alumina Spheres

Stanford Advanced Materials (SAM) can provide Alumina product series. Alumina Sphere is a type of aluminum oxide ceramic products. SAM provides alumina ceramic products with high density, tight dimensional tolerance, and competitive prices.

Related products: Alumina plateAlumina custom parts, Alumina tube

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Alumina Spheres
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Alumina Spheres
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Material
Al2O3
Dimensions
1-70 mm
Density
3.7 g/cm3
Synonyms
Al2O3 Spheres, Aluminum Oxide Spheres, Inert Alumina Spheres
 
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Material
Carbon
Color
Black
 
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Composition
Al2O3, SiO2, Fe2O3, CaO, MgO, K2O, Na2O, etc.
Purity
Al2O3+SiO2: >92%
Operating Temperature
≤ 980-1580℃
Synonyms
Inert Al2O3 Ball, Inert Aluminum Oxide Ball
 
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Grade
AISI 1085
Form
Ball

FAQ

What is the difference between inert alumina balls and activated alumina balls?

This is a common point of confusion. Inert alumina balls are fully sintered, dense, and chemically stable. They do not participate in chemical reactions and are used primarily for catalyst bed support, tower packing, and grinding media. Activated alumina balls, on the other hand, are porous with high surface area and are used as adsorbents for applications like water defluoridation, drying, and arsenic removal. If you need mechanical support or inert filling, choose inert alumina balls; if you need adsorption capacity, choose activated alumina .

How do I select the right size of alumina spheres for my reactor?

Alumina spheres are typically used in graded layers (multiple sizes). The general principle is:

  • Bottom layer (support layer): Largest spheres (e.g., 25–70 mm) to provide mechanical strength and allow liquid/gas distribution.
  • Intermediate layers: Medium spheres (e.g., 10–20 mm) for transition.
  • Top layer (catalyst bed contact layer): Smallest spheres (e.g., 1–6 mm) to prevent catalyst leakage and ensure uniform flow distribution.

Proper grading reduces pressure drop, prevents hot spots, and extends catalyst life. Your reactor design and catalyst size will determine the optimal combination.

Alumina spheres are typically used in graded layers (multiple sizes). The general principle is: Bottom layer (support layer): Largest spheres (e.g., 25–70 mm) to provide mechanical strength and allow liquid/gas distribution. Intermediate layers: Medium spheres (e.g., 10–20 mm) for transition. Top

No. High-purity, fully sintered alumina spheres are chemically inert under most operating conditions. They do not react with acids, alkalis, organic solvents, or process gases. They will not leach impurities into your product stream or interfere with catalyst activity. However, lower-grade ceramics with higher silica content may leach silica, which can poison certain catalysts. For sensitive processes, always use high-purity (≥99%) alumina spheres.

No. High-purity, fully sintered alumina spheres are chemically inert under most operating conditions. They do not react with acids, alkalis, organic solvents, or process gases. They will not leach impurities into your product stream or interfere with catalyst activity. However, lower-grade ceramics

Under normal operating conditions (stable temperature, no corrosive attack, within design pressure limits), inert alumina spheres can last 5 years or more. Many industrial plants go through multiple catalyst replacement cycles without changing the support ball layer. However, replacement is recommended if:

  • The catalyst is being changed in a highly corrosive environment
  • The spheres show signs of cracking, spalling, or powdering
  • There is evidence of scale buildup or fouling that cannot be cleaned

Reusing old spheres is not recommended because their mechanical strength degrades over time from thermal cycling and exposure, even if they appear intact on the surface.

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