ALON® is an amazing new advanced ceramic based on a composition of aluminum oxynitride with a cubic spinel crystal structure. It is hard, durable, and transparent in the near-ultraviolet and visible through the mid-infrared spectrum. ALON® is commercially synthesized and manufactured by Surmet Corporation, the global leader in transparent optical ceramics technologies. Surmet is vertically integrated and synthesizes tonnage quantities of high purity ALON® powder for its own use.

Surmet is a supplier of ALON® optical windows, domes, plates, rods and tubes for advanced applications. Fabricated ALON® products combine superior mechanical and optical properties (matching those of sapphire) with the added advantages of an isotropic cubic crystal structure. ALON® is an ideal material for applications requiring high strength light-weight durability and transparency in the face of world's most demanding environments.


ALON® Optical Ceramic

  • Optically transparent from near-UV to mid-IR wavelengths (0.25 to 4.6 μm)
  • Excellent clarity
  • Total absence of birefringence
  • Outstanding hardness and high strength
  • Low internal stress
  • Available in a wide variety of sizes, shapes and thicknesses
  • Produced using proven ceramic forming processes
  • Readily scaled up to high volumes
  • Cost effective advanced material solution
  • Applicable to a wide variety of industries including aerospace, security,  defense and Semiconductor, Energy and consumer products.


ALON® Optical Ceramic Publications

ALON® Optical Ceramic Transparencies for Sensor and Armor Applications

Recent Advances in ALON® Optical Ceramic

Characterization of ALON® Optical Ceramic

ALON® Optical Ceramic Properties

Grain Size (typical):
150-250 microns
Cubic, Spinel
Lattice Constant:
7.956A - 7.936A
3.696 - 3.691 g/cc
Melting Point:
Young's Modulus:
46.9x106 psi
Shear Modulus:
18.9x106 psi
Poisson's Ratio:
1850 kg/mm2 (Knoop Indent, 200g)
Fracture Toughness:
2.0 MPa-m1/2
Flexure Strength:
55,000 psi
Specific Heat:
0.22 cal/g-°C
Transmission Limits:
0.22 to 6 microns