Machining / Grinding Crown Glass

CiDRA® Precision Services, LLC has years of experience manufacturing micron level tolerance products from Crown Glass. We leverage our in-depth dicing, drilling, milling, grinding, and polishing capability to manufacture the highest quality Crown Glass products. For those applications with exacting optical requirements, CiDRA® Precision Services, LLC has the ability to clean, polish, and apply coatings.

Whether you need prototypes or volumne production, CiDRA® Precision Services, LLC is here to help. Please contact us to discuss your applications.

About Crown Glass

Crown Glass is a low-index commercial-grade glass where the refractive index, transmission properties and homogeneity are controlled to a lower standard than that of optical grade glasses such as BK7.   Optical Crown Glass is suitable for applications in which component tolerances are fairly loose and as a substrate material for mirrors.

Crown Glass Applications

  • Lenses for achromatic doublets
  • Mirror substrates

 

Units

Crown Glass
Softening Point C 710
Annealing Point C 520
Strain Point C
Max Use Temperature C
Thermal Conductivity W/(m K) 0.84
Specific Heat J/(kg C) 770
Coefficient of Thermal Expansion 1/C (x10^-6) 6.5 - 9.3
Moh Hardness
Knoop Hardness kg/mm^2 520 - 610
Density g/cm^3 2.55
Compressive Strength MPa
Tensile Strength MPa
Bending Strength MPa
Young's Modulus GPa 71.5
Poisson's ratio 0.21
Dielectric Strength kv/cm
Dielectric Constant (@1MHz)
Dielectric Loss Tangent 0.0030
Resistivity ohm/cm
Usable Transmission Range um 0.35 - 2.5
Refractive Index (@550nm) 1.495-1.54
The information provided in this table is for room temperature only, and is a compilation of publicly available data.  This information is provided for comparison purposes only, and is not intended to be warrantable.   Further, CiDRA® Precision Services, LLC disclaims any and all liability from errors, inaccuracies, or omissions.

 

Please contact us if you would like to discuss your Crown Glass dicing, drilling, milling, grinding, polishing or any other machining applications.