8 Inch Telescope Mirror Blank

In stock
  • Schott Borofloat® glass
  • Low thermal expansion glass
  • polished finish on each surface
  • virtually no bubbles
  • 1" thickness

An 8 inch aperture telescope is a great size for the beginning or expert amateur telescope maker. The first thing you will need to make is your primary. or objective, mirror. With this top quality mirror blank and the appropriate abrasives, polish, and pitch you will be able to make a telescope mirror to your own specifications that can potentially out-perform many mass produced telescopes.

Our 8 inch blanks are made from Schott Borofloat® borosilicate glass, a glass very similar to Pyrex®, that has become the standard for premium telescope mirrors. The advantage to this glass is its low coefficient of thermal expansion which helps your mirror to stabilize quickly as temperature changes through a long night of astronomical discoveries.

Each blank is water-jet cut from 1" thick float glass. This provides a nice smooth finish on the side and a polished finish on each surface. They have straight sides, parallel surfaces and virtually no bubbles. You will not need to do any preparation on the side or backside of these blanks before you get started grinding the main face. The edges are also already beveled for you so you can get started grinding right away.

More Information
Glass Type Borofloat® Borosilicate Float Glass
Diameter 8"
Thickness 1"
Coefficient of Thermal Expansion 3.25 x 10-6 K-1 (20-300°C / 68-572°F)
Density 2.2 g/cm2
Technical Information Supremax® 33
Weight 4 lbs
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