THIN PLATE GLASS MIRROR BLANKS

(APPROXIMATE MEASUREMENTS)

DESCRIPTION

DIAMETER

THICKNESS

WEIGHT

PART #

4.25"

.700"

0.95

TPG450

5.00"

.700"

1.25

TPG500

6.00"

.800"

2.25

TPG600

8.00"

1.100"

5.25

TPG800

10.00"

1.300"

5.25

TPG1000

12.50"

1.500"

17.00

TPG1250

13.10

1.500"

18.00

TPG1310

Thin plate glass mirror blanks are similar in size to the mirror blanks used by the large domestic manufacturers on some of their commercial telescopes. In an effort to reduce the weight and cost of the blanks used, the manufacturers have not followed the historical rule-of-thumb that a diameter to thickness ratio should be 6:1. The manufacturers have determined over time that they can maintain the quality of their products by reducing the diameter thickness ratio to between 8:1 to 10:1 depending on the blanks weight. In addition, some of the manufacturers have switched from Pyrex to plate glass without sacrificing the quality they have wished to maintain on certain product lines. As in use of thin Pyrex blanks, the manufacturers have given more attention to reducing the risk of flexure (which cause image distortion) by redesigning their mirror cell.

The thin mirrors provided above are molded blanks that are fine annealed and have been ground flat on one surface.

CUSTOM THIN BLANKS

Other thin mirror blanks can be made to the fabricators specifications. Please submit a drawing with the dimensional specifications to facilitate our quotation process.