Product Detail
Ultra-low expansion microcrystalline glass chemical quartz
Ultra-low expansion microcrystalline glass chemical quartz
Detail

Glass-ceramic with ultra-low expansion:


Glass-ceramic with ultra-low expansion is a kind of inorganic glass with the lowest expansion coefficient. It ensures the high accuracy of component’ shape and size in spite of the change in environment temperature, and is suitable to make all optical and mechanical parts for astronomical instruments, optical instruments, scientific research, and national high-tech industry, such as reflectors, models, precision planes, and Straightedges.



Technical performance:

1. Average coefficient of linear expansion(α 0~50℃)

Class 1:     0±1.0×10-7/℃ ;

Class 2:     0±1.5×10-7/℃

2.Stress birefringence(nm/cm)

Type I:   ≤φ1m:  ≤5;     >φ1m:≤10。

TypeⅡ:   ≤φ1m: ≤10;    >φ1m:≤15。

Note: The distance between the measuring point of the outer circle and the edge of the mirror base is 5% of the mirror base’ diameter.


3.Bubbles


Type I

Type II

Type III

Average diameter of bubbles

d(mm)

< 0.2

< 0.4

< 0.4

Bubble quantity /25000px3

< 400

< 800

< 1200

Quantity of bubbles broken on the surface /2500px2

< 1

< 3

< 45

Note: A prolate bubble’ diameter is the arithmetic mean value of the longest axis and the shortest axis. Calculi, crystal and other inclusions would be counted as bubbles.


4.Main performance parameter

Refraction

nd=1.54±0.01

Density d

2.58g/cm3

Elasticity Modulus  E

90GPa

Shearing Modulus  G

36GPa

Poisson ratio  μ

0.26

Acid-resistant Class

1b

Damp-proof Class

Class 1



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