Statements (22)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
glass-ceramic material
|
| gptkbp:color |
yellowish
|
| gptkbp:composition |
lithium aluminosilicate glass-ceramic
|
| gptkbp:density |
2.53 g/cm³
|
| gptkbp:developedBy |
gptkb:Schott_AG
|
| gptkbp:firstProduced |
1968
|
| https://www.w3.org/2000/01/rdf-schema#label |
Zerodur glass ceramic
|
| gptkbp:manufacturer |
gptkb:Schott_AG
|
| gptkbp:marketedAs |
1968
|
| gptkbp:notableFor |
high dimensional stability
good machinability very low coefficient of thermal expansion |
| gptkbp:refractiveIndex |
1.542
|
| gptkbp:thermalExpansionCoefficient |
~0 ± 0.02 × 10⁻⁶/K
|
| gptkbp:usedFor |
precision optics
metrology equipment telescope mirrors |
| gptkbp:usedIn |
gptkb:Gran_Telescopio_Canarias_mirrors
gptkb:Keck_Observatory_mirrors Very Large Telescope mirrors |
| gptkbp:bfsParent |
gptkb:Keck_Telescope
|
| gptkbp:bfsLayer |
6
|