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- Sitall abstract "Sitall aka Sitall CO-115M or Astrositall, is a crystalline glass-ceramic with ultra low coefficient of thermal expansion (CTE). It was originally manufactured in the former Soviet Union and was used in the making of primary mirrors for the Russian Maksutov telescopes, but since dissolution has diminished in quality. Sitall has a CTE of only 0±1.5 x 10−7/°C in the temperature range -60 to 60°C, placing it in a rather small group of transparent materials with low CTE such as Pyrex, Zerodur, Cervit and fused quartz. Materials of low coefficient of thermal expansion are critical in the manufacture of optical elements for telescopes. In segmented mirror telescopes, it is desirable to have this coefficient as near zero as possible, and to have a high degree of homogeneity in the material. The Southern African Large Telescope (SALT) selected Sitall for the manufacture of its 91 primary mirror segments by Lytkarino Optical Glass Factory (LZOS). Using this company was a direct result of increased scientific collaboration between Russia and South Africa since 1994. Sitall was used for the primary and secondary mirrors of the VLT Survey Telescope.Sitall has been ballistically tested by The Pentagon for use as a complex composite armour system, intended to resist chemical and kinetic assault.".
- Sitall wikiPageExternalLink h130357571r06214.
- Sitall wikiPageExternalLink m116345328228845.
- Sitall wikiPageID "28147534".
- Sitall wikiPageLength "2919".
- Sitall wikiPageOutDegree "20".
- Sitall wikiPageRevisionID "633098561".
- Sitall wikiPageWikiLink Category:Glass-ceramics.
- Sitall wikiPageWikiLink Category:Glass_trademarks_and_brands.
- Sitall wikiPageWikiLink Category:Glass_types.
- Sitall wikiPageWikiLink Category:Low-expansion_glass.
- Sitall wikiPageWikiLink Category:Transparent_materials.
- Sitall wikiPageWikiLink Cer-Vit.
- Sitall wikiPageWikiLink Fused_quartz.
- Sitall wikiPageWikiLink Glass-ceramic.
- Sitall wikiPageWikiLink Lytkarino.
- Sitall wikiPageWikiLink Maksutov_telescope.
- Sitall wikiPageWikiLink Primary_mirror.
- Sitall wikiPageWikiLink Pyrex.
- Sitall wikiPageWikiLink Segmented_mirror.
- Sitall wikiPageWikiLink Southern_African_Large_Telescope.
- Sitall wikiPageWikiLink Soviet_Union.
- Sitall wikiPageWikiLink The_Pentagon.
- Sitall wikiPageWikiLink Thermal_expansion.
- Sitall wikiPageWikiLink VLT_Survey_Telescope.
- Sitall wikiPageWikiLink Zerodur.
- Sitall wikiPageWikiLinkText "Sitall".
- Sitall wikiPageUsesTemplate Template:Optics-stub.
- Sitall wikiPageUsesTemplate Template:Reflist.
- Sitall subject Category:Glass-ceramics.
- Sitall subject Category:Glass_trademarks_and_brands.
- Sitall subject Category:Glass_types.
- Sitall subject Category:Low-expansion_glass.
- Sitall subject Category:Transparent_materials.
- Sitall type Type.
- Sitall type Application.
- Sitall type Maker.
- Sitall type Type.
- Sitall comment "Sitall aka Sitall CO-115M or Astrositall, is a crystalline glass-ceramic with ultra low coefficient of thermal expansion (CTE). It was originally manufactured in the former Soviet Union and was used in the making of primary mirrors for the Russian Maksutov telescopes, but since dissolution has diminished in quality.".
- Sitall label "Sitall".
- Sitall sameAs Q7531629.
- Sitall sameAs m.0cm9hc6.
- Sitall sameAs Q7531629.
- Sitall wasDerivedFrom Sitall?oldid=633098561.
- Sitall isPrimaryTopicOf Sitall.