Borosilicate glass

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A type of glass containing at least 5% boron. Borosilicate glass was developed by German glassmaker Otto Schott in the late 19th century in Jena. Originally know as Jena Glass, Corning Glass Works introduced a similar product as Pyrex in 1915. The most common formulation contains 80% silica, 135 boric oxide, 4 %dsodiu oxide and 2-3 % aluminum oxide. Th;e addition of is highly resistant to heat and shock. It is used in the manufacture of glassware for labs and homes, commercially known as Pyrex.

(Physical parameters below are for Pyrex 7740)

Synonyms and Related Terms

vidrio de borosilicato (Esp.); verre au borosilicate (Fr.); borosilicaat glas (Ned.); vidro de borossilicato (Port.);

Commercial products: Pyrex; Corning 33; Corning 51 (Corning Glass Works); Boroflat (Schott AG); Duran (DURAN Group); International Cookware NIPOR BSA 60 and BSC 51; Jenaer Glass (Zwiesel Kristallglas)

Physical and Chemical Properties

Melting Point 820 C (softens)
Density 2.23 g/ml
Refractive Index 1.474

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 362
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997

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