Learning on ScreenSynthetic Sapphire
- Synopsis
- Examples of synthetic sapphires in use. The manufacturing process. Ammonium alum is reduced in a furnace to aluminium oxide. After sifting through fine gauze the powder is melted in an oxyhydrogen flame in a special furnace at a temperature of 2000 degrees C. The molten aluminium oxide builds up in a fire-clay candle to form a sapphire ‘boule’, which on cooling is split to form the raw material from which industrial sapphires are cut.
- Language
- English
- Country
- Great Britain
- Medium
- Film; Film. 16mm. sd. b&w. 7 min.
- Technical information
- Black-and-white / Sound
- Year of production
- 1956
- Availability
- Hire
- Notes
- Archival interest.
- Uses
- Introductory courses*
- Subjects
- Chemistry
- Keywords
- gemstones; sapphires; synthetic gemstones
Distribution Formats
- Type
- Film
- Format
- 16mm
Production Company
Distributor
- Name
Higher Education Film & Video Library
- services@bufvc.ac.uk
- Web
- http://bufvc.ac. External site opens in new window
- Phone
- 020 7393 1503
- Fax
- 020 7393 1555
- Address
- c/o British Universities Film & Video Council
77 Wells Street
London
W1T 3QJ - Notes
- Catalogue available from British Universities Film & Video Council.
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