GB796961A - Improvements in or relating to the manufacture of opal glass - Google Patents
Improvements in or relating to the manufacture of opal glassInfo
- Publication number
- GB796961A GB796961A GB2793855A GB2793855A GB796961A GB 796961 A GB796961 A GB 796961A GB 2793855 A GB2793855 A GB 2793855A GB 2793855 A GB2793855 A GB 2793855A GB 796961 A GB796961 A GB 796961A
- Authority
- GB
- United Kingdom
- Prior art keywords
- glass
- temperature
- hours
- range
- manufacture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000011521 glass Substances 0.000 title abstract 8
- 238000004519 manufacturing process Methods 0.000 title abstract 3
- 239000011022 opal Substances 0.000 title abstract 2
- 229910004298 SiO 2 Inorganic materials 0.000 abstract 1
- 239000006063 cullet Substances 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 230000000717 retained effect Effects 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/11—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen
- C03C3/112—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Abstract
796,961. Glass manufacture. GENERAL ELECTRIC CO., Ltd., ELLIS, R. W., LEE, W. S., OSBORNE, D. G. S. M., and WEBSTER, H. Oct. 15, 1956 [Sept. 30, 1955], No. 27938/55. Class 56. In the manufacture of an opal glass to have the composition in the range by weight per cent of SiO 2 , 62À0-66À5; R 2 O 3 (where R is Al+Fe) 4À2-4À7; Na 2 O, 12À2-14À2; K 2 O, 0À6-2À6; CaO, 5À5-6À5; ZnO, 6À0-8À0; F 2 , 4À7-5À4 and possibly a trace of As, the ingredients are introduced into a glass melting furnace at a temperature in the range of 1440‹-1460‹C., the material is then brought to a founding temperature in the range of 1390‹-1430‹C. over a period of 2-3 hours and maintained for a further 3¢-4 hours, when the temperature is reduced to 1115‹Œ 10‹C. over a period of approximately 1 hour giving a glass with a coefficient of thermal expansion in the range of 9À35-9À85 x 10<SP>-6</SP> cm./cm./‹C. Preferably three parts of batch of raw materials and five parts of cullet, by weight, are used and added to some glass retained in the furnace after a previous working. The glass is suitable for incandescent lamp bulbs of wall thickness 1-1À5 mm. The glass is maintained at the working temperature for 15 hours, 11 hours actual working, and the residue then raised to the filling temperature of 1440‹- 1460‹C. Specification 675,776 [Group V] is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2793855A GB796961A (en) | 1955-09-30 | 1955-09-30 | Improvements in or relating to the manufacture of opal glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2793855A GB796961A (en) | 1955-09-30 | 1955-09-30 | Improvements in or relating to the manufacture of opal glass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB796961A true GB796961A (en) | 1958-06-25 |
Family
ID=10267688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2793855A Expired GB796961A (en) | 1955-09-30 | 1955-09-30 | Improvements in or relating to the manufacture of opal glass |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB796961A (en) |
-
1955
- 1955-09-30 GB GB2793855A patent/GB796961A/en not_active Expired
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