Graded Seal Glass Rod

Specialising in glasses with high melting temperatures, we are manufacturers of glass with intermediate expansions for graded seal applications in glass-to-glass and glass-to-metal seals, such as fused silica (quartz) to tungsten.

GS10 Graded Seal Glass Rod

Coefficient of Expansion 9.5 to 11.5 x 10-7 (temperature range 50° to 400°C). Other Properties Strain point 625°C Annealing point 750°C Softening point 1210°C Log _ 250 9.5 Log _ 350 7.9 Tk100 345°C Density 2.17 (at 4°C)

GS15 Graded Seal Glass Rod

Coefficient of Expansion 13.5-15.5 x 10-7 (temperature range 50 to 400 c). Other Properties Strain point 635°c Annealing point 740°c Softening point 1200°c Log _ 250 9.8 Log _ 350 8.2 Tk100 365°c

GS20 Graded Seal Glass Rod

Coefficient of Expansion 17.0 to 19.0 x 10-7 (temperature range 50o to 400°C). Other Properties Strain point 645°C Annealing point 730°C Softening point 1190°C Log _ 250 10.1 Log _ 350 8.5 Tk100 385°C

GS25 Graded Seal Glass Rod

Coefficient of Expansion 24.0 to 26.0 x 10-7 (temperature range 50° to 400°C). Other Properties Strain point 615°C Annealing point 690°C Softening point 1150°C Log _ 250 10.7 Log _ 350 9.1 Tk100 435°C

GS30 Graded Seal Glass Rod

Coefficient of Expansion 28.0 to 30.0 x 10-7 (temperature range 50° to 400°C). Other Properties Strain point 550°C Annealing point 640°C Softening point 1075°C Log _ 250 10.7 Log _ 350 9.1 Tk100 435°C

GS44 Graded Seal Glass Rod

Coefficient of Expansion 42.0 to 44.0 x 10-7 (temperature range 50° to 400°C). Other Properties Strain point 510°C Annealing point 550°C Softening point 790°C Log _ 250 9.1 Log _ 350 7.3 Tk100 305°C

B37 Graded Seal Glass Rod

Coefficient of Expansion 36.5 to 38.5 x 10-7 (temperature range 50° to 400°C). Other Properties Strain point 490°C Annealing point 560°C Softening point 770°C Log _ 250 8.7 Log _ 350 7.1 Tk100 290°C Density 2.25 (at 4°C)

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Latest News

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New website for Transition Glass

We have now launched our new website which has a modern look and feel and carries more customer information than ever before.

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Production Doubles

We will be commencing production from new furnaces, if you have any special or new requirements please contact us.

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Semiconductor industry growth expected to double

At Semicon West, SEMI North American President Jonathon Davies said that the semiconductor industry is "begining a multi-year recovery"with grow

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Reliable Industrial Measurement of Core Body Temperature Project Published Glass

Commissioned by British Glass, our members and the IOSH Research Committee, a research project into reliable industrial measurement of core body