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BYP11 (4J28) Controlled-Expansion Alloy
Overview of BYP11 (4J28) Controlled-Expansion Alloy
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BYP11 (4J28), similar alloy's names in different trademark systems:

Beiye

China Standard

America

Germany

France

Japan

BYP11

4J28

Glass Sealing 28

Sealmet I

ASTM F256

Vacovit 0.25

Dilver 0

FR25

FR28



invar thermal expansion

The Typical Applications of This Alloy are

  • Sealing alloys for soft glasses

  • Anode cap of electron-beam tube

  • Outgoing line of High Power Rectifier Diodes


Typical Chemical Composition in Percent


Ni

27.0~29.0

Fe

bal.



Typical Linear Expansion Coefficient

25℃-530℃

10.8~11.4



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