A nickel-iron controlled-expansion alloy containing 48% nickel. Its coefficient of thermal expansion is designed to match that of soft lead and soda-lime glasses. The alloy also has a high inflection point. Used for glass-to-metal seals in radio valves and incandescent electric light bulbs and for industrial thermostats that operate at temperatures up to 840°F (450°C).
Alloy 48 Chemistry maximum % unless noted
|Alloy 48||8.20 g/cm³||1450°C|
Super alloy 48 is suitable for usage in industrial thermostats operating at temperatures up to 450°C (840°F). This alloy is also used for glass-to-metal seals in incandescent electric light bulbs and radio valves.