No. Nothing perfectly insulates a magnetic field.
Invar can be used as magnetic core material, but there are better choices. Invar is alloyed for its thermal stability. It is iron with a good percentage of nickel. Remember that magnetic core material is usually laminated or is "powdered" in a way to electrically isolate the "bits" of core material so eddy currents will be reduced. A link is posted to the article on Invar put up by our friends at Wikipedia, where knowledge is free.
There are invar missiles.
The heaviest alloy known to exhibit magnetic properties is typically found in certain ferromagnetic alloys, such as those containing iron, nickel, and cobalt. Among these, alloys like iron-nickel (Invar) and cobalt-based alloys can be quite dense and retain magnetic characteristics. Invar, for example, has a density of about 8.0 g/cm³ and is known for its low thermal expansion and magnetic properties. However, there are also various heavy rare earth alloys that can be magnetic, but their specific applications and compositions can vary widely.
Because Invar steel expands and contracts very little with changes in temperature.
Invar
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No, Invar is not electrically conductive as it is a nickel-iron alloy with a low coefficient of thermal expansion. This makes it useful in applications where dimensional stability is crucial, such as in precision instruments.
The alloy Invar is made up by the metals of nickel and iron. The full makeup is 36% nickel and 64% iron. The alloy was invented in the year 1896 by a Swiss scientist.
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Invar steel is used in applications that require low thermal expansion, such as precision instruments, clocks, and scientific devices. Its low coefficient of thermal expansion helps it maintain dimensional stability over a wide range of temperatures.
It's inbhear in Irish but inbhir in Scottish and means 'river-mouth'.
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