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Constantan
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==A-alloy== Very importantly, constantan can be processed for self-temperature compensation to match a wide range of test material [[coefficient of thermal expansion|coefficients of thermal expansion]]. A-alloy is supplied in self-temperature-compensation (S-T-C) numbers 00, 03, 05, 06, 09, 13, 15, 18, 30, 40, and 50, for use on test materials with corresponding thermal expansion coefficients, expressed in parts per million by length (or ΞΌm/m) per degrees Fahrenheit.
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