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5um Etching Resistance Karma Foil/Evanohm Foil/Constantan Foil/Nickel Foil1
Non-ferrous Metal ProductsKarma FoilEvanohm Foil
Huona (Shanghai) New Material Co., Ltd.
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Product Description Ultra-thin 5um Karma Foil/Evanohm Foil/Constantan Foil/Nickel Foil for Etching resistance1. Karma alloyKarma alloy is made up of copper, nickel, Aluminum and Iron as the main components. The resistivity is 2~3 times higher than MENTONG. It has lower temperature coefficient of resistance(TCR), lower thermal EMF versus copper, good permanence of resistance for a long period of time and strong anti-oxidation. Its working temperature range is wider than MENTONG (-60~300oC). It is suitable for making fine precision resistance elements and strain. 2. Karma sizeWire: 0.01mm-10mmRibbon: 0.05*0.2mm-2.0*6.0mmStrip: 0.5*5.0mm-5.0*250mmFoil: 0.005*100mm-0.03*100mm3.Karma Property name code Main Composition (%) Standard CrAlFeNi Karma 6J22 19~21 2.5~3.2 2.0~3.0 bal. JB/T 5328 NameCode (20oC) Resisti vity(μΩ.m) (20oC) Temp. Coeff. Of Resistance (αX10-6/oC)(0~100oC) Thermal EMF vs. Copper (μv/oC)Max.workin gTemp.(oC)(%)Elongati on(N/mm2) Tensile StrengthStandardKarma6J221.33±0.07≤±20≤2.5≤300>7≥780JB/T 53284. Distinctive features of Karma resistance wire1) Starting with Nickel Chromium electric heat wire Class 1, we replaced some of the Ni withAl and other elements, and thus achieved a precision resistance material with improvedresistance temperature coefficient and heat electromotive force against copper.With the addition of Al, we have succeeded in making volume resistivity 1.2 times greaterthan Nickel Chromium electric heat wire Class 1 and the tensile strength 1.3 times greater.2) The secondary temperature coefficient β of Karmalloy wire KMW is very small, - 0.03 × 10-6/ K2,and the resistance temperature curve turns out to be almost a straight line within a widetemperature range.Therefore, the temperature coefficient is set to be the average temperature coefficient between23 ~ 53 °C, but 1 × 10-6/K, the average temperature coefficient between 0 ~ 100 °C, also maybe adopted for the temperature coefficient.3) Electromotive force against copper between 1 ~ 100 °C is also small, below + 2 μV/K, andexhibits excellent stability over a period of many years.4) If this is to be used as a precision resistance material, low temperature heat treatment isrequired to eliminate processing distortions just as in the case of Manganin wire CMW.
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