Karma Foil, Strain Foil, Constantan Foil, Nickel Foil, 6um,

Product Details
Customization: Available
Application: Aviation, Electronics
Standard: GB, DIN, ASTM, AISI

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  • Karma Foil, Strain Foil, Constantan Foil, Nickel Foil, 6um,
  • Karma Foil, Strain Foil, Constantan Foil, Nickel Foil, 6um,
  • Karma Foil, Strain Foil, Constantan Foil, Nickel Foil, 6um,
  • Karma Foil, Strain Foil, Constantan Foil, Nickel Foil, 6um,
  • Karma Foil, Strain Foil, Constantan Foil, Nickel Foil, 6um,
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Basic Info.

Model NO.
karma
Purity
80%
Alloy
Alloy
Type
Nickel Strip
Powder
Not Powder
Chemical Composition
Ni 80%
Product Name
Karma Foil
Characteristics
High Resistivity, Good Oxidation Resistance
The Highest Use Temperature
1300c
Density
8.1g/cm3
Resisivity
1.33
Transport Package
Wooden Cases or Cartons
Specification
0.003mm
Trademark
HUONA
Origin
Shanghai
HS Code
7505220000
Production Capacity
50 Ton/Month

Product Description

0.003mm Karma foil, strain foil, Constantan foil, Nickel foil, 3um

1.   Karma alloy

Karma 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 size

Wire: 0.01mm-10mm
Ribbon: 0.05*0.2mm-2.0*6.0mm
Strip: 0.5*5.0mm-5.0*250mm
 

3.Karma  Property

  name  code

                         Main Composition (%)

 

Standard

 

Cr Al Fe Ni
 Karma  6J22  

19~21

 

2.5~3.2

 

2.0~3.0

 bal.  

JB/T 5328

 

Name Code

 (20ºC) 
Resisti

  vity
(μΩ.m)

  (20ºC) 
Temp. Coeff. 

Of Resistance
 (αX10-6/ºC)

(0~100ºC) 
Thermal 

 EMF vs. 

 Copper
 (μv/ºC)

Max.workin

       g
Temp.(ºC)

(%)
Elongati

    on

(N/mm2)
 Tensile 
Strength
Standard
Karma 6J22 1.33±0.07 ≤±20 ≤2.5 ≤300 >7 ≥780 JB/T 5328

4. Distinctive features of Karma resistance wire

1) Starting with Nickel Chromium electric heat wire Class 1, we replaced some of the Ni with
Al and other elements, and thus achieved a precision resistance material with improved
resistance temperature coefficient and heat electromotive force against copper.
With the addition of Al, we have succeeded in making volume resistivity 1.2 times greater
than 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 wide
temperature range.

Therefore, the temperature coefficient is set to be the average temperature coefficient between
23 ~ 53 °C, but 1 × 10-6/K, the average temperature coefficient between 0 ~ 100 °C, also may
be adopted for the temperature coefficient.

3) Electromotive force against copper between 1 ~ 100 °C is also small, below + 2 μV/K, and

exhibits excellent stability over a period of many years.

4) If this is to be used as a precision resistance material, low temperature heat treatment is
required to eliminate processing distortions just as in the case of Manganin wire CMW.

Karma Foil, Strain Foil, Constantan Foil, Nickel Foil, 6um,
 

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