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Kanthal A1 has a higher maximum operating temperature of 1400°C compared to 1300°C for Kanthal D. It also has a slightly higher tensile strength. Kanthal A1 has high resistivity, better wet corrosion resistance, and higher hot and creep strength. One of the main advantages of Kanthal A1 over Kanthal D is the fact that it does not easily oxidize. It is excellent for making your own coils.
Kanthal A1 Wire, 30 Feet
Ohms/ft
27 GA - 4.15
28 GA - 5.27
29 GA - 6.55
30 GA - 8.36
32 GA - 13.1
34 GA - 21.1
Specifications:
22% chromium (Cr), 5.8% aluminum (Al), Iron (Fe) balance
Density: 7.1 g/cubic cm
Tensile strength: 680 n/mm²
Melting Temperature: 1500°C (2732°F)
Maximum Operating Temperature: 1400°C (2550°F)
Density: 0.256 lbs/cubic in.
Specific heat capacity @ 68°F: 0.11 Btu/lb°F
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Yep it's wire. 
