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Miscellaneous conversion factors
Miscellaneous conversion factors To convert from To Multiply by BTU Kilo-calorie 0.25200 BTU Foot-pound 778.17 BTU Joules 1054.0 BTU Kilowatt-hour 0.00029307 Calorie Joule 4.1840 Centigrade Fahrenheit (1.8 x °C) + 32 Circular mil Square centimeter 0.000005067 Circular mil Square inch
Symbols, formulas and definitions
List of symbols Unit for calculations Symbol Meaning Metric Imperial Ac Surface area of heating conductor cm2 in2 b Width (ribbon or strip) mm in Ct Temperature factor (ratio of resistivity at operating temperature to resistivity at room temperature) d Wire diameter mm
Terminals (resistance and weight data)
Kanthal® A-1 and Kanthal® APM Dimension, mm Resistance, Ω/m Weight, g/m 8 0.0288 357 10 0.0185 558 12 0.0128 803 16 0.0072 1428 20 (Kanthal® APM only) 0.0046 2231 30 (Kanthal® A-1 only) 0.0021 5019 39 (Kanthal® APM only) 0.0012 8922 Kanthal® D Dimension, mm Resistance,
Strip
Content: Kanthal® A-1 Kanthal® AF Kanthal® APM Kanthal® APMT Kanthal® D Nikrothal® 80 Nikrothal® 70 Niktrothal® 60 Nikrothal® 40 Kanthal® A-1 Resistivity 1.45 Ω mm2/m Density 7.1 g/cm3 To obtain resistivity at working temperature, multiply by factor
Ribbon
Content: Kanthal® A, Kanthal® AF and Kanthal® AE Kanthal® D Alkrothal® Nikrothal® 80, Nikrothal® 60 and Nikrothal® 40 Cuprothal® 49 Kanthal® A, Kanthal® AF and Kanthal® AE Ribbon dimensions and properties Resistivity 1.39 Ω mm2/m (836 Ω/cmf).
Wire
Content: Kanthal® A-1 Kanthal® AF Kantal® APM Kanthal® APMT Kanthal® D Nikrothal® 80 Nikrothal® 70 Nikrothal® 60 Nikrothal® 40 Kanthal® A-1 Resistivity 1.45 Ω mm2/m Density 7.10 g /cm3 To obtain resistivity at working temperature, multiply by factor
Product varieties
Rod Wire Strip Ribbon Welded tubes Extruded tubes Straightened wire Kanthal® APM • • • • • Kanthal® A-1 • • • • Kanthal® A • • • Kanthal® D • • • • • Kanthal® DT • • • • • Kanthal® AF • • • • • Kanthal® AE • • • Alkrothal® • • • • • Nikrothal® 80 • •
How to form a strip heating element
Welcome into our element workshop where we meet Stephen Smee and Kanthal material expert, Torbjörn Frankén. Together they walk us through how to form a Kanthal AF strip element, what to think about and what to watch out for. For more “How to” videos, follow our YouTube channel. In short:How electric heating can help foam glass manufacturers reach their full potential
With recycled materials and an environmentally friendly process, the foam glass manufacturing process contributes to a more sustainable world.
Why heating is key to producing high-quality optical fiber cables
Sintering of optical fibers is crucial since the fiber optic cables need to be developed with a specific refractive index to be able to transmit wavelengths.