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C Grade Nichrome is consistently silvery in colour, is corrosion-resistant, has a high melting point of about 1,400 °C (2,550 °F), and has an electrical resistivity of around 1.12 μΩ·m, which is around 66 times higher resistivity than copper of 16.78 nΩ·m. [3]
Melting point: 1420 °C ... It is also commonly called Nichrome 60 and is used for heating elements, resistance windings, and hot wire cutters. Chromel-R
Nichrome, a non-magnetic 80/20 alloy of nickel and chromium, is the most common resistance wire for heating purposes because it has a high resistivity and resistance to oxidation at high temperatures, up to 1,400 °C (2,550 °F). When used as a heating element, resistance wire is usually wound into coils.
Foam glass or expanded glass is a porous glass foam material. It is used as a light weight, moisture- and fireproof building material with thermal and acoustic insulating properties. It is made by heating a mixture of crushed or granulated glass and a blowing agent (chemical foaming agent ), often carbon or carbonates such as limestone .
The resistance per wire length (Ω/m) of a heating element material is defined in ASTM and DIN standards. [ 2 ] : 2 [ 3 ] [ 4 ] In ASTM, wires greater than 0.127 mm in diameter are specified to be held within a tolerance of ±5% Ω/m and for thinner wires ±8% Ω/m.
The Gmelin rare earths handbook lists 1522 °C and 1550 °C as two melting points given in the literature, the most recent reference [Handbook on the chemistry and physics of rare earths, vol.12 (1989)] is given with 1529 °C.
Ordinary Kanthal FeCrAl alloy has a melting point of 1,425 °C (2,597 °F). Special grades can be used as high as 1,500 °C (2,730 °F). [2] Depending on specific composition the resistivity is about 1.4 μΩ·m and temperature coefficient is +49 ppm/K (+49 × 10 −6 K −1).
For example, the melting point of silicon at ambient pressure (0.1 MPa) is 1415 °C, but at pressures in excess of 10 GPa it decreases to 1000 °C. [13] Melting points are often used to characterize organic and inorganic compounds and to ascertain their purity. The melting point of a pure substance is always higher and has a smaller range than ...