Editing Mica (section)

==== Electrical and electronic ====
[[File:Silver mica capacitors.jpg|thumb|[[Silver mica capacitor]]s]]
Sheet mica is used principally in the electronic and electrical industries. Its usefulness in these applications is derived from its unique electrical and thermal properties and its mechanical properties, which allow it to be cut, punched, stamped, and machined to close tolerances. Specifically, mica is unusual in that it is a good electrical insulator at the same time as being a good thermal conductor. The leading use of block mica is as an electrical insulator in electronic equipment. High-quality block mica is processed to line the gauge glasses of high-pressure steam boilers because of its flexibility, transparency, and resistance to heat and chemical attack. Only high-quality muscovite film mica, which is variously called India ruby mica or ruby muscovite mica, is used as a dielectric in [[capacitor]]s. The highest quality mica film is used to manufacture capacitors for [[calibration standard]]s. The next lower grade is used in [[transmitting capacitor]]s. Receiving capacitors use a slightly lower grade of high-quality muscovite.<ref name=usgs/>

Mica sheets<!--Mica heating boards? --> are used to provide structure for heating wire (such as in [[Kanthal (alloy)|Kanthal]] or [[Nichrome]]) in [[heating element]]s and can withstand up to {{convert|900|°C|°F|abbr=on}}.

Single-ended self-starting lamps are insulated with a mica disc and contained in a [[borosilicate glass]] gas discharge tube (arc tube) and a metal cap.<ref name="lamptech">{{Cite web|url=http://www.lamptech.co.uk/Documents/SO%20History%20MV-SE.htm|title=The Low Pressure Sodium Lamp}}</ref> They include the [[sodium-vapor lamp]] that is the [[gas-discharge lamp]] in street lighting.<ref name="lamptech" /><ref>{{Cite web|url=https://www.stouchlighting.com/blog/led-vs-hps-lps-high-and-low-pressure-sodium|title=Lighting Comparison: LED vs High Pressure Sodium/Low Pressure Sodium|website=www.stouchlighting.com}}</ref><ref>{{Cite web|url=https://edisontechcenter.org/SodiumLamps.html|title=The Sodium Lamp – How it works and history|website=edisontechcenter.org}}</ref>