Glossary of Flexible Heater

Etched-foil: A method of producing pre-determined electrical paths,by chemically removing(etching)the areas which will not carry electric current.This process can be used to manufacture heaters,flex-circuits,and temperature sensors.
Mica: A fairly brittle phyllosilicate mineral used to insulate heaters. It is used primarily for its high temperature and high watt density capabilities.
Polyimide: A flexible, amber-colored, translucent film to electrically insulate heaters, flex circuits, and Thermal-Ribbons. It is widely used for its temperature range and resistance to chemicals.
Resistance density: Resistance per unit area. Usually listed as a maximum, it is dependent upon construction materials such as foil, adhensive, and insulation.
Watt density:The amount of power per uint area,often expressed as watts per square inch or watts per square centimerters.
Silicone rubber: A flexible,synthetic elastomer used to electically insulate heaters and Thermal-Ribbons.
Vulcanize: A process,using heat and pressure,used to bond uncured rubber to rubber,metal,ceramic,glass.etc.
Insulation resistance:The actual resistance of an electrically insulating material.Measuring devices typically use high DC voltage to perform the measurement.
AWG(American Wire Gauge):An indicator of wire diameter.The larger the number,the smaller the diameter.
Conduction:The transfer of thermal energy between adjacent bodies(usually solids)or parts of the same body.
Flex circuit:A printed circuit made with flexible materials for compact electrical interconnects.
Resistance tolerance: The range of actual resistance from nominal(or target resistance),at a reference temperature(usually 0).Generally,wire elements have a tighter resistance tolerance than etched foil elements.
Specific heat:The amount of heat per unit mass required to raise the temperature of a material 1.
Watt: The heat produced by one ampere of current through a resistive load of one ohm.