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Flexible Circuits

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Flex Circuit Materials, Layers & Plated Through Vias

Conductor Materials

Copper is the most commonly used material for circuit traces and offers the most cost effective solution. Thickness typically ranges from .0007" to .0028". Tech-Etch works with both adhesive based and adhesiveless substrate materials. Our Flex Circuit Construction page explains these processes in more detail. Tech-Etch also has the capability to manufacture circuits from specialty metals to support specific applications. Some examples are stainless steel for corrosion resistance, BeCu for spring properties, Cupronickel for high resistance applications, and selective tungsten segments when radiopacity is desired.

Insulator Materials

Polyimide film is the most common insulator material used for flex circuits. Tech-Etch uses this film as the base layer on single metal layer flex circuits and for inner layers of multilayer circuits.

Plated Through Vias

Tech-Etch can provide circuits with plated through vias. A via is a metalized through hole that connects the conductive layers of a flexible circuit.

Tech-Etch can also produce blind vias where the via connects an outer layer with the adjacent inner layer, but does not go all the way through the circuit. Buried vias connect internal layers, but also do not connect to the outer layers. These advanced via types can help increase space within the circuit for other features such as component pads or additional trace routing.

Tech-Etch has the ability to drill vias as small as .001" diameter using laser drill technology. Visit the flex circuit Tolerance page for via size limitations.
Plated Through Vias

Flex Circuit Layers


Single Layer flex Circuit



Double Layer Flex Circuit



Four Layer Flex Circuit

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