Flex & Rigid-Flex Circuit Capabilities

Below are our flex and rigid flex circuit capabilities, along with available materials substrates and adhesives. We also offer an extensive range of solder mask and coverlay products as well as various surface and finishes treatments.

Flexible Circuit Board Capabilities

Our Capabilities Include

  • Single or Double Sided Flex: Polyimide
  • Multilayer Flex up to 8 layers
  • Multilayer Rigid-Flex up to 20+ layers (rigid area)
  • Lines and Spaces: down to 0.003"
  • Installation of Connectors, Pins, Contacts, etc.
  • SMD & PTH Component Assembly available
  • Stiffener Supported Areas (using FR-4, Polyimide, etc.)
  • Blind & Buried Vias
  • Controlled Impedance
  • Selective Adhesives, PSAs and Thermally bonded
  • EMI / RF Shielding: Copper, Silver Ink & Shielding films
  • Circuits up to 24" in Length or Greater Depending Upon Technology

Flexible Circuit Materials


  • Polyimide: 1 – 3 mil
  • Epoxy
  • Teflon
Flexible Circuit Board Materials


  • Rolled Annealed Copper
  • Electro - Deposited

Flex Circuit Adhesives

  • Modified Acrylic
  • Modified Epoxy
  • Pressure Sensitive (PSA)

Solder Mask / Coverlay

A coverlay serves as the same function as soldermask that is used on a rigid printed circuit board. The difference with a coverlay is the added element of flexibility and durability it provides to the flexible circuit board.

  • Polyimide Coverlay: 1/2 mil to 2 mil
  • Flexible Liquid Photoimagable (LPI) Soldermask

Surface Treatment & Finishes

  • ENIG (Electroless Nickel - Immersion Gold)
  • Immersion Silver
  • Hard Gold
  • HAL (Non-leaded, RoHS)
  • HAL (Leaded)


Stiffeners are typically used to reinforce selective areas of flexible circuitry for component support, durability and mounting. They can also be used for strain relief and heat dissipation. Bonding materials include pressure sensitive adhesive (PSA) and Temperature sensitive adhesive (TSA).

Stiffener Materials:

  • Unclad FR4 / G10
  • Polyimide

Stiffener thickness is determined by your actual needs. Typical stiffeners thickness' range from 0.005" to 0.062".

America's Oldest, A History of Innovation.  Learn More →
Our History

As the oldest production Printed Circuit Board Company in North America, perhaps in the world, the 60-year plus story of Epec is connected to the development of the PCB and the electronics industry.

See our history timeline →

  • Epec Founded in 1952
  • IPC Founded in 1957
  • Epec Builds PCB for Apollo 11