Leading the Way in Advanced Materials Solutions

Adhesiveless Lamination Technology (ALT)

Fralock is the manufacturer of a highly durable and rugged all-polyimide material constructed with our proprietary Adhesiveless Lamination Technology (ALT). We use this technology to bond layers of polyimide to produce a monolithic material that is able to operate in extreme environmental conditions for extended time without cracking or delaminating. ALT material is ideal for critical applications in industries such as aerospace, military defense, medical, industrial, and energy.

Adhesiveless Lamination Technology
Dupont Flex Rigid Circuit
ALT Dura Flex Circuits
Dupont Cirlex Solutions

ALT Dura™ products are components made using ALT, providing custom solutions for our customers in a wide range of applications. These products include two types of components: flexible interconnect circuits and heaters, and structural components made with DuPont™ Cirlex®.

Flexible Interconnect Products – ALT Dura™ Flex Circuits are fully encapsulated with polyimide, protecting the traces from environmental disturbances and degradation. The flex circuits, harnesses and heaters can withstand delamination in demanding conditions such as hard creasing and repetitive flex cycles. Additionally, ALT Dura™ products offer superior resistance to trace swimming under high temperatures and 30% reduction in mass compared with traditional flex products laminated with temperature-limiting adhesives. ALT Dura™ circuits also exhibit a wide temperature operational tolerance, from -269° to 220° C (-452° to 428° F).

DuPont™ Cirlex® is a rugged thick polyimide that is suitable for a variety of applications requiring chemical, physical, and thermal stability in extreme environments. Alt Dura™ products made with Cirlex® are highly machinable and used for thermal and electrical insulation, and as a stiffening material in other components. Cirlex® is operational from -452°F to 664°F (-269°C to 351°C), is UL® 94VO rated, and is resistant to radiation and most organic chemicals, solvents, fuels, and lubricants.

ALT Dura™ Cirlex® Products include:

  • Encapsulated shims
  • Gaskets and Seals
  • Electrical Insulators
  • Standoffs and Spacers
  • Electrostatic Chucks
  • Component Stiffeners
  • Thermal Barriers
  • Sealing Shims
  • Lid Rings
  • Washers with Adhesive
  • Thermal Shields


Fralock partners with you to design, engineer, fabricate, test, and manufacture custom ALT Dura™ products to satisfy your demanding requirements.

Custom ALT Dura™ Products