Flame Retardant Polyimide

General Information

Arlon’s 35N is a 250⁰C high glass transition temperature polyimide resin system ideal for demanding applications that require low Z-axis directional expansion and resistance to PTH failures during operation in harsh environmental conditions. 35N has reduced temperature and cure times which offers improved throughput during manufacturing compared to traditional polyimide cycles. Applications for 35N include military, aerospace, down hole oil and gas drilling, commercial and industrial electronics. Meets requirements of IPC-4101/40 and IPC-4101/41.

Detailed Specs

Process inner-layers through develop, etch, and strip using standard industry practices. Use brown oxide on inner layers. Adjust dwell time in the oxide bath to ensure uniform coating. Bake inner layers in a rack for 60 minutes at 107°C - 121°C (225°F - 250°F) immediately prior to lay-up. Store prepreg at 60-70°F at or below 30% RH. Vacuum desiccate the prepreg for 8 - 12 hours prior to lamination.

Lamination Cycle:

  1. Pre-vacuum for 30 - 45 minutes
  2. Control the heat rise to 4.5°C - 6.5°C (8°F - 12°F) per minute between 100°C and150°C (210°F and 300°F). Vacuum lamination is preferred. Start point vacuum lamination pressures are shown in the table below.
  3. Set cure temperature at 213˚C (415˚F). Start cure time when product temperature > 210˚ C (410˚F)
  4. Cure time at temperature = 90 minutes
    NOTE: For sequential lamination use 60 minutes for the first lamination and 90 minutes for the final.
  • Drill at 350 SFM. Undercut bits are recommended for vias 0.0 18” (0.45mm) and smaller
  • De-smear using alkaline permanganate or plasma with settings appropriate for polyimide; plasma is preferred for positive etchback
  • Conventional plating processes are compatible with 35N
  • Standard profiling parameters may be used; chip breaker style router bits are not recommended
  • Bake for 1 - 2 hours at 250°F (121°C) prior to solder to reflow of HASL

SDS -35N Prepreg-US


Arlon EMD is the first U.S. laminator recognized under IPC’s Quality Product Listing. We are the only laminator to have achieved certification for all three slash sheets on polyimide materials, IPC-4101/40, IPC-4101/41 and IPC-4101/42.

IPC-4101 Tested Products Validation

IPC-4101 Qualifed Products Listing

Need more information...