ENGLISH OVERVIEW

ABF Build-up Film

Prepared by IndustryAtlas Editorial principles & corrections

An insulating material used to build package substrates

Ajinomoto Build-up Film is an insulating film developed by Ajinomoto for package substrates. Substrate makers laminate and cure the film, create microvias and copper circuits, and repeat the build-up where needed. The film is neither a finished substrate nor a chip.

Sources reviewed: 2026-09-27

Separate film suppliers from substrate makers

Ajinomoto supplies ABF film; companies such as Unimicron process materials into substrates. Formulation, dispersion, film uniformity and defect control influence later lamination and circuit formation.

A change in film grade requires the substrate maker to confirm its processing window.

Connect the layers correctly

Glass-reinforced cores and ABF build-up can coexist in one substrate. System-board CCL and prepreg are adjacent but different material roles.

CoWoS growth does not directly determine ABF consumption: substrate area, build-up count, architecture and yield also intervene. Material release, trial production and end-product adoption are separate stages.

Connected industry roles

Links describe supply, classification, technology or services. They do not establish transactions between individual companies.

ABF Build-up Film → ABF Package Substrates

Build-up insulation

Substrate makers process film into multilayer interconnects; a material-to-finished-product relationship.

Ajinomoto | ABF build-up dielectric materials

Sources reviewed: 2026-09-27

ABF Build-up Film → Glass Build-Up Layers and RDL Wiring

Optional: ABF build-up insulation

Intel's public patent includes ABF on both sides of a glass core, showing coexistence is possible; it is not evidence of a particular mass-produced product or an Ajinomoto customer order.

Intel published patent US20260005081A1 | Glass-core and ABF coexistence architecture

Sources reviewed: 2026-09-30

Company examples & product roles

This topic lists ABF film manufacturers; substrate makers appear in the downstream ABF package-substrate topic.

Ajinomoto ↗

Japan · Example role

ABF build-up insulating film developer

Develops and supplies Ajinomoto Build-up Film; downstream substrate manufacturing is listed under ABF package substrates.

Official product / role source

Sources

This English overview condenses the original guide. Product specifications and certifications should be checked against the linked manufacturer documentation.