{
 "id": "1.14",
 "slug": "substrate-materials",
 "url": "/parts/compute-silicon-and-packaging/substrate-materials",
 "name": "Substrate materials",
 "qualifiers": null,
 "layer": {
  "id": 1,
  "name": "Compute silicon & packaging"
 },
 "parent_id": null,
 "children": [],
 "summary": "The films, resins, glass cloth, and other specialty chemicals that go into building an ABF package substrate.",
 "description_md": "These are the raw material inputs to substrate manufacturing (ABF / high-layer package substrates): the resin film, glass cloth, and specialty resins that get layered and cured into a finished substrate. It's a step further upstream than the substrate makers themselves, and the taxonomy notes that at least one input — the ABF film itself — is effectively sole-sourced from a single supplier, which makes this one of the tightest single-point dependencies in the entire compute-silicon chain, upstream of every AI accelerator package that uses it.\nFor investors, a sole-source or near-sole-source material position is about as concentrated as supply chain exposure gets: it means substrate output, and by extension advanced packaging output, and by extension finished accelerator supply, can be gated by a single material producer's capacity decisions. That's a structural point the taxonomy makes explicitly rather than a market-share estimate, and it's worth treating as a genuine chain constraint rather than a hedge-able diversification risk, since there is reportedly no readily qualified alternative supplier at scale.",
 "ai_delta": "Rising AI substrate volume and larger, higher-layer-count substrate designs pull directly on the limited capacity of the specialty films, resins, and cloth that go into them.",
 "bottleneck_status": null,
 "scale_tiers": [
  "enterprise",
  "hyperscale_building",
  "ai_campus",
  "gw_class"
 ],
 "density_modes": [
  "any"
 ],
 "scale_notes": "Material volume tracks substrate production industry-wide; a single input can gate an entire generation's packaging output regardless of which facility tier the finished accelerators end up in.",
 "flow": [
  "compute"
 ],
 "companies": [
  {
   "company_id": "ajinomoto",
   "name": "Ajinomoto",
   "role": "manufacturer",
   "confidence": "inferred",
   "ownership_type": "public",
   "ticker": "2802.T",
   "product_note": "ABF film (effectively sole source)",
   "note": null,
   "source_url": null
  },
  {
   "company_id": "asahi-kasei",
   "name": "Asahi Kasei",
   "role": "manufacturer",
   "confidence": "inferred",
   "ownership_type": "public",
   "ticker": "3407.T",
   "product_note": null,
   "note": null,
   "source_url": null
  },
  {
   "company_id": "mitsubishi-gas-chemical",
   "name": "Mitsubishi Gas Chemical",
   "role": "manufacturer",
   "confidence": "inferred",
   "ownership_type": "public",
   "ticker": "4182.T",
   "product_note": "BT resin",
   "note": null,
   "source_url": null
  },
  {
   "company_id": "nittobo",
   "name": "Nittobo",
   "role": "manufacturer",
   "confidence": "inferred",
   "ownership_type": "public",
   "ticker": "3110.T",
   "product_note": null,
   "note": "low-Dk T-glass cloth",
   "source_url": null
  },
  {
   "company_id": "sumitomo-bakelite",
   "name": "Sumitomo Bakelite",
   "role": "manufacturer",
   "confidence": "inferred",
   "ownership_type": "public",
   "ticker": "4203.T",
   "product_note": null,
   "note": null,
   "source_url": null
  }
 ]
}