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FR-4

fiberglass reinforced epoxy laminate that is Flame Retardant (self extinguishing)
Thing general Q2466079
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FR-4

Summary

FR-4 ranks in the top 2% of general entities by monthly Wikipedia readership (206 views/month).[1]

Key Facts

  • FR-4's made from material is recorded as epoxy resins[2].
  • FR-4's made from material is recorded as glass fiber[3].
  • FR-4's subclass of is recorded as composite material[4].
  • FR-4's Freebase ID is recorded as /m/02yzrz[5].
  • FR-4's Microsoft Academic ID is recorded as 2778789668[6].

Why It Matters

FR-4 ranks in the top 2% of general entities by monthly Wikipedia readership (206 views/month).[1] FR-4 has Wikipedia articles in 10 language editions, a strong signal of global cultural recognition.[7] FR-4 is known by 4 alternative names across languages and contexts.[8]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . Freebase Data Dumps. wikidata.org.
  5. [6] ↑ . wikidata.org.

Aggregate / graph-position facts

  1. [1] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [7] ↑ . Wikidata sitelinks. wikidata.org.
  3. [8] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). FR-4. Retrieved April 10, 2026, from https://4ort.xyz/entity/fr-4
MLA “FR-4.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Apr. 2026, https://4ort.xyz/entity/fr-4.
BibTeX @misc{4ortxyz_fr-4_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{FR-4}}, year = {2026}, url = {https://4ort.xyz/entity/fr-4}, note = {Accessed: 2026-04-10}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): FR-4 — https://4ort.xyz/entity/fr-4 (retrieved 2026-04-10)

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