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Material · Semiconductor Feedstock · NO US BE RU CN JP

Crucible-grade high-purity quartz sand

An unusually pure sand used to line the crucibles that grow silicon crystals. Most of it comes from one place on earth.

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Severity
How this is computedSum of four judged scores, each 0–3: concentration + substitution + lead time + inelasticity.Method →Code →
How hard it binds, 0 to 12
When it bites
Now
judged 2026-09-15
Evidence
6 of 7 verified
7 maker rows

AI & computeEnergySemiconductorsMining & materialsWork on it: roles and trainingReport an error on GitHub

01Key numbers

dated, each linked to its source

Every series on every bottleneck — filter, compare and download.

02Why it holds things up

The clearest single point of failure in the entire chain: inner-layer crucible quartz comes, in practice, from a very small number of deposits, and every Czochralski puller on earth needs it.

Grade that ships · Inner-layer crucible grade, ≤ 20 ppm total impurities.

Part of the process · Materials & tools, which takes years, per qualification to loosen once somebody decides to.

03Severity

judged 2026-09-15 · a judgement, not a measurement

How this is computedSum of four judged scores, each 0–3: concentration + substitution + lead time + inelasticity.Method →Code → / 12

How few suppliers qualify
Estimate, not a measurementOne deposit at Spruce Pine supplies most inner-layer crucible sand; a 2024 hurricane closed it for weeks. Substitutes are synthetic and slow to qualify.By Substrata, open to challenge · 2026-09-15 / 3
How hard to replace
Estimate, not a measurementOne deposit at Spruce Pine supplies most inner-layer crucible sand; a 2024 hurricane closed it for weeks. Substitutes are synthetic and slow to qualify.By Substrata, open to challenge · 2026-09-15 / 3
Decision to new capacity
Estimate, not a measurementOne deposit at Spruce Pine supplies most inner-layer crucible sand; a 2024 hurricane closed it for weeks. Substitutes are synthetic and slow to qualify.By Substrata, open to challenge · 2026-09-15 / 3
Can the buyer walk away
Estimate, not a measurementOne deposit at Spruce Pine supplies most inner-layer crucible sand; a 2024 hurricane closed it for weeks. Substitutes are synthetic and slow to qualify.By Substrata, open to challenge · 2026-09-15 / 3

One deposit at Spruce Pine supplies most inner-layer crucible sand; a 2024 hurricane closed it for weeks. Substitutes are synthetic and slow to qualify.

04Who makes it

6 verified of 7 rows

1 of 1 unsourced rows have pages the sourcing engine found that nobody has checked yet.

OrganisationStepEvidence
The Quartz CorpNo listing foundMine / extractVerified source ↗
SibelcoNo listing foundMine / extractVerified source ↗
Russian QuartzNo listing foundMine / extractVerified source ↗
Jiangsu Pacific Quartz603688 CHRefineVerified source ↗
Momentive TechnologiesNo listing foundConvertVerified source ↗
Shin-Etsu QuartzNo listing foundConvert
4 found, unchecked
Ferrotec6890 JPConvertVerified source ↗

05What it rests on, and what rests on it

each row quotes the page it rests on

Depended on by

  • 300 mm prime silicon wafers
    “Quartz crucibles are a critical component in the manufacture of photovoltaic cells and semiconductor chips. They are used to grow ingots that are then sliced and polished into ultra-thin wafers.”

    thequartzcorp.com · primary source

A recorded dependency is a sentence, not a share, a volume or a contract. Walk it on a portfolio →

06Rules that govern it

No rule has been researched for this one yet.

Policy coverage is being built jurisdiction by jurisdiction.

07What would remove it

  • A fully synthetic crucibleEstimate, not a measurementThis entry originally claimed the synthetic inner layer was the open question. The source says the opposite: fusing synthetic powder onto the inside of a natural-quartz crucible is established practice. So the relief is narrower and earlier than scored — replacing the natural BODY has no demonstrated production route.By Substrata, open to challenge · 2026-09-15Supporting source → · Works as a component in a lab

    Would replace a geological concentration with a factory. Only the thin inner layer is synthetic today; the body of the crucible is still natural sand from a very small number of deposits, and that is the part the bottleneck is actually about.

All science →

08Science pipeline

37 papers, preprints and grants collected, unreviewed
  1. Research37 (Computed: Items per stage = papers, preprints and grants collected for the bottleneck whose relevance score is 2 or more, placed on a stage by the rule in lib/science.ts; judgements are counted separately.)+1 (Computed: Items first collected in the last 7 days whose publication or award date is within the last 30 days.) new
  2. Lab0 (Computed: Items per stage = papers, preprints and grants collected for the bottleneck whose relevance score is 2 or more, placed on a stage by the rule in lib/science.ts; judgements are counted separately.)
  3. Pilot0 (Computed: Items per stage = papers, preprints and grants collected for the bottleneck whose relevance score is 2 or more, placed on a stage by the rule in lib/science.ts; judgements are counted separately.)
  4. Early0 (Computed: Items per stage = papers, preprints and grants collected for the bottleneck whose relevance score is 2 or more, placed on a stage by the rule in lib/science.ts; judgements are counted separately.)
  5. Scale0 (Computed: Items per stage = papers, preprints and grants collected for the bottleneck whose relevance score is 2 or more, placed on a stage by the rule in lib/science.ts; judgements are counted separately.)

judged, with a citation claimed, no citationNumber: papers, preprints and grants the feeds collected — unreviewed

The full pipeline, by stage →

09Who could fund relief

Is funding the constraint? · Money is part of it

Funding could develop a second deposit or a synthetic route, and neither is currently attractive at the price the material commands. The geology is fixed; the willingness to pay for an alternative is not.

A mandate covering the kind of asset that would relieve this row. Not a claim that anyone has funded one, and not advice.

10What has happened

2 dated
  1. 2026-06-30
    NeutralFilingUS NO

    The Quartz Corp restructures its US operations, citing persistent losses in its renewable-energy business.

    WhoThe Quartz Corp

    thequartzcorp.com ↗official source

    The sentence that says so

    “The renewable energy industry, a significant business area for The Quartz Corp (TQC), is affected internationally by persistent losses.”

  2. 2026-06-30
    TightensCapacityUS

    The Quartz Corp indefinitely closes one of its Spruce Pine plants, the most concentrated node in the chain.

    WhoThe Quartz Corp

    thequartzcorp.com ↗official source

    The sentence that says so

    “We are stabilizing our operations including the indefinite closure of one quartz production facility located at Altapass Highway in Spruce Pine, NC, U.S. and reducing our workforce by 20-30 people as a result.”

All events →

11What this holds up

2 loops
  • Siliconone turn: Months

    Worst judgement on this loop: How this is computedThe highest severity score among the bottlenecks recorded as gates on the loop.Method →Code →, judged 2026-09-15

  • Materials qualificationone turn: Years

    Worst judgement on this loop: How this is computedThe highest severity score among the bottlenecks recorded as gates on the loop.Method →Code →, judged 2026-09-15

A loop is one design, build and measure turn. Severity is a dated judgement on a 0–12 scale, not a measurement, and the judgements are not added together — the figure shown is the worst single one.

Discussion

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