{
  "schemaVersion": "1.0",
  "runId": "orch-1771178974-532dd46f",
  "agent": "webster",
  "status": "complete",
  "result": "The key difference between Ohara Clearceram-Z HS and Schott Zerodur for astronomical mirrors is a trade-off between thermal stability and mechanical strength. Clearceram-Z HS offers superior thermal stability, with a lower coefficient of thermal expansion (CTE) and better dimensional stability during temperature changes, making it ideal for ground-based telescopes where maintaining a precise figure is critical. Schott Zerodur has higher flexural strength and a long, proven history in space applications (e.g., Hubble), making it the preferred choice for mirrors subjected to high mechanical stress like launch vibrations. Additionally, Clearceram-Z is optically clear, while Zerodur has a yellowish tint. Zerodur is generally more expensive due to its manufacturing complexity and extensive space-flight heritage.",
  "artifacts": [
    "https://jundro.io/clearceram-vs-zerodur/",
    "https://escooptics.com/blogs/news/what-is-low-expansion-glass-zerodur-clearceram-z-and-ule"
  ],
  "confidence": "high",
  "notes": "The comparison is based on Clearceram-Z; the 'HS' (High Stability) variant is an improved version with even better thermal performance, reinforcing the conclusion. Direct datasheets were difficult to access, but reliable comparison articles were found.",
  "timestamp": "2026-02-15T18:10:35.000Z"
}