152mm Pyrex plane mirror

Product Description

Thick Precision 6-Inch Plane Mirror – 152mm Diameter × 38mm Thick, Protected Aluminum, Lab-Proven

This is an exceptional, lab-surplus plane mirror fabricated from low-expansion Pyrex borosilicate glass. With a substantial 152mm diameter and 38mm thickness, it offers unparalleled rigidity and thermal stability. Featuring a bright, protected aluminum first-surface coating, this mirror is engineered for precision optical testing, laser beam steering, and high-end telescope making.

Key Specifications:

• Diameter: 152 mm (~6 inches)

• Thickness: 38 mm (~1.5 inches – exceptional resistance to distortion)

• Material: Pyrex borosilicate glass (low thermal expansion, high stability)

• Surface Figure: Plano (λ/10 or better) – suitable as a reference flat

• Coating: Protected aluminum first-surface (broadband ~92–95% reflectivity, visible to NIR)

• Clear Aperture: 144 mm conservative usable area (see Condition note)

• Provenance: Marked with inventory codes (1512, 44000, 44312) – indicating controlled lab/defense storage

Condition:

✅ EXCELLENT LAB SURPLUS – Central reflective surface is pristine, with no scratches, digs, or coating defects
📍 NOTE: Contains very minor, superficial handling fuzz near one edge (cosmetic only, from careful lab handling). By using a conservative 144mm clear aperture, this edge area is fully excluded, leaving the mirror optically flawless across the entire working area.

Why This Mirror Is Exceptional:

• Extreme Stability: The 38mm thickness ensures minimal distortion under thermal, gravitational, or mounting stress—far superior to thin commercial mirrors.

• Reference-Grade Flatness: λ/10 or better surface qualifies it as a reliable reference flat for optical testing.

• Traceable Provenance: Inventory codes confirm its history in a controlled research or defense environment, ensuring careful handling and storage.

Applications:

• Optical Testing: Reference flat for Foucault, Ronchi, or interferometric testing of telescope mirrors and other optics.

• Laser Systems: Stable beam-steering or folding mirror for high-power laser setups.

• Telescope Making: Ideal as a large, stable secondary/diagonal mirror for custom Newtonian telescopes.

• Precision Metrology: Critical component in spectrometers, alignment benches, or scientific instruments.

• Vacuum/Viewport Use: Thick design withstands pressure differentials without flexing.