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Custom 140mm Double-Side Polished Sapphire Tubes Optical Component Protection Tubes

Sapphire thermocouple protection tube
September 03, 2025
Category Connection: Sapphire Parts
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The "140mm double-side polished sapphire tube" refers to a tubular component approximately 140mm in length, manufactured from optical-grade sapphire (α-Al₂O₃ single crystal), with both its inner and outer walls polished.

Sapphire crystal is a critical material due to its high hardness (Mohs hardness 9, second only to diamond), excellent wear resistance, high-temperature stability (melting point ~2030-2050°C), good chemical inertness, and broad-band transmittance from UV to IR (approximately 200nm to 5500nm). "Double-side polishing" means both the inner and outer surfaces have undergone precision processing to achieve specific surface smoothness and roughness requirements, meeting the demands of high-end applications for low loss, high reliability, and precision.
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#sapphire tube #sapphire bearings #sapphire windows
Brief: Discover the Custom 140mm Double-Side Polished Sapphire Tubes, designed for high-end optical component protection. These tubes feature extreme hardness, excellent optical properties, and exceptional high-temperature resistance, making them ideal for semiconductor, optical, and industrial applications.
Related Product Features:
  • Extreme hardness with Mohs hardness up to Level 9, ensuring high wear resistance.
  • Excellent optical properties with broad-band transmittance from UV to IR (200nm to 5500nm).
  • Exceptional high-temperature resistance, withstanding up to 1900°C or higher.
  • Good chemical stability, resistant to most acids and alkalis.
  • Low surface roughness (Ra ≤ 0.1μm) on both inner and outer walls for minimal light scattering.
  • High surface finish with minimal defects, meeting MIL-O-13810 60/40 or better standards.
  • Precision polishing ensures good geometric accuracy, including concentricity and straightness.
  • Customizable dimensions and specifications to meet specific application requirements.
Faqs:
  • What are the key advantages of 140mm double-side polished sapphire tubes?
    They offer exceptional optical clarity (200-5500nm wavelength range), extreme surface hardness (Mohs 9), high temperature resistance (up to 1900°C), and superior chemical stability, making them ideal for demanding applications in semiconductor, optical, and high-precision industrial equipment.
  • What are the typical surface specifications achieved for 140mm double-side polished sapphire tubes?
    They typically achieve a surface roughness of ≤0.1μm (Ra) or better and a surface quality grade of 60/40 or superior per MIL-O-13810 standards, ensuring minimal light scattering and high dimensional accuracy for precision components.
  • What industries commonly use these sapphire tubes?
    These tubes are used in the semiconductor industry, optical instruments, industrial equipment, and research applications, where high purity, high-temperature resistance, and precision optical performance are required.
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