Custom Sapphire Ring Washer – Wear-Resistant, Insulating Single-Crystal Al₂O₃ Component

Product Overview

Sapphire Ring Washers are precision components fabricated from optical-grade single-crystal Al₂O₃. With a Mohs hardness of 9, excellent chemical stability, and an exceptionally wide transmission spectrum, sapphire ring washers are ideal for extreme environments requiring high durability, insulation, transparency, and dimensional accuracy.

These washers are commonly used in semiconductor equipment, vacuum systems, medical devices, optical instruments, and high-temperature or chemically aggressive environments. Customized dimensions and specifications are available according to your design drawings.

Key Features

• Ultra-High Hardness

Mohs hardness of 9 (second only to diamond), offering exceptional scratch resistance and long service life.

• Chemical Inertness

Outstanding corrosion resistance to acids, alkalis, and solvents (except HF). Suitable for harsh chemical environments.

• Wide Optical Transmission

High transmittance between 0.3 μm (UV) and 5 μm (IR); 80–90% transmission across the visible spectrum (400–700 nm).

• High Temperature Resistance

Melting point of 2030°C, operational stability up to 1800°C short-term. Suitable for high-temperature sealing and insulation.

• Excellent Electrical Insulation

Resistivity greater than 10¹⁴ Ω·cm. Sapphire’s inertness makes it an ideal electrical and thermal insulator.

• High Mechanical Strength

Sapphire exhibits outstanding compressive strength and low friction after polishing (Ra < 0.01 μm), enabling use in precision mechanical systems.

• Customizable Dimensions

Large outer and inner diameters can be produced for special applications. Fully customizable according to customer drawings.

Technical Specifications

Applications

• Semiconductor Equipment

Insulating and wear-resistant sealing parts for wafer processing, epitaxy, CVD, and etching tools.

• Vacuum & High-Temperature Systems

Used as sealing washers and insulating spacers in high-vacuum and ultra-high-vacuum environments.

• Medical Devices

Corrosion-resistant structural components for surgical instruments and implantable devices.

• Optical & Laser Instruments

Precision spacers, cavity isolators, optical mounts, and transparent insulating washers.

• Extreme Environments

Sapphire’s hardness, melting point, and inertness make it suitable for:
– high-pressure systems
– acidic/alkaline environments
– high-temperature detection windows
– explosion-proof observation ports
– underwater cameras and flame detectors

Manufacturing Capability

We provide high-precision sapphire ring washers and fully customized sapphire components for research and industrial applications. Our advanced polishing, shaping, and inspection processes ensure:

• Consistently repeatable precision

• Defect-free, high-quality surfaces

• Tight dimensional tolerances

• Bubble-free and low-stress crystal structure

We focus exclusively on custom sapphire optical and mechanical components. While we do not maintain large inventories, sample pieces can be provided for testing if similar dimensions are available.

FAQ

Q1: Why choose sapphire washers instead of metal or ceramic washers?

A: Sapphire offers unmatched hardness (Mohs 9), high-temperature resistance up to 1800°C, excellent chemical inertness, superior wear resistance, and exceptional dimensional stability.

Q2: Which industries use sapphire ring washers?

A: Semiconductor manufacturing, vacuum systems, optical instruments, aerospace, medical devices, and environments with high pressure, high temperature, or heavy corrosion.

Q3: Can sapphire ring washers be fully customized?

A: Yes. Simply send us your drawing or specifications. We support rapid prototyping and precision customization.

Q4: Do you offer sample pieces?

A: If similar items exist in our sample inventory, we can provide them for performance testing at a small fee.

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