Custom Sapphire Tubes Semi-Polished Al₂O₃ Single Crystal for Optical Instruments

Sapphire semi-polished tubes are typically manufactured from optical-grade sapphire (α-Al₂O₃ single crystal). They undergo preliminary polishing treatment, resulting in a surface quality that falls between rough-machined blank tubes and fully polished tubes with a mirror finish.

The term "semi-polished" indicates that the tubes have undergone certain polishing processes (which may include rough polishing and preliminary fine polishing), removing most machining marks and achieving good surface smoothness, though not yet meeting the highest surface quality requirements. Depending on specific applications, subsequent custom finishing may be required.

Sapphire Semi-polished Tubes Key Features

The core characteristics of sapphire semi-polished tubes stem from the exceptional properties of sapphire material itself and its semi-polished state:

1. Extreme Hardness & Wear Resistance: Sapphire has a Mohs hardness of 9, second only to diamond. This makes it highly resistant to wear and scratching, suitable for high-abrasion environments.

2. Excellent Optical Properties: Sapphire exhibits good light transmission within the 200 nm to 5500 nm spectrum (covering UV, visible, and near-infrared light), with infrared transmittance remaining stable across temperatures.

3. High Temperature Resistance & Chemical Stability: Sapphire can withstand temperatures up to 1900°C and demonstrates strong corrosion resistance to most acids and alkalis, making it suitable for harsh chemical environments and high-temperature viewports.

4. Specific Advantages of Semi-Polished State:

• Compared to rough blanks: Better surface quality reduces the need for additional processing time and material allowance.
• Compared to fully polished tubes: Generally more cost-effective, providing an economical option for applications not requiring a mirror finish, while retaining allowance for further fine polishing.

Sapphire Semi-polished Tubes Main Applications

Leveraging these properties, sapphire semi-polished tubes are widely used in various high-end fields:

• Semiconductor Industry: Used in high-temperature furnace tubes, viewports, carriers, etc.
• Optical Instruments & Equipment: Serving as infrared/UV windows, optical lens base tubes, laser tubes, etc.
• Industrial Equipment & Sensing: Applied in observation windows under high-temperature and high-pressure conditions (e.g., chemical pumps, reactors), flow meter measurement tubes, sensor protection tubes, etc.
• Research & Special Equipment: Utilized in optical windows for high-pressure research chambers, spectral analysis components, etc.

Sapphire Semi-polished Tubes Key Parameters

The following table summarizes the key technical parameters of sapphire tubes and semi-polished tubes.

Note: The specific parameters of "semi-polished" tubes (especially surface roughness and quality) typically fall between the "General Values" and "High-Precision/Fully Polished" values, depending on processing levels and customer requirements.

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Q1: What is a semi-polished sapphire tube?
A1: A semi-polished sapphire tube is made from optical-grade α-Al₂O₃ single crystal, featuring a surface finish between rough-machined and fully polished states, achieved through preliminary polishing steps to improve smoothness while remaining cost-effective38.

Q2: What are the key advantages of semi-polished sapphire tubes?
A2: They offer high hardness (Mohs 9), excellent optical transmission from UV to NIR (200-5500 nm), and superior chemical/thermal resistance (up to 1900°C), making them ideal for optical instruments, semiconductor equipment, and high-temperature viewports35.

Tags: #​​Sapphire Tubes, #Custom, #High Hardness, #Semi-Polished, #High Hardness, #Infrared Windows​​, #Al₂O₃ Single Crystal, #Optical Instruments