Sapphire Tube

Sapphire Tube Properties

Specification note: Confirm Al2O3 sapphire material, CAS 1344-28-1 reference, OD, ID, length, wall thickness, orientation, polish level, surface quality, edge treatment, coating and quantity.

Sapphire Tube Specifications

Sapphire Infrared Transmittance at Different Thicknesses

Sapphire Tube Key Features

• High Temperature and Pressure Resistance: Withstands extreme thermal and pressure conditions, making it suitable for thermocouple protection in environments such as heavy-oil reactors and hydrogen production systems.
• Optical Compatibility: Offers excellent transmission from UV to mid-IR, enabling use in curved optical components, bent fiber guides, and high-precision applications in Micro-LED and OLED technologies.
• Electrical and Electronic Performance: Provides high hardness and strong electrical insulation, supporting applications in lasers, transistors, and other electronic devices, with optional metallization for conductivity.
• Wear and Corrosion Resistance: Maintains durability in chemical and laboratory environments, reducing wear and extending service life under abrasive or corrosive conditions.
• Versatile Industrial Use: Can be used in instruments, pumps, spacers, insulators, and various precision components across multiple industrial sectors.

Sapphire Tube Processing and Usage Recommendations

• Ensure full-surface polishing: Unpolished areas may contain subsurface damage that can initiate cracks under extremely high pressure. These micro-damaged regions are often the first to fail and may lead to complete tube fracture.
• Avoid sharp edges: Chamfering the transition between the end face and the cylindrical surface is recommended. Sharp edges are prone to impact damage, and even minor collisions can create stress points that result in cracking.
• Maintain proper thermal management: Sapphire’s mechanical properties decrease significantly at high temperatures. Although a precise temperature-strength relationship is not yet defined, controlled temperature gradients are essential. Because sapphire has much lower thermal conductivity than metals, rapid temperature changes can create large internal gradients between the inner and outer walls, increasing the risk of thermal shock and breakage.

Sapphire Tube Applications

• Optical view tubes, sensor windows and light-guiding protection.
• Thermocouple protection and high-temperature or high-pressure monitoring.
• Chemical, laboratory and semiconductor equipment requiring hard, insulating sapphire components.