Low Thermal Expansion BK-7 Glass Optical Dome for Precision Instruments

1. Material:

   • BK-7 Optical Glass: A borosilicate crown glass composed of silica (69–72%), boron oxide (10–13%), and potassium oxide (8–10%). Renowned for high optical homogeneity and low impurity content.

   • Low Thermal Expansion Design: Engineered to minimize dimensional changes under temperature fluctuations.

2. Key Properties:

   • Thermal Stability: Extremely low coefficient of thermal expansion (CTE: ~7.1 × 10⁻⁶/K), ensuring minimal shape distortion in varying temperatures (-50°C to 150°C).

   • Optical Clarity: High transmission (>90%) across visible to near-infrared (350–2000 nm) wavelengths.

   • Mechanical Durability: Resistant to scratches, abrasion, and moderate chemical exposure (e.g., mild acids, humidity).

   • Homogeneity: Exceptional material uniformity, reducing light scattering and wavefront distortion.

3. Function:

   • Thermal Deformation Resistance: Maintains precise optical alignment in temperature-sensitive environments.

   • Environmental Protection: Seals precision instruments from dust, moisture, and mechanical stress.

   • Optical Performance: Preserves image/resource integrity by minimizing thermal-induced focal shifts or aberrations.

   • Wide Field of View: Hemispherical shape enables unobstructed 180° imaging or sensing.

4. Applications:

   • Space & Satellite Systems: Protects sensors in satellites/telescopes exposed to extreme thermal cycling.

   • Laser & Metrology Equipment: Ensures stability in laser cavities, interferometers, or coordinate-measuring machines (CMMs).

   • Aerospace Sensors: Shields navigation/guidance systems in aircraft/drones operating at high altitudes.

   • High-Precision Manufacturing: Used in semiconductor lithography or industrial inspection tools requiring micron-level accuracy.

5. Technical Advantages:

   • Dimensional Stability: Retains shape and optical alignment despite rapid temperature changes.

   • Broad Wavelength Compatibility: Suitable for multispectral applications (visible, NIR).

   • Custom Geometry: Available in diameters from 20mm to 500mm, with tailored thickness for load-bearing needs.

6. Target Industries:

   • Aerospace, defense, photonics, semiconductor manufacturing, metrology, and scientific research.

**Introduction**

Shanghai Longway Special Glass Co., Ltd. has been a professional supplier in the glass industry for over 20 years. With its expertise spanning across various fields, including optics, laser, imaging, and lighting etc., the company has established itself as a trusted partner for businesses worldwide. The company's commitment to providing high-quality glass products and services has earned it a reputation as a reliable supplier of choice among major corporations and small businesses alike.

**Our Team**

The team at Shanghai Longway Special Glass Co., Ltd. consists of professional experts with extensive experience in the field of glass manufacturing. These skilled technicians have honed their expertise through years of hands-on training and continuous education, ensuring that they remain up-to-date on the latest techniques and technologies.

**Our Capabilities**

Shanghai Longway Special Glass Co., Ltd.'s capabilities include:

* Cutting: Advanced cutting equipment allows for precise cuts in a variety of glass types.

* Grinding: High-speed grinding machines enable efficient surface preparation.

* Polishing: Automated polishing systems guarantee exceptional optical clarity.

* Molding: Sophisticated molding techniques permit the creation of intricate shapes and designs.

* Blowing: Expertise in blow-and-form processing enables the production of hollow glass products, such as bottles and jars.

* Tempering: Heat-treating equipment ensures that glass products meet or exceed industry standards for thermal shock resistance.

** Our Raw Materials**

The company offers a wide range of raw materials and processed glass products, normally including:

* Optical Glass: High-quality optical glass suitable for precision applications.

* Borosilicate Glass: Durable borosilicate glass ideal for laboratory equipment and medical devices.

* Quartz Glass: Pure quartz glass utilized in various industries, including electronics and optics.

* Float Glass: Large sheets of float glass suitable for architectural applications and flat glass products.

* Soda Lime Glass: Economical soda lime glass used for a wide range of industrial and commercial applications.

**Our Quality Control Process**

At Shanghai Longway Special Glass Co., Ltd., quality control is an integral part of the manufacturing process. Each product undergoes rigorous inspection to ensure that it meets or exceeds customer expectations. This commitment to excellence has earned the company a reputation as a trusted supplier of high-quality glass products.

**Our Commitment to Excellence**

At Shanghai Longway Special Glass Co., Ltd., we are committed to delivering exceptional quality glass products that meet or exceed customer expectations. Our team of professional experts is dedicated to providing expert advice and assistance in selecting the most suitable materials and processing techniques for specific needs. We take pride in our state-of-the-art facility, equipped with cutting-edge machinery and technology, ensuring that every product meets the highest standards.

**Why Choose Us?**

Shanghai Longway Special Glass Co., Ltd. is a trusted supplier of high-quality glass products, committed to delivering exceptional quality, innovation, and customer satisfaction. With over 20 years of experience and expertise spanning across various fields, we are well-positioned to meet the evolving needs of businesses worldwide. We look forward to serving your needs and meeting your expectations.