Borosilicate glass is a glass made with silica and boron trioxide, valued for its low thermal expansion, heat resistance, and durability.
With a composition of about 80% silica and added boron trioxide, borosilicate glass offers superior resistance to heat, sudden temperature changes, and chemical corrosion compared to soda-lime glass. This makes it indispensable for applications where performance and stability are critical. In AV and commercial systems, it is used in lenses, mirrors, and filters for cameras, projectors, and specialized lighting. Its ability to maintain clarity and structural integrity under heat and mechanical stress also makes it suitable for enclosures, viewports, and protective housings in industrial environments, ensuring long-term reliability and optical precision.
Borosilicate glass quality is guided by ASTM (American Society for Testing and Materials) and ISO (International Organization for Standardization). Optical components may also follow specialized industry protocols for accuracy and durability.
Developed in the late 19th century by German chemist Otto Schott, borosilicate glass gained prominence for its resistance to thermal shock. It became a standard in laboratory glassware, industrial optics, and eventually AV and electronic systems, where precision and resilience are essential.