BK7 vs K9 Optical Glass: Which is Best for Optical Domes?
Felix Glass breaks down the key differences between BK7 and K9 optical glass for custom optical domes. Both are high-quality materials, but they serve distinct use cases based on optical performance, durability, and budget.
BK7 Optical Glass
With a refractive index of ~1.51 and excellent transmittance across the visible spectrum, BK7 is a cost-effective, easy-to-process choice. It’s ideal for standard applications including CCTV camera domes, underwater housings, and general optical components. If you need reliable performance without premium pricing, BK7 is a practical solution.
K9 Optical Glass
K9 glass offers a slightly higher refractive index (~1.52) and superior optical clarity, making it preferred for high-precision projects. It performs better under temperature fluctuations and delivers sharper imaging, perfect for aerospace domes, medical imaging lenses, and high-end security systems.
Quick Selection Guide
- Choose BK7 for cost-effective, standard optical domes
- Choose K9 for higher precision, demanding applications, and enhanced clarity
At Felix Glass, we offer custom sizing, AR/AF/AG coating, and full OEM/ODM support for both BK7 and K9 optical domes. Whether you need standard or custom specifications, our team can deliver the right solution for your project. Contact us today for a free quote.
