Discover precision optical performance with this premium 70mm diameter quartz glass window. Crafted from high-grade JGS1 material, this 4mm thick optical window delivers exceptional light transmittance, making it ideal for specialized laboratory and industrial applications. The round window features superior heat resistance, allowing it to maintain structural integrity and optical properties even under high-temperature conditions. Its dustproof design helps maintain clarity and functionality in demanding environments. The carefully polished surface and precise dimensions ensure consistent performance in optical setups, while the durable quartz construction provides reliable long-term use. Perfect for research facilities, industrial monitoring, or anywhere requiring high-performance optical components. The window's versatile properties make it suitable for various light transmission and observation applications where clarity and heat resistance are essential.