Hermetically Sealed Sight Glasses for Critical Applications
See clearly. Seal completely.
Electro-Seal manufactures some of North America’s most trusted hermetically sealed sight glasses, built to perform under pressure — literally. Engineered for visibility and reliability, our sight glasses enable safe, accurate observation of fluids, gases, and powders in environments where failure isn’t an option.
Whether it’s the clean conditions of a pharmaceutical plant or the intense pressure of deep-sea or aerospace systems, our fused glass-to-metal sight glasses offer superior durability and leak-proof performance.
Precision You Can Count On
With decades of experience in glass-to-metal sealing, we deliver both standard and custom-built sight glass assemblies for high- and low-pressure applications across:
We fuse quality materials with expert engineering to ensure every sight glass provides crystal-clear visibility, pressure containment, and chemical compatibility.
Material Options to Match Your Environment
Your system requirements are unique — and so are the materials we offer. Electro-Seal fabricates hermetically sealed sight glasses using a range of metals and materials to suit each application’s thermal, chemical, and mechanical needs:
Why Choose Electro-Seal for Sight Glasses?
Typical Applications
Electro-Seal sight glasses are often used in:
Need a special size, fitting, or viewing angle? We build to exact spec and performance demands.
Built for Safety, Visibility, and Performance
Our proprietary fusing process ensures a true hermetic seal between glass and metal — preventing leaks, fogging, or failure due to pressure changes, corrosion, or thermal stress. That means operators and engineers can safely monitor processes without system breach or risk.
Each unit is rigorously tested to meet or exceed industry standards, including:
Let's Build the Right Sight Glass for You
At Electro-Seal, we don’t just manufacture — we solve problems. Our engineers work directly with customers to design and produce sight glass solutions that work seamlessly within your systems, processes, and standards.
Whether you’re sourcing a replacement, upgrading a critical system, or designing new equipment, we’re here to deliver performance, reliability, and clarity.