Sight Glass Failures Exposed: How METAGLAS® Prevents Catastrophic Plant Accidents

For decades, sight glasses have provided critical visual confirmation in industrial processes—but when the wrong material is specified, the consequences can be catastrophic.

Standard glass sight windows are vulnerable to cracking and shattering under pressure, ejecting shards at extreme velocities. In real-world incidents, sight glass failures have caused plant explosions, product recalls, millions in damages, and even loss of life .

That’s why engineers worldwide rely on METAGLAS® sight glass technology from LJ Star—the number one selling sight glass in the world and the only fused sight glass that has never had a documented safety failure.