Underground metro stations present high risk profiles during structural fire incidents because escape options are restricted and heavy smoke can lead to visibility loss. Specifying passive fire safety barriers is crucial to secure egress routes.
1. Securing Cable and Utility Shafts
High-voltage power risers travel vertically across concrete station floors. If utility penetration gaps are not sealed, fire and toxic smoke will rise rapidly through floors. High-density Rockwool slabs coated with fire-retardant mastic provide certified 2-to-3-hour boundaries.
2. Smoke and Toxicity Limits (EN 45545)
Inclosed transit routes require insulation materials that do not emit halogenated toxic smoke. Stone wool is entirely mineral-based and emits negligible smoke or gases during heating, complying with modern transit safety specifications.