For decades, fire-rated gypsum wallboard has been the default choice for interior partition walls, but modern building code updates and growing demand for long-term safety are pushing more project teams to compare ALC wall panels head-to-head with traditional drywall. The core difference lies in their fundamental fire-resistance mechanism: gypsum board delays fire penetration using tightly bound water in its core, but once all moisture evaporates after 60-120 minutes of flame exposure, the gypsum core rapidly degrades and loses load-bearing capacity.

ALC wall panels work on an entirely different principle: their fully inorganic aerated concrete structure does not contain any paper facers, organic adhesives or combustible components. When subjected to ASTM E119 standard fire tests, 100mm ALC panels maintain their full structural integrity for over 3 hours, with no cracking, spalling or through-fire penetration. Even 150mm thick ALC assemblies can achieve up to 4 hours of fire resistance, making them suitable for high-risk areas that require extended passive fire protection.

Another key advantage in real fire scenarios is ALC’s resistance to sudden structural failure. Gypsum walls often develop large cracks or collapse completely once dehydrated, creating open pathways for fire and hot gas to spread between rooms. ALC panels, by contrast, remain dimensionally stable even at temperatures exceeding 1000°C, preventing fire from spreading to adjacent compartments. This performance difference is especially critical for hotel corridors, hospital wards and school classrooms, where extended egress time is a mandatory safety requirement.