High-Density Glass Wool vs. Mineral Wool: Which is Better for 60-Minute Fire Door Cores?

When engineering fire-rated hollow metal doors, the choice of core material determines not just the safety rating, but the longevity of the door itself. While mineral wool is traditional, modern High-Density Glass Wool offers significant advantages in weight reduction and structural integrity.

Thermal Integrity & A1 Rating Our glass wool solutions are rated Class A1 non-combustible. For a 60-minute fire test, the core must prevent heat transfer to the unexposed side. High-density variants (64-100 $kg/m^3$) provide a more uniform thermal barrier than standard loose-fill materials.

The Hydrophobicity Factor In humid climates like Saudi Arabia or South Africa, moisture absorption is the enemy of insulation. Traditional wool can sag, leaving the top of the door unprotected. Our glass wool features a hydrophobicity rate of $\geq 98\%$, ensuring the core remains stable and effective for the door's entire service life.

Hybrid Solutions For projects demanding extreme performance with limited thickness, many contractors are now using a hybrid layer: a core of high-density glass wool reinforced with a 5mm silica aerogel blanket. This combines the cost-efficiency of wool with the world-class insulation of aerogel.