Soft&Rigid Spray mineral wool

EcoIn supplies this blown-fibre mineral insulation in two distinct density grades, each optimised for different project requirements and performance targets.

The soft grade (120–150 kg/m³) is typically specified for thermal insulation of building envelopes, interior partitions, and mechanical services. At this density, the material combines low thermal conductivity (λ ≈ 0.036–0.040 W/m·K at 25°C) with excellent sound absorption, making it well suited to applications where thermal performance and acoustic comfort are both priorities. The lower density also reduces the dead load contribution to the structure, which can be a factor in large-span roof systems or prefabricated panel assemblies.

The rigid grade (200–250 kg/m³) is the standard choice for passive fire protection of structural steel and for applications where the insulating layer must resist mechanical damage without an additional protective finish. At higher density, the cured layer is robust enough to be painted or overcoated directly, and it maintains dimensional stability under sustained heat exposure well in excess of 1000°C.

When selecting between the two grades, consider the following factors. Fire resistance period: R60 and above on open steelwork typically requires the rigid grade to achieve adequate protection within practical thicknesses. Substrate orientation: overhead or steeply inclined surfaces may require the rigid grade, which develops higher early green strength and is less prone to sagging before the initial set is reached. Finish requirements: if a painted or trowelled surface finish is required, the rigid grade provides a better substrate. Your project specification should define the minimum density, not just the grade name, to ensure the applied material is verified against the design intent during inspection.