PROMASPRAY® F250 is an effective and permanent spray that increases the fire resistance of steel and concrete structures or trapezoidal sheets. PROMASPRAY® F250 is an industrially produced dry plaster mix. The basis of the product is a mixture of bio-soluble mineral fibers and a cement binder. In normal environments, PROMASPRAY® F250 does not crack or break. The insulation is also suitable for application to elements with complex shapes or as a fire protection membrane.