Nullifire FB750 is a lightweight fire barrier comprising of a mineral fibre board coated with ablative water based sealant which can provide up to 4 hours fire protection. FB750 Fire Batt prevents the passage of fire and smoke by re-instating the compartment floor or wall when penetrated by building services. In order for the system to perform as certified it needs to be used in conjunction with fire rated mastic. This system also provides thermal acoustic and air sealing performances.
See data sheet for Nullifire FB750 – PDF