Promat PROMATECT^®-250 is a thin lightweight board product which can be used for this application to provide up to 120 minutes fire protection to steel. A single layer of 15mm PROMATECT^®-250 can provide 60 minutes fire resistance to most steel sizes. It is installed as a single layer with, typically, only a 3mm gap between the steel and the casing, no additional space is required. In this instance, the fire protection to the steel would only require 20mm clearance around the steel section. For more details please contact Technical Services. Email: technical.siniat@etexbp.co.uk or Tel 0800 145 6033