Assuming 30min protection is required, Zeroflame Aquasteel WB+ 30min System for Steel is a popular choice.

Should you require clarification this will be suitable for your project we would require as much of the following information as possible;

• Level of fire protection required (i.e. 30, 60, 90min, etc.)
• Each steel section dimension (i.e. 254x146x37 UB)
• Quantity and length of each section (or overall meterage for each section)
• Orientation (horizontal or vertical)
• Number of sides to be painted (all sides, 3 sides, 1 flange, etc.)
• Environment (internal, external, car park, chemical exposure, etc.)
• Application on site or in shop