Intumescent Coating Calculator

Calculate intumescent fire protection coating DFT and quantity from steel section factor, fire rating, and critical temperature.

Section factor Hp/A (m⁻¹)

Fire rating (minutes)

Critical temperature (°C)

Steel surface area (m²)

Volume solids (%)

Waste factor (%)

Tab to move between fields

Required DFT (µm)

250

Coats required

Required WFT (µm)368

Theoretical volume (L)0.04

Practical volume (L)0.04

Coverage rate (m²/L)2,720

Coating weight (kg)0.1

How to Use This Calculator

Enter structural steel section: profile type (I-beam, column, hollow section) and section factor (Hp/A in m-1).
Enter required fire resistance rating (minutes: 30, 60, 90, 120) and design temperature (°C).
Read required intumescent dry film thickness (mm) for the specified fire resistance period.
Select intumescent product and verify the manufacturer's DFT table matches the calculated requirement.
Apply in multiple coats if required DFT exceeds the maximum single-coat thickness in the product data sheet.

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