Fireproofing systems must be selected for the fire scenario they are expected to resist. Cellulosic and hydrocarbon fires have different heat-release patterns, so a product designed for one exposure should not automatically be assumed suitable for the other.

What is a cellulosic fire?

Cellulosic fires involve ordinary combustible materials such as wood, paper, fabrics and furnishings. They are the main design scenario for offices, residential buildings, hospitals, hotels and most public buildings. Temperature rises progressively according to the standard cellulosic time–temperature curve.

What is a hydrocarbon fire?

Hydrocarbon fires involve fuels, oils, gases or petrochemical materials. They can reach very high temperatures much faster and produce intense heat flux. Refineries, fuel storage areas, offshore facilities and some industrial plants therefore require systems specifically tested for hydrocarbon exposure.

Why the distinction matters

A fireproofing system is a complete assembly consisting of the substrate, primer, coating, reinforcement where applicable and finish coat. Its classification depends on a tested configuration and defined thickness. Substituting a component or using a cellulosic-rated product in a hydrocarbon hazard may invalidate the intended performance.

Selection checklist

• Identify the credible fire scenario and required rating.
• Review the product’s test reports and technical certificate.
• Confirm compatibility with the steel primer and environmental conditions.
• Calculate the required thickness for each steel section.
• Use trained applicators and record inspection results.

Cementitious and intumescent options

Both cementitious and intumescent coatings can be suitable when they have the appropriate evidence for the specified fire curve. Intumescent coatings expand under heat and form an insulating char, while cementitious systems protect through a stable mineral layer. Project appearance, exposure, maintenance and budget influence the final choice.

Conclusion

The safest specification begins with the hazard, not the product name. Abrock Pooshesh Bartar evaluates the fire scenario, required resistance period and site conditions before recommending and applying a compatible passive fire protection system.