Can be used intumescent paint on wood

Intumescent Fire Retardant Acrylic Coatings: Effects of Additive Ratio

Ammonium polyphosphate (APP), pentaerythritol (PER) and expandable graphite (EG) were used as intumescent additives by varying their ratios as 1: 1: 3 or 1: 3: 1 or 3: 1: 1. APP, PER and EG were used as the acid source, carbonating agent and propellant, respectively. Despite the different roles of APP, PER and EG, the physical mechanism of exfoliation of graphite played an important role in fire protection in all compositions.

Differences in scope of protection

With higher loads from EG the fire resistance time was higher. However, there were clear differences in the scope of protection when testing in the furnace under one-dimensional heat transfer conditions (bench-scale) in contrast to three-dimensional large-scale tests. Parameters that are not inherent in the coating system, such as cohesion, cracking, delamination from the substrate, rapid and non-directional expansion and even higher heat flows that occur at the edges of the I-steel section, influence the fire behavior.

The study was published in Progress in Organic Coatings Volume 150, January 2021.

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