Function of Intumescent Fireproof Paint
Thermal Expansion Under Heat:
When exposed to high temperatures (typically around 200°C to 250°C / 392°F to 482°F), the paint undergoes a chemical reaction and expands significantly (up to 50 times its original thickness).
Formation of a Protective Char Layer:
This expansion forms a thick, insulating charred layer. The char acts as a thermal barrier that slows down heat transfer to the underlying material.
Delay in Structural Failure:
For materials like steel, which can lose structural integrity quickly at high temperatures, this insulation gives critical extra time (usually 30, 60, or 120 minutes depending on the product) before reaching a failure point.
Smoke and Flame Spread Reduction:
While not its primary function, the char layer can also help reduce flame spread and smoke generation, contributing to safer evacuation conditions.
Preservation of Load-Bearing Capacity:
In buildings, especially high-rises or industrial settings, maintaining the strength of structural elements during a fire is essential for preventing collapse and allowing safe evacuation.
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