Intumescent Paints
Intumescent Paints expand 50-100× their volume when exposed to fire heat, producing a thick insulating char that protects the structural steel from strength loss. They differ fundamentally from ordinary paints by their thermal-chemical reaction. A common solution for protecting steel structures in large buildings and factories.
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Intumescent paints solve a core structural problem: steel loses 50% of its strength at 550°C and becomes plastic at 700°C, so unprotected steel structures can lose load-bearing capacity within 15-30 minutes of fire, depending on load and section. Chemistry: three main components react under heat: an acid source (such as ammonium polyphosphate), a carbon source (pentaerythritol or starch, reacting to produce carbon), and a blowing agent (melamine, releasing gas that expands the carbon into a thick foam). Reaction: begins at 200-250°C; the original thin coat (1-5 mm) transforms into a massive sponge-like char (50-250 mm) with low thermal conductivity, insulating the steel and keeping it below 550°C for the rated time. Common performance ratings: R30, R60, R90, R120 depending on coating thickness and section shape. Types: solvent-based (older, less eco-friendly, better water resistance), water-based (newer, environment-friendly, easy indoor application), epoxy intumescent (for exterior and humid exposure, used offshore), and hybrid systems (multi-layer). Application: on clean primed steel, with thickness engineered to section shape and rating required, finished with a protective topcoat. Applications: columns and beams in high-rise buildings, factory structures, offshore platforms, airports, large shopping centers, hospitals, and parking structures. A difference from ordinary paints: intumescent reacts under heat to protect the structure; ordinary paints are decorative. Review the model's acceptance file and the project's thickness schedule before application.
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Intumescent paints solve a core structural problem: steel loses 50% of its strength at 550°C and becomes plastic at 700°C, so unprotected steel structures can lose load-bearing capacity within 15-30 minutes of fire, depending on load and section. Chemistry: three main components react under heat: an acid source (such as ammonium polyphosphate), a carbon source (pentaerythritol or starch, reacting to produce carbon), and a blowing agent (melamine, releasing gas that expands the carbon into a thick foam). Reaction: begins at 200-250°C; the original thin coat (1-5 mm) transforms into a massive sponge-like char (50-250 mm) with low thermal conductivity, insulating the steel and keeping it below 550°C for the rated time. Common performance ratings: R30, R60, R90, R120 depending on coating thickness and section shape. Types: solvent-based (older, less eco-friendly, better water resistance), water-based (newer, environment-friendly, easy indoor application), epoxy intumescent (for exterior and humid exposure, used offshore), and hybrid systems (multi-layer). Application: on clean primed steel, with thickness engineered to section shape and rating required, finished with a protective topcoat. Applications: columns and beams in high-rise buildings, factory structures, offshore platforms, airports, large shopping centers, hospitals, and parking structures. A difference from ordinary paints: intumescent reacts under heat to protect the structure; ordinary paints are decorative. Review the model's acceptance file and the project's thickness schedule before application.
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