WANDA perlite is used in the production of thick and thin fireproof coatings for steel structures:

According to the classification of fire protection mechanism, steel structure fire retardant coatings are divided into:
a. Intumescent steel structure fire retardant coating: The coating expands and foams at high temperatures to form a fire-resistant and heat-insulating protective layer for steel structures. The industry is accustomed to using the old standard name, that is, intumescent fire retardant coatings are a combination of ultra-thin structural fire retardant coatings and thin steel structure fire retardant coatings.
b. Non-expanding steel structure fire retardant coating: The coating does not expand and foam at high temperatures, and it itself becomes a fire-resistant and heat-insulating protective layer. The industry is accustomed to using the old standard name, that is, non-intumescent fire retardant coatings are thick fire retardant coatings.
1. Ultra-thin structural fire retardant coating (expanded steel structure fire retardant coating)
Ultra-thin steel structure fire-retardant coatings refer to steel structure fire-retardant coatings with a coating thickness of less than 3 mm (inclusive), good decorative effects, the ability to expand and foam at high temperatures, and a fire resistance limit generally within 2 hours. This type of steel structure fire retardant coating is generally a solvent-based system with excellent bonding strength, good weather and water resistance, good leveling, and good decorative properties; it slowly expands and foams when exposed to fire to form a dense and hard fire retardant and heat insulation layer. , this fireproof layer has strong fire impact resistance, delays the temperature rise of steel, and effectively protects steel components. Ultra-thin intumescent steel structure fire retardant coating can be applied by spraying, brushing or roller coating. It is generally used on building steel structures whose fire resistance limit is within 2 hours. A new variety of ultra-thin steel structure fire retardant coatings with fire resistance of 2 hours or more has emerged. It is mainly based on polymethacrylate or epoxy resin with special structure, amino resin, chlorinated paraffin, etc. as the base material. The mixture is composed of highly polymerized ammonium polyphosphate, dipentaerythritol, melamine, etc. as a fire retardant system, titanium dioxide, wollastonite and other inorganic refractory materials, and 200# solvent oil as the solvent. Various light steel structures, grids, etc. often use this type of fire retardant coating for fire protection. Due to the ultra-thin coating of this type of fire-retardant coating, the use of thicker and thinner steel structure fire-retardant coatings is greatly reduced, thereby reducing the total project cost and providing effective fire protection to the steel structure with very good fire protection effects.
2. Thin steel structure fire retardant coating (expandable steel structure fire retardant coating)
Thin-coated steel structure fire-retardant coating refers to a steel structure fire-retardant coating with a coating thickness greater than 3 mm and less than or equal to 7 mm, which has a certain decorative effect, expands and thickens at high temperatures, and has a fire resistance limit of less than 2 hours. This type of steel structure fire retardant coating generally uses a suitable water-based polymer as the base material, and is combined with a flame retardant composite system, fire retardant additives, refractory fibers, etc. Its fire retardant principle is the same as that of the ultra-thin type. For this type of fire retardant coating, the water-based polymer selected must have good adhesion, durability and water resistance to the steel substrate. Its decorative properties are better than thick fire-retardant coatings, but inferior to ultra-thin steel structure fire-retardant coatings. The general fire resistance limit is within 2 hours. Therefore, it is often used in steel structure fire protection projects with a fire resistance limit of less than 2 hours, and spraying construction is often used. It occupied a large proportion in a period, but with the emergence of ultra-thin steel structure fire retardant coatings, its market share was gradually replaced.
3.Thick steel structure fire retardant coating (non-expansion steel structure fire retardant coating)
Thick steel structure fire retardant coating refers to a steel structure fire retardant coating with a coating thickness greater than 7 mm and less than or equal to 45 mm, with a granular surface, low density, low thermal conductivity, and a fire resistance limit of more than 2 hours. Since most of the ingredients of thick fire-retardant coatings are inorganic materials, their fire-proof performance is stable and their long-term use effect is better. However, the particles of the coating components are larger and the appearance of the coating is uneven, which affects the overall beauty of the building. Therefore, it is mostly used for Structural concealment engineering. This type of fire retardant coating utilizes the granular surface of the material in a fire, with low density, low thermal conductivity or the heat absorption of the material in the coating to slow down the temperature rise of the steel and protect the steel. This type of fire retardant coating uses suitable inorganic binders (such as water glass, silica sol, aluminum phosphate, refractory cement, etc.), and is combined with inorganic lightweight thermal insulation aggregate materials (such as expanded perlite, expanded vermiculite, sepiolite , floating beads, fly ash, etc.), fire retardant additives, chemicals, reinforcing materials (such as aluminum silicate fiber, rock wool, ceramic fiber, glass fiber, etc.) and fillers, and has the advantage of low cost. Spraying is often used in construction, and is suitable for indoor and outdoor concealed steel structures, high-rise all-steel structures and multi-story factory steel structures with fire resistance requirements of more than 2 hours. For example, the fire resistance limit of columns in high-rise civil buildings and columns supporting multiple floors in general industrial and civil buildings should reach 3 hours, and they need to be protected by this thick fire retardant coating.