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Calcined Kaolin
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Ultra Calcined Kaolin
- Ultra white and ultra-fine calcined kaolin for coating industry
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Ultra Calcined Kaolin
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Non-expanding fireproof coating for steel structures
Product introduction
Non-expanding steel structure fireproof coatings are made from porous insulating materials and inorganic insulating materials. This product is non-toxic, non-flammable, asbestos-free, and features lightweight, quick drying, moisture resistance, freeze-thaw resistance, corrosion resistance, acid resistance, alkali resistance, heat insulation, and anti-aging properties. When applied to the surface of steel components, it forms a fire-resistant insulating protective layer upon exposure to fire, relying on its non-flammability and low thermal conductivity, thus delaying the direct impact of fire on load-bearing components and enhancing the fire resistance limit of the steel structure. It is suitable for fireproof coating and protection of load-bearing steel components in various new, expanded, and renovated industrial and civil architectural projects.
Construction techniques
1. Steel structure substrate surface treatment
1.1 Before construction, clean the substrate surface of oil stains and floating dust. If there are water stains or condensation on the substrate surface, use a cotton cloth or towel to dry it.
1.2 For areas where the rust-proof layer has been damaged, repair according to the anti-corrosion coating construction process. Wait until the rust-proof layer is completely dry before proceeding with construction.
2. Construction environment
During the construction period of non-expanding steel structure fireproof coatings and during the curing period of the coating, the environmental temperature should not be lower than 5°C. It is not advisable to construct when wind speed exceeds 5 m/s, or during rainy days, or if the component surface has condensation.
3. Storage requirements
Materials must be stored to prevent water, moisture, and direct sunlight. The storage environment temperature should be between (5-35)°C, and the shelf life of the fireproof coating is one year.
4. Construction tools
Stirrer, air compressor, spray gun, trowel, putty knife, etc.
5. Mixing
5.1 Interface layer
The mixing time for the interface agent should not be less than 10 minutes. After mixing, the paint should be uniform and free of lumps. The mixing ratio is fireproof coating: fireproof coating adhesive: water = 1:0.2:0.6 (weight ratio). Each component should be added strictly according to the proportion, and the amount of water can be adjusted appropriately for spraying. The water used must be tap water; avoid using wastewater or sewage.
5.2 Main coating paint
When mixing the main coating paint, it is recommended to use a mortar mixer, with a rotation speed of no less than 100 rpm, and a mixing time of 10-15 minutes. After mixing, the paint should be uniform and free of lumps. The mixing ratio is powder material: water = 1:0.75 (add an appropriate amount of fireproof coating adhesive for higher bonding strength). The amount of water used for mixing can be adjusted according to the construction method. The mixed paint must be used within 60 minutes (principally mix and use immediately, especially in hot weather), to avoid reduced adhesion and other adverse effects. The water used for mixing the paint must be tap water; avoid using wastewater or sewage. (Note: Do not use fireproof coatings that have clumped or settled.)
6. Construction process
6.1 Interface layer construction process: After uniformly mixing the interface layer, use a handheld spray gun for spraying, with a construction thickness of 2-3 mm. The construction must be uniform, ensuring the steel does not show through.
6.4 Main coating construction process: After the interface layer has basically solidified and hardened, start the main coating construction. Initially, use a spraying method, with each layer's thickness not exceeding 10 mm, and a minimum interval of 12-24 hours between layers. As the construction thickness approaches the target thickness, use a troweling method to apply the coating to the required fire resistance limit thickness. The interval time can be adjusted based on different environmental temperatures and humidity.
7. Construction precautions
7.1 Ensure the interface layer has basically solidified and hardened before applying the main coating.
7.2 The single-layer thickness of the main coating should not exceed 10 mm, with a minimum interval of 12-24 hours between layers.
7.3 During construction, ensure every surface of the steel structure reaches the specified thickness.
7.4 Curing time: After completing all construction, the curing time is generally 28 days.
8. Special attention for winter construction:
8.1 In winter, avoid rain and snow during the fireproof coating construction and curing stages, ensuring the environmental temperature does not fall below 5°C.
8.2 In winter, the surface temperature of the steel structure should be almost consistent with the surrounding environment's temperature and humidity. Lower temperatures may cause condensation or frost, so avoid early morning or late evening work. If possible, consider starting construction on the building roof first to cover it, minimizing outdoor work.
8.3 In winter, due to low temperatures, the drying speed of fireproof coatings is slower, so extend the construction intervals and curing times accordingly.
8.4 Spray application should not be carried out when wind speed exceeds 5 meters per second, as strong winds can reduce the strength of the coating.
8.4 Spray application should not be carried out when wind speed exceeds 5 meters per second, as strong winds can reduce the strength of the coating.