Characteristics and construction technology of thick steel structure fireproof coating

When a thick steel structure fireproof coating is applied to the surface of a steel component, it creates a protective layer that resists fire and insulates against heat. This is achieved through the non-combustible nature and low thermal conductivity of the coating itself. In the event of a fire, the coating prevents direct exposure of the structural member to flames, thereby significantly enhancing the fire resistance of the steel structure.

The thick steel structure fireproof coating is non-corrosive and does not react with any anti-corrosion primer. It is odorless, lightweight, and has a large coverage area per unit, making it ideal for protecting load-bearing steel structures in various construction projects, including new builds, expansions, and renovations across industrial, commercial, and residential sectors.

Construction Technology for Thick Steel Structure Fireproof Coating

1. Before applying the fireproof coating, the steel component's surface must be thoroughly cleaned of rust and prepared according to design specifications and national standards. All dirt, oil, and debris should be completely removed to ensure proper adhesion.

2. The coating should be applied before interior finishing work begins and before any subsequent construction activities that might damage the coating. During the process, areas that do not require fire protection, such as walls, doors, windows, and mechanical components, should be shielded to avoid unnecessary coverage.

3. Prior to spraying, apply a steel structure interface agent. Once the interface agent is dry, the fireproof coating can be applied using either spraying or brushing methods. Mix the powder and emulsion in a ratio of 1:1 to create a smooth, thick fluid without lumps. Adjust the consistency based on the application method—ensuring it flows easily, adheres well, and doesn’t sag. For very large steel components, adding a steel mesh can help prevent cracking or peeling during the curing process.

4. When using a spray gun, use a pressure-type sprayer with an air pressure between 0.6 and 0.8 MPa. The nozzle diameter should range from 6 to 10 mm. Keep the spray gun perpendicular to the surface being coated, ideally at a distance of 40 to 60 cm for optimal coverage.

5. The first coat should not be too thick. Allow it to dry slightly before applying the next layer. Continue applying coats until the desired thickness is achieved, ensuring no dripping or uneven application occurs.

6. The brush-on method for applying fireproof coating is similar to how cement is applied. It requires careful and even distribution to ensure full coverage and adherence to the steel surface.

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The meter can be connected with computer as follows. Connect the meter and computer with a USB-to-RS485 converter( converter A+ end to transmitter A+ end, B- to B-, and GND to GDN); turn to device manager of the computer to check COM port connected with meter. Start the software, select the right COM port and click Connect; do not change any other parameters (if you do not know the right one, click Automatic options on the left, click Connect, plug & unplug the transmitter, and then check if it is connected). You can click Connect on the tool bar to disconnect or connect again. It will shown Connected/Not Connected at the bottom of this interface.


The flow direction is settable. There are 4 options, forward(default), reverse, absolute value & bi-direction. There is a direction mark on the sensor. Forward means the same direction with the mark on sensor, the meter will only count the flow in this direction; reverse means the opposite direction of the mark, the meter will only count the reverse direction; bidirectional means that the meter will measure both directions, it increases when it is forward and decreases when reverse; absolute means it increases no matter it is forward or reverse.

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