What are the specifications for the thickness of fire retardant coatings for steel structures?

China's current standard specification GB14907 2002 "Fire Retardant Coatings for Steel Structures".

Provisions: 1. Ultra-thin steel structure fireproof coating: coating thickness is less than or equal to 3 mm;

2. Thin steel structure fireproof coating: coating thickness greater than 3 mm and less than or equal to 7 mm;

3. Thick steel structure fireproof coating: the coating thickness is greater than 7 mm and less than or equal to 45 mm.

The steel structure usually loses its bearing capacity at a temperature of 450 650, and a large deformation occurs, resulting in the bending of steel columns and steel beams, so it is necessary to apply fireproof coatings when using steel structure buildings. The thickness specification of fire retardant coating for steel structure stipulates:

1. Ultra-thin steel structure fireproof coating: the coating thickness is less than or equal to 3mm;

2. Thin steel structure fireproof coating: coating thickness greater than 3 mm and less than or equal to 7 mm;

3. Thick steel structure fireproof coating: the coating thickness is greater than 7 mm and less than or equal to 45 mm.

The fire protection mechanism of the steel structure fireproof coating is to use the inherent good thermal insulation of the coating to prevent the transfer of fire heat to the steel, and form a dense glaze at high temperature, which can effectively isolate oxygen and have the effect of reflecting heat, delay the temperature rise of the steel structure, and play a role in fire protection.

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The original standard GB14907-2002 of the specification for fire retardant coatings for steel structures was replaced by GB14907-2018.

The thickness of the original GB14907-2018 specification steel structure fireproof coating is as follows:

Ultra-thin steel structure fire retardant coating: coating thickness less than 3 mm;

Thin steel structure fire retardant coating: coating thickness greater than 3 mm and less than 7 mm;

Thick steel structure fire retardant coating: coating thickness greater than 7 mm and less than 50 mm.

The new specification GB14907-2018 requires the following thicknesses:

The non-intumescent steel structure fire retardant coating is greater than 15mm.

The thickness of the intumescent steel structure fireproof coating is greater than.

The current standard for fire retardant coatings for steel structures GB14907-2018 "Fire retardant coatings for steel structures".

Inspection of fire retardant coating for steel structure - 3) Check the thickness of the coating.

The thickness requirements for fire retardant coatings for steel structures are as follows:

1. Ultra-thin steel structure fireproof coating. The coating thickness is less than or equal to 3mm. Ultra-thin steel structure fireproof coating refers to the coating thickness within 3mm (including 3mm), the decorative effect is good, it can expand and foam at high temperature, and the fire resistance limit of ultra-thin steel structure fireproof coating is generally within 2 hours.

2. Thin steel structure fireproof coating. The coating thickness is greater than 3mm and less than or equal to 7mm. Thin-coated steel structure fireproof coating refers to the steel structure fireproof coating with a coating thickness greater than 3mm, less than or equal to 7mm, a certain decorative effect, expansion and thickening at high temperature, and a fire resistance limit within 2 hours.

3. Thick steel structure fireproof coating. The coating thickness is greater than 7mm and less than or equal to 45mm. Thick steel structure fireproof coating refers to the steel structure fireproof coating with a coating thickness greater than 7mm and less than or equal to 45mm, with a granular surface, small density, low thermal conductivity and a fire resistance limit of more than 2h.

4. The coating expands and foams at high temperature to form a fireproof coating for steel structures with a fire-resistant and heat-insulating protective layer. The industry is accustomed to using the old standard name, that is, the intumescent fireproof coating is a collection of ultra-thin structural fireproof coatings and thin steel structure fireproof coatings.

The thickness of thin fire retardant coatings for steel structures is usually between 3 and 7 mm.

China's current standard GB14907 2002 "Steel Structure Fire Retardant Coating" stipulates: ultra-thin steel structure fire retardant coating: coating thickness is less than or equal to 3 mm; The decorative effect is better, it can expand and foam at high temperature, and the fire resistance limit is generally within 2 h of the steel structure fireproof coating.

Thin steel structure fireproof coating, coating thickness greater than 3 mm and less than or equal to 7mm; It has a certain decorative effect, expands and thickens at high temperature, and the fire resistance limit is within 2 h.

Thick steel structure fire retardant coating, coating thickness greater than 7 mm and less than or equal to 45 mm. Specifically, it should be determined according to the fire resistance time and fire resistance limit required by the drawing design and the quality inspection report provided by the manufacturer's products. It is a fireproof coating for steel structures with a granular surface, low density, low thermal conductivity and a fire resistance limit of more than 2 h.

Fire retardant coatings

Fire retardant coating is to brush the paint on the surface of the material, can improve the fire resistance of the material, slow down the spread of flames, or can stop the combustion within a certain period of time.

It is a special coating used on the surface of flammable substrates, which can reduce the flammability of the surface of the coated material, delay the rapid spread of fire, and improve the fire resistance limit of the coated material. It is applied to the surface of a flammable substrate to change the combustion characteristics of the material surface and prevent the rapid spread of fire; or applied to building components to improve the fire resistance limit of special coatings, called fire retardant coatings.

Thickness specification requirements for fire retardant coatings for steel structures may vary according to different countries, regions, and building standards. The following are general recommendations and common specification requirements:

1.International standards: Commonly used international fire retardant coating specifications include ISO12944 and ISO20340. These standards guide the selection and application of fire retardant coatings, as well as providing recommendations for coating thicknesses.

2.Domestic standards: In China, the commonly used steel structure fire retardant coating thickness requirements mainly refer to the "Technical Specification for Steel Structure Fire Retardant Coatings" (GB14907) and "Technical Code for Building Curtain Wall Insulation and Fire Retardant Coatings" (JGJ99).

According to the requirements of these codes, the thickness of the coating should be determined according to the fire risk level in which the structure is located, the fire resistance limit requirements and the fire performance of the material.

3.Thickness requirements: In general, the thickness specification requirements of fire retardant coatings for steel structures are usually between 100-1500 microns, which should be selected according to the fire risk level of the structure and the use of the building.

For example, in high-rise buildings, a common steel coating thickness requirement is 250-500 microns.

4.Specific application: The thickness of the fireproof coating is usually guided by the product technical information and the construction instructions of the fireproof coating provided by the paint manufacturer. During construction, the construction should be carried out in accordance with the requirements of the coating manufacturer to ensure that the expected fire performance is achieved.

In the process of coating selection and construction, in addition to the thickness specification requirements, factors such as the fire rating, required fire resistance time, surface preparation and construction technology of the coating should also be considered to ensure the safety performance of the steel structure in the fire.

Best practice recommends consulting with a professional fire retardant coating** or engineer to ensure compliance with relevant national and regional building codes and fire prevention requirements before selecting and constructing fire retardant coatings for steel structures. <>

Paint is a material that everyone often uses in decorating their houses. If you paint the walls of the room, not only can you make the room very smooth and bright, but you can also prevent your clothes from rubbing white on the wall. And the paint is relatively simple to operate, without stirring and processing, unpacking the bag, you can directly paint on the wall.

Thick steel structure fireproof coating, as the name suggests, is a kind of coating, but it has fireproof performance that ordinary coatings do not have. The following is a detailed introduction to the thick steel structure fire retardant coating.

Thickness requirements

According to GB14907-2002 "Steel Structure Fire Retardant Coatings" regulations: thick type: thin type of fire retardant coating with a coating thickness of 7-45mm

Ultra-thin fire retardant coating with coating thickness of 3-7mm: thick fire retardant coating with coating thickness less than 3mm belongs to non-intumescent steel structure fire retardant coating, which is generally composed of: binder, inorganic refractory insulation material, additives, etc.

The coating does not expand when exposed to fire, and improves the fire resistance time of the protected components through its own thermal insulation properties.

Spraying Method:

1. The preparation of the coating should be carried out in strict accordance with the requirements, and the component packaging should be put into the liquid material and stirred for 3-5min according to the requirements, and the powder should be added to the appropriate consistency.

2. Spraying equipment is used for construction, such as spraying equipment, air compressors, barrels, etc.; Coating tools such as mortar mixer tools, plastering boards, brushes, barrels, etc., spraying construction, each coating thickness is 2-8mm, the construction interval is 8 hours, and the construction interval with different ambient temperatures should be appropriately adjusted. During the construction of the coating and within 24 hours after construction, the ambient temperature shall not be less than 4 to prevent frost damage; In extremely dry and hot conditions, the home creates the necessary maintenance conditions to prevent the coating from losing water too quickly, and the local repair can be applied with the hand.

Outdoor thick steel structure fire retardant coatings are mainly used in construction, petroleum, chemical industry, electric power, metallurgy, national defense, light industry, heavy industry, etc.

Pre-construction preparation

1. Before spraying, the attachments, impurities and dust on the surface of the steel structure should be removed.

2. The steel structural parts with rust on the surface should be treated with rust and sprayed with anti-rust paint (** choose anti-rust paint with strong adhesion), and the paint should not be sprayed before drying.

3. The temperature of the construction environment should be guaranteed to be above 3.

Molded through the above introduction. I believe that everyone has a certain understanding of the thick steel structure fireproof coating. This is a special coating with fire-retardant properties.

Although this coating has excellent characteristics of fire resistance, but other coatings also have their unique advantages, we must combine their own needs when choosing coatings, and choose the most suitable coating for themselves. Here it is recommended that you choose some good quality paints, because if you buy bad quality paints, it may have a certain impact on the air. I hope the above introduction can help you choose a suitable thick steel structure fire retardant coating.

You can get it for free

Steel structure fire retardant coatings can be divided into the following types according to the thickness used:

1. Ultra-thin steel structure fireproof coating: the coating thickness is less than or equal to 3mm;

2. Thin steel structure fireproof coating: coating thickness greater than 3 mm and less than or equal to 7 mm;

3. Thick steel structure fireproof coating: the coating thickness is greater than 7mm and the coating thickness is less than or equal to 45mm.