To what extent is the steel structure fireproof coating qualified?

Ultra-thin steel structure fireproof coating refers to the steel structure fireproof coating with a coating thickness of no more than 3mm, this kind of fireproof coating expands and foams when fired, forming a dense fireproof insulation layer, which is a new variety developed in recent years. It can be sprayed, brushed or roller coated, and is generally used in building steel structures that require a fire resistance limit of less than 2h.

Product specifications.

Serial No. Fire Resistance Time Construction Thickness Construction Passes Theoretical Dosage.

1 120min 7 times.

2 90 min 5 times.

3 60 min 3 times.

4 30 min 2 times.

Description: The thinner the first time, the better, try to control it around the left, about 4 hours after the surface is dry before applying the second time, and then each time is controlled on the left and right, until the specified thickness.

Thin-coated steel structure fire-retardant coating: The steel structure fire-retardant coating with a coating thickness of 3 7mm is called thin-coated steel structure fire-retardant coating. This kind of coating can expand and foam when exposed to fire, and the refractory insulation layer formed by expansion foam can delay the heating of steel and protect steel components.

This kind of steel structure coating is generally composed of suitable latex polymer as the base material, and then with flame retardants, additives, etc.

Product specifications.

Serial No. Fire Resistance Time Construction Thickness Construction Passes Theoretical Dosage.

1 150min 4 5 times 4

2 120 min 4 times.

3 90min 3 times.

4 60 min 2 times.

Description: The thinner the first time, the better, try to control it around the left, about 4 hours after the surface is dry before applying the second time, and then each time is controlled on the left and right, until the specified thickness.

Thick-coated steel structure fireproof coating refers to the coating thickness of 8 50mm, and the fire resistance limit of this kind of fireproof coating can be reached. The coating does not expand in the fire, relying on the non-flammability and low thermal conductivity of the material or the heat absorption of the material in the coating to delay the heating of the steel and protect the steel. This kind of fire retardant coating for steel structure adopts suitable binders, and then combines inorganic lightweight materials and reinforcing materials.

Product specifications.

Serial No. Fire Resistance Time Construction Thickness Construction Passes Theoretical Dosage.

1 180min 26 5 times 13

2 150 min 21 4 times.

3 120min 17 3 times.

4 90min 13 2 times.

Foreign steel structure fireproof coatings have been developed in the direction of ultra-thin, super weather resistance and excellent decorative performance, and the weather resistance test has been carried out with reference to the European aging test standard method, with excellent weather resistance, and the weather resistance of the coating film meets the requirements of outdoor use. Therefore, in order to catch up with or surpass similar foreign products and meet the needs of the market, the research and development of outdoor ultra-thin steel structure fireproof coatings with high weather resistance is the direction of future development.

According to the design fire level, the thickness of the coating and the surface effect can meet the requirements.

Look at the specifications, and design drawings requirements.

The national standard for the inspection of fire retardant coatings for steel structures is GB14907-2018.

This standard stipulates the terms and definitions, classification and model, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of fire retardant coatings for steel structures.

This standard is applicable to all kinds of steel structure fireproof coatings used on the surface of building (structure) steel structure.

The following is answered by Hubei Master Tu Fire Retardant Coating, we have more than 10 years of experience in coating construction, and we have also encountered many projects that need to be foolproof package acceptance. Therefore, everyone generally chooses the construction plan, contractor, material and package acceptance to construct.

Clause. First, the main control items;

l. The varieties and technical properties of steel structure fireproof coatings meet the design requirements and meet the requirements after testing. Check product quality certification documents, Chinese marks and inspection reports.

2. Before the fireproof coating is coated, the rust removal of the steel surface and the coating of the anti-rust primer shall meet the design requirements and the provisions of the relevant standards. Surface rust removal with a shovel and with the "steel surface rust grade and rust removal grade before painting" GB8923 specified in the ** control observation inspection. The primer coating is used for the inspection of the paint film thickness gauge, and each component is tested in 5 places, and the value of each place is the average of the dry paint film thickness of the coating at 3 measuring points 50 meters apart.

3. The bonding strength and compressive strength of steel structure fireproof coatings should comply with the provisions of CECS24:90 in the "Technical Regulations for the Application of Steel Structure Fireproof Coatings". The inspection method shall comply with the provisions of GB9978 of the "Test Method for the Performance of Fireproof Spraying Materials for Building Components", and the inspection report shall be inspected.

4. The coating thickness of thin-coated fireproof coatings should meet the design requirements of the relevant fire resistance limits. The thickness of the thick-coated fire-retardant coating coating of 80% or more shall meet the design requirements of the relevant fire resistance limit, and the thickness of the thinnest part shall not be less than 85% of the design requirements. Inspect with a coating thickness gauge, stylus and steel ruler.

The measurement method shall comply with the provisions of CECS24:90 of the Technical Regulations for the Application of Fire Retardant Coatings for Steel Structures and Appendix F of this specification.

5. The crack width on the surface of the thin-coated fireproof coating should not be greater than; The crack width on the surface of the thick-coated fire retardant coating should not be greater than 1.

Clause. 2. Macro inspection, general items;

1. The model, name, color and validity period of the fireproof coating are equal to the quality certification documents, and there is no crust, agglomeration, gel and other phenomena after opening. Observational examination.

2. There should be no dirt such as oil, dust and sediment on the coating base of fireproof coating. Observational examination.

3. The fireproof coating should not be miscoated or missed, and the coating should be closed without appearance defects such as delamination, hollowing, obvious depression, loose pulverization and floating slurry, and the mastoid has been removed, observed and inspected. Now a large number of steel structure super high-rise buildings have emerged, and the use of fireproof coating for steel structures is more popular. In the event of a fire accident in a high-rise building, the fire can not be extinguished in a short time due to the limitation of fire-fighting equipment, so in the design and construction of the building, the fire protection of the surface of the steel structure should be increased to increase its fire resistance limit, and the necessary fire prevention measures should be formulated in the building design to ensure the safety of personnel and reduce the loss of assets.

1.The thickness of the coating should meet the design requirements, if the thickness is lower than the original standard, it must be greater than 85% of the original standard, and the continuous area length of the insufficient thickness is not more than 1m, and similar situations will not occur within the range of 5m.

2.The coating should be completely closed, and the bottom should not be exposed or missed.

3.Cracks should not appear in the coating, and if there are individual cracks, their width should not be greater than 1mm.

4.The bond between the coating and the steel substrate and between the coatings should be firm, and there should be no hollowing, peeling and loosening.

5.The surface of the coating should be free of papillae, and the allowable deviation of the bus bar and the degree of loss should not be greater than 8mm.

<> adopts the "Application Technology of Fire Retardant Coatings for Steel Structures".

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Adopt the "Code for Acceptance of Construction Quality of Steel Structure Engineering".