Structural Steel Fire Retardant CoatingThree Common Questions About Spraying
　　
One: The coating layer is too thin
　　
The purpose of applying fire-resistant coatings to steel structures is to enhance their fire resistance limit. The performance of the fire resistance in steel structures is closely related to the thickness of the coating applied. Different thicknesses of the same type of fire-resistant coating lead to varying fire resistance limits. If the thickness of the fire-resistant coating on steel structures is not applied according to design specifications, the steel's fire resistance limit cannot meet fire safety requirements. Statistics indicate that issues with overly thin coatings account for 25% of such problems.

　　Surface features protuberances

　　
To ensure a uniform and flat surface of the coating, while meeting the required thickness, Article 3.4.5 of the "Technical Specification for the Application of Fire Retardant Coatings on Steel Structures" clearly stipulates during the application of thick-coating fire retardant coatings on steel structures: The coating after spraying should have bumps removed to ensure uniformity and flatness. However, some construction units disregard this requirement, with some emphasizing that the steel columns should be decorated after spraying, and bumps are not a concern, etc., accommodating themselves. Such issues account for 10%. If bumps are present, they must be removed after measurement to ensure the column surface is uniform and flat before inspection; otherwise, the work is deemed不合格.
　　
Incorrect Selection Type
　　
Different types of fire-resistant coatings have varying thicknesses when applied to steel structures, and their fire resistance limits are not the same. To ensure that the fire resistance of the steel structure meets the fire protection requirements, different types of fire-resistant coatings must be applied to different parts of the steel structure. If the wrong coating is chosen...Structural Steel Fire Retardant CoatingThree Common Types of Spraying Issues: Even if the coating reaches the required thickness, it may not meet the fireproof standards. Therefore, Article 2.0.4 of the "Technical Specification for the Application of Fire-Resistant Coatings for Steel Structures" stipulates explicitly: "For exposed steel structures indoors, lightweight roof steel structures, and steel structures with decorative requirements, when the fire resistance limit is specified to be less than 1.5 hours, thin-coating fire-resistant steel structure coatings should be selected"; "For concealed steel structures outdoors, high-rise full steel structures, and multi-story factory steel structures, when the fire resistance limit is specified to be more than 1.5 hours, thick-coating fire-resistant steel structure coatings should be selected."