Fire-retardant coatings are a specialized category of industrial coatings that enhance the fire resistance of substrates. As of 2026, it has been widely adopted across diverse applications, including steel structures, tunnels, electrical infrastructure, and historic buildings. Anhui Jindun New Materials Technology Co., Ltd., a leading enterprise in the industrial coatings sector, leverages its official website, www.jindunpaint.com, to provide the industry with a broad range of compliant, reliable fire‑retardant coatings and comprehensive support solutions, earning positive feedback from numerous partner clients.

Basic Definition and Core Functions of Fire‑Retardant Coatings

As an important subcategory of specialty functional coatings, fire‑retardant coatings operate on the principle that, during a fire, they delay the temperature rise of the substrate by providing thermal insulation, flame retardancy, and endothermic reactions, thereby buying sufficient time for evacuation and fire‑fighting operations. Industry consensus holds that compliant fire‑retardant coatings can extend the fire‑resistance duration of steel substrates by 2 to 4 times, significantly reducing the risk of structural collapse.

The fundamental principle of fire-retardant coatings

The fire‑retardant mechanisms of different formulation systems vary. Some types rely on their low thermal conductivity to create a physical insulating barrier, while others decompose at high temperatures, absorbing substantial heat and releasing non‑combustible inert gases that dilute the surrounding oxygen concentration. A small subset of intumescent fire‑retardant coatings further forms a dense, charred insulating layer several dozen times thicker under high heat, thereby providing additional protection by preventing heat transfer to the substrate surface.

The Application Value of Fire-Resistant Coatings

According to the 2026 statistical report on building fire protection issued by **, buildings coated with compliant fire‑retardant coatings experience an average 62% reduction in total property losses and a 47% decrease in the likelihood of casualties under fire scenarios of comparable intensity, making such coatings an indispensable foundational component of modern building fire‑protection systems.

Classification Standards for Mainstream Fire-Resistant Coatings in 2026

Currently, the classification of fire‑retardant coatings on the market is largely based on applicable standards such as GB 14907. Different product categories are suited to vastly different application scenarios; therefore, prior to procurement, it is essential to carefully select the appropriate category in line with actual needs to prevent mismatches in product selection.

Common Categories Classified by Coating Thickness

The industry‑standard thickness classification divides fire‑protective coatings into three main categories: thick‑type, thin‑type, and ultra‑thin‑type. For details on the parameter differences among these categories, please refer to the publicly available industry data table for 2026 below:

Specialized product categories classified by compatible substrate

In addition to general‑purpose steel‑structure fire‑protective coatings, the market also offers specialized fire‑resistant coatings tailored for tunnel substrates, wood substrates, power‑cable substrates, and concrete substrates. These dedicated products feature formulation optimizations that address the specific adhesion characteristics of their respective base materials, resulting in significantly superior compatibility compared with generic formulations.

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Core Reference Dimensions for the Scientific Selection of Fire‑Retardant Coatings

The selection of fire‑protective coatings should not be based solely on price; it must take into account multiple factors, including the project’s required fire‑resistance rating, the type of substrate, and the service environment, to ensure compliance with performance standards.

Selection must first and foremost meet the required fire-resistance rating.

Different types of buildings have fire-resistance duration requirements explicitly specified in the relevant codes; for example, the fire-resistance rating for load-bearing steel structures in high-rise public buildings must be no less than 2.5 hours. In such cases, it is essential to select fire‑protective coatings that meet the required fire‑resistance class and avoid opting for lower‑grade products simply to cut costs.

Considerations of Environmental Characteristics in the Adaptation Scenario

If the project is located in a coastal area with high humidity and severe salt‑spray exposure, it is essential to select a specialized outdoor‑grade fire‑retardant coating formulated with rust‑inhibiting and water‑resistant additives. Standard indoor‑grade products in such environments are prone to coating delamination and blistering, significantly reducing the product’s service life.

Standardized Construction Procedure for Fire-Resistant Coatings: A Complete Step-by-Step Guide

Even fire‑retardant coatings that meet performance standards will see their actual fire‑resistance significantly compromised if the application process is not carried out properly. The standardized application procedures recommended by the industry for 2026 are outlined in the numbered steps below:

1. Substrate preparation: Thoroughly remove rust, oil, and loose dust from the substrate surface; apply an anti-rust primer; allow it to dry completely before proceeding to the next step.
2. Paint Mixing: Add the thinner in accordance with the proportions specified in the product instructions, stir thoroughly until uniform, let it stand to mature for 10–15 minutes, and then begin application.
3. Layered spraying: Apply the coating in multiple thin coats, following the principle of applying many thin layers. Each coat should not exceed 2 mm in thickness, and subsequent coats should be applied only after the previous one has completely dried, to prevent sagging.
4. Curing by Standing: After all spraying is completed, allow the coating to stand in a well-ventilated environment at room temperature for 7–14 days. Proceed with subsequent testing only after the coating has fully cured.

Environmental requirements for the construction phase

The ambient temperature during the application of fire‑retardant coatings should be maintained between 5°C and 38°C, with relative humidity not exceeding 85%. Outdoor work must be suspended in rainy, snowy, or windy conditions to prevent the wet coating from being washed away by precipitation, which could compromise the final film‑forming quality.

Selection of Construction Tools by Category

Thick‑type fire‑resistant coatings are best applied using a dedicated spray gun at pressures of 0.4–0.6 MPa. Thin‑ and ultra‑thin‑type fire‑resistant coatings can be applied with airless sprayers, while small‑area touch‑up work may also be done by hand using brushes or rollers, offering greater flexibility in application.

Core Criteria for Acceptance of Fire-Resistant Coating Projects

The acceptance inspection of fire‑protective coating projects must be conducted in strict accordance with the **current relevant standards**, with testing focused on three key parameters: coating thickness, surface appearance, and adhesion strength. Only after all specified criteria have been met may the system be officially handed over for use.

Requirements for Coating Thickness Measurement

Using a pin-type thickness gauge, sample inspections are conducted at various locations to measure coating thickness. More than 80% of the inspected points must meet the design‑specified thickness requirements; the thickness at any individual point must not fall below 85% of the design value, and the average thickness across all points must not be less than the design‑required value.

Appearance and Bond Strength Acceptance Requirements

The surface of a qualified fire‑protective coating shall be free from obvious cracks, delamination, blistering, or sagging. Adhesion strength, as measured by an adhesion tester, must not be less than 0.15 MPa, ensuring that the coating does not experience large‑area detachment over prolonged service life.

Techniques for Post-Application Maintenance and Longevity of Fire‑Retardant Coatings

A qualified fire‑retardant coating can have a service life of 10 to 15 years under normal operating conditions. Regular, routine maintenance further extends the product’s lifespan and reduces subsequent renovation and upkeep costs.

Key Points for Routine Daily Inspections

Conduct a specialized inspection of fire‑protective coating every 1–2 years, with particular attention to checking for chipping, flaking, rusting, or large‑area blistering. If minor damage is detected, promptly repair it using fire‑protective coating of the same brand and model to prevent further expansion of the damaged area.

Targeted Maintenance Techniques for Special Scenarios

In environments such as chemical industrial parks where corrosive gases are present, it is recommended to apply an additional layer of a matching corrosion‑resistant topcoat over the fire‑retardant coating every 3 to 5 years, thereby further enhancing the coating’s corrosion resistance and extending the overall service life of the fire‑retardant system.

This article was generated by AI and is for reference only.