Exterior Wall Steel Structure Water-Based Fireproof Coatings Market: CAGR of 5.8% (2026–2032)

According to YHResearch, the global market size for exterior wall steel structure water-based fireproof coatings is estimated at approximately RMB 3.138 billion in 2025, and is expected to reach about RMB 4.707 billion by 2032, representing a CAGR of 5.8% from 2026 to 2032.
In 2025, production volume reached 70,000 tons, with an average selling price of USD 6.2/kg.

Exterior Wall Steel Structure Water-Based Fireproof Coatings

Growth Drivers

1. Mandatory upgrading of fire safety regulations strengthening the market foundation

Fire safety is an indispensable requirement for steel structure buildings. In 2026 and beyond, global building fire protection standards continue to tighten. In China, the revised “Code for Fire Protection Design of Buildings” and mandatory standards such as GB 55037 impose explicit fire-resistance requirements for steel structures. These regulations make fireproof coatings effectively mandatory, especially for high-rise and public buildings, shifting demand from a “market choice” to a “regulatory requirement.” For exterior wall applications, dedicated W-type coatings must pass stringent weather resistance tests, further reinforcing the market position of compliant water-based products.

2. Dual-carbon policy and environmental regulations accelerating water-based substitution

Strengthening environmental regulations is a key driver of technological transition. The GB 30981 series new standards, effective June 2026, significantly tighten limits on VOCs and other hazardous substances in coatings, while also adding controls on SVOCs and APEOs. This directly reduces the viability of traditional solvent-based fireproof coatings. Under the “carbon peak and carbon neutrality” strategy, water-based fireproof coatings, with their low-VOC and low-pollution characteristics, have become a preferred solution for green building certification compliance. Policy incentives are continuously accelerating the structural substitution of solvent-based products by water-based alternatives.

3. Widespread adoption of steel structure buildings expanding market boundaries

The expansion of downstream applications provides a solid growth foundation for water-based fireproof coatings. Steel structures are increasingly used in super high-rise buildings, large-span industrial facilities, and transportation hubs, directly driving demand for fireproof coatings. Growth is also diversifying, with incremental demand coming from emerging applications such as wind power booster stations and prefabricated housing. In addition, renovation of aging buildings and maintenance demand in petrochemical and offshore engineering sectors provide a stable replacement market. As application scenarios become more complex, products with combined “fire protection + anti-corrosion” functions or enhanced durability are achieving higher value premiums.

Growth Constraints

1. Key performance limitations: insufficient weather resistance and anti-corrosion capability

Compared with mature solvent-based coatings, water-based fireproof coatings still show clear performance gaps in harsh outdoor environments. Their anti-corrosion protection for steel substrates is relatively weaker, particularly in coastal high-salt or high-humidity environments, where coating degradation may occur prematurely, leading to reduced fire protection performance. This structural limitation—difficulty in achieving both fire resistance and corrosion protection—restricts their application in scenarios requiring extremely high durability, such as cross-sea bridges and chemical industry bridges. Although epoxy zinc-rich primers combined with fireproof topcoats can partially mitigate this issue, they increase system complexity and overall cost.

2. Construction limitations: environmental sensitivity and unstable quality control

Water-based coatings use water as a dispersion medium, making film formation highly sensitive to temperature and humidity conditions. In low-temperature and high-humidity environments, drying is slow, and defects such as cracking, blistering, and reduced adhesion are more likely to occur, severely affecting fire protection performance. Since exterior wall construction takes place in open environments, environmental control is significantly more difficult than indoor applications. Combined with tight construction schedules and overlapping operations, achieving stable construction quality is challenging.

3. Systemic barriers: gap between standards and field execution

Although national and industry standards for exterior steel structure water-based fireproof coatings are well established, actual implementation often falls short. Common issues include insufficient rust removal on steel surfaces, thickness control based on worker experience, cost-cutting through under-application, and forced construction under unsuitable environmental conditions. More fundamentally, weak coordination among design, construction, and supervision stages leads to poor execution. Design documents often lack detailed construction and acceptance requirements; skilled fireproof coating contractors are in short supply; and supervision personnel often lack sufficient technical expertise, resulting in formalistic inspections. These systemic deviations significantly widen the gap between theoretical and actual fire protection performance.