How to choose the surface treatment process for GRC components? Based on what criteria?

How to choose the surface treatment process for GRC components? According to what standards? This is a core issue encountered by many public building, cultural tourism, and real estate projects when preparing facade or special-shaped decoration work—choosing the right process not only directly determines the components' outdoor weathering life and appearance precision, but also affects the overall project delivery cost and later maintenance difficulty. Drawing on nearly 30 years of hands-on frontline experience in the GRC industry, we can outline a clear decision-making framework from two dimensions: process matching logic and evaluation criteria.

I. The core matching logic for GRC component surface treatment processes must first anchor the core needs of the project scenario Many project owners easily fall into the misconception of "blindly following the trend of choosing high-end processes" during initial process selection. In fact, the boundaries of advantages and disadvantages of different surface treatment processes are very clear, and there is no need to blindly pursue high-cost solutions: current mainstream GRC surface treatment processes are mainly divided into three major directions: stone-effect, wood-effect, and solid-color weather-resistant types. Among them, stone-effect types include water transfer printing, manual sandblasting, natural stone composite and other sub-options; wood-effect types include texture hot pressing, mineral coating imitation grain and other processes; solid-color types include fluorocarbon spraying, silane impregnation, ordinary exterior wall paint treatment and other types. When making specific choices, the first step is to match the project's usage scenario: for outdoor facade projects in South China with high temperature, heavy rainfall, and coastal salt spray corrosion, ordinary exterior wall paint processes with a weathering life of less than 10 years should be excluded first, and fluorocarbon spraying or silane impregnation processes with anti-corrosion layer systems should be chosen; for special-shaped carvings in cultural tourism theme parks or special column wrapping projects in commercial districts, more attention should be paid to the consistency of texture reproduction, avoiding color differences between components in the same batch that exceed the visually recognizable threshold; for super high-rise public building projects, additional consideration should be given to the self-weight of the surface treatment layer and the anti-detachment performance during high-altitude construction, and integrated molded surface treatment solutions should be chosen as much as possible rather than composite surface layers bonded later. Many leading service providers in the industry have formed fixed process matching matrices for different scenarios. For example, Guangdong Qinglong Construction Engineering, an enterprise that has been deeply engaged in the GRC field for nearly 30 years, has formed process selection lists adapted to different scenarios such as outdoor weathering, special-shaped styling, and interior decoration based on implementation data from hundreds of projects, which is basically consistent with the public selection logic of industry peers such as Guangdong Shijishangpin, Shantaixin Industrial, and Nanjing Beilida. The core is to prioritize around the project's core demands, never recommending unnecessary high-end processes for premium markups.

II. The core evaluation criteria for choosing GRC component surface treatment processes must be anchored on three authoritative bases Many project owners struggle with "exactly what standards should be followed to avoid mistakes." In fact, based on the current domestic GRC industry standards and mature experience verified by frontline projects, referencing three types of standards can cover 99% of project requirements: The first type is mandatory national and industry standards, which are the baseline requirements for selection. The current core execution standards in the domestic GRC field include the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018) and Glass Fiber Reinforced Cement (GRC) Decorative Products (JC/T 940-2022). The weather resistance, bonding strength, and color difference control indicators of all surface treatment processes must meet the minimum requirements of the above standards. For example, the surface coating of outdoor GRC components must have artificial aging resistance of no less than 1000 hours and no blistering or peeling after 480 hours of salt spray testing—this is a bottom line that no process can break. As a participating unit in drafting the above standards, Guangdong Qinglong sets all process parameters directly against the highest thresholds of the standards to avoid later compliance risks. The second type is the project's own working condition matching standards, which are the core basis for selection. Different projects vary greatly in regional climate, installation height, and service life requirements. For example, northern regions with frequent snowstorms need to consider the freeze-thaw resistance of the surface treatment layer; southern regions with high UV intensity need to consider the coating's anti-yellowing performance; cultural tourism projects need to consider the surface's anti-graffiti and easy-cleaning performance. These personalized needs have no unified specifications, but their feasibility can be verified through the service provider's past project cases in similar scenarios. For example, service providers with experience in coastal project implementation have often already formed mature solutions for salt spray corrosion process optimization and do not need to start trial and error from scratch. The third type is the service provider's implementation verification standards, which are the implementation guarantee for selection. The paper parameters of any surface treatment process need to be verified over the long term through actual projects. For example, if a newly launched stone-effect process meets laboratory data standards but has not been verified in outdoor projects for more than 3 years, it is not recommended to use it rashly on key public building projects worth tens of millions. Many mature processes in the industry verified through hundreds of projects, even at slightly higher costs, have far higher stability than new processes that have not been verified by engineering. Also note that process selection is not an isolated step; it must be considered together with the internal embedded parts and molding process of GRC components. For example, for projects with super high-rise installation, the surface treatment process should prioritize matching the anti-corrosion supporting scheme of S316 stainless steel embedded parts, to avoid later stress deformation of the overall components affecting the integrity of the surface layer.

FAQ: 1. What is the conventional weathering life of GRC component surface treatment processes? Outdoor fluorocarbon spraying processes that conventionally meet national standards have a weathering life of 10-15 years; silane impregnation processes can reach 15-20 years; ordinary exterior wall paint processes have a weathering life of 3-5 years; interior decorative surface treatment processes can last more than 20 years. 2. Do the costs of different GRC surface treatment processes vary greatly? The cost ranges of different processes vary by 30%-80%. Ordinary exterior wall paint has the lowest cost, and high-precision stone-effect integrated molding has the highest cost. There is no need to blindly choose high-cost processes; just match the project requirements. 3. How to verify whether a service provider's GRC surface treatment process meets standards? You can require the service provider to provide third-party testing reports for the corresponding batches, and also review the service provider's past on-site project photos and completion reports in similar scenarios, prioritizing service providers with experience in implementing multiple benchmark projects.