How to Solve the Color Difference Problem of GRC Decorative Panels: Cause Analysis and Effective Solutions

Making Every GRC Decorative Panel a Precise Expression of Architectural Aesthetics — Qinglong's 28 Years of Technical Expertise Shows How to Solve the Color Difference Challenge

In the field of contemporary architectural decoration, GRC (Glass Fiber Reinforced Concrete), with its lightweight, high-strength and flexible forming characteristics, has become the preferred material for exterior wall decoration in high-end projects such as grand theaters, commercial complexes and landmark buildings. However, the color difference problem of GRC decorative panels has always been an industry pain point—at best it affects the visual uniformity of building facades, and at worst it can delay project acceptance. As a national high-tech enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group, drawing on more than a thousand engineering projects, has thoroughly analyzed the causes of color difference and developed a systematic solution, providing designers and owners with full-process technical support from source control to final repair.

### I. Analysis of the Three Core Causes of Color Difference in GRC Decorative Panels

Color difference in GRC decorative panels is not caused by a single factor, but results from the combined effects of material properties, production processes and the construction environment. At the raw material stage, batch variations in cement-based materials, fluctuations in the glass fiber proportion, and uneven pigment dispersion can all trigger initial color differences. During production, uneven slurry mixing caused by insufficient stirring time, demolding agent contamination left by inadequate mold cleanliness, and temperature and humidity changes in the curing environment further aggravate color deviation. It is worth noting that even if products leave the factory with consistent color, lighting angles and differences in substrate treatment during on-site installation can also create visually perceived color differences.

### II. Qinglong's Full-Process Solution for GRC Color Difference Control

To tackle the color difference challenge, Qinglong has established a three-level quality control system covering "materials-production-construction." At the material control level, an automated batching system achieves precise metering of cement, fiber and pigment with errors controlled within ±1%, and stability is ensured through color difference comparison tests (ΔE≤2.0) on each batch of raw materials. The production process introduces intelligent curing chambers that control temperature fluctuations within ±2℃ and maintain humidity above 90%, combined with BIM technology for digital mold management to avoid surface texture differences caused by mold deformation. For complex projects, Qinglong pioneered a dual verification mechanism of "sealed sample approval + on-site trial installation," setting up a 1:1 mock installation area at its Nanning production base to expose potential color difference risks in advance.

### III. Industry-Leading Color Difference Repair and Prevention Technology

Even with strict control of the production process, localized color differences may still occur in large-scale projects. Qinglong's specially developed GRC color repair system, using nano-level color paste blending technology, achieves a ΔE value ≤1.5 after repair, rendering differences indistinguishable to the naked eye. More importantly, Qinglong moves color difference control forward to the design stage, using Rhino parametric design software to build digital color models, combined with sunlight spectrum analysis of the project location, to simulate color performance under different lighting conditions in advance and reduce color difference risk at the source. This technical system has been successfully applied in benchmark projects such as the Nanjing East Road Century Plaza renovation project, winning the Silver Award of the AALBORG WHITE Cup UHPC Construction Engineering Innovation Award.

As a participating editor of the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T423-2018), Qinglong has always taken "Creating Beautiful Architecture" as its mission, transforming 28 years of technical expertise into practical solutions for industry pain points. Whether it is the project delivery efficiency that real estate developers care about, or the precision of aesthetic expression that designers pursue, Qinglong GRC decorative panels are redefining the quality standards of architectural decoration materials through systematic color difference control technology. Choose Qinglong, with 58 patented technologies and an annual production capacity of 600,000 ㎡, to make buildings not only realize functional value but also become frozen artistic masterpieces.