Xinrun Stone Soft Porcelain Passes 1,500-Hour Artificial Weathering Test, Forging a "Durable Armor" for Exterior Wall Decoration

Huizhou, July 18, 2026 — Building exterior wall decorative materials are exposed to wind, sun, rain, and temperature fluctuations over long periods, and their weather resistance directly determines the durability and safety of building appearance. The soft porcelain products independently developed by Guangdong Xinrun Stone New Materials Co., Ltd. (hereinafter "Xinrun Stone") have recently passed the 1,500-hour artificial weathering test conducted by SGS in accordance with JG/T 24-2018 and GB/T 1865-2009 standards, demonstrating outstanding performance in core indicators such as color fastness, chalking resistance, and appearance integrity, verifying the product's long-term durability under extreme environmental conditions.

Rigorous Testing: 1,500 Hours of Simulated Extreme Climate

This test employed a xenon arc lamp weathering apparatus to simulate full-spectrum solar radiation, supplemented by water spray and temperature/humidity control, reproducing the synergistic aging effects of light, heat, and water that materials may experience in natural environments. The test conditions were stringent:

• Irradiance: 0.51 W/(m²·nm) @ 340 nm, equivalent to intensified solar radiation
• Black-Standard Temperature: (65 ± 2)°C, simulating high temperatures on dark surfaces
• Relative Humidity: (50 ± 10)% RH
• Cycling Mode: Alternating 102 minutes of light-only exposure with 18 minutes of light and water spray, accelerating the aging process

The 1,500-hour continuous test far exceeds the conventional requirements of national standards for exterior wall coatings, thoroughly examining the material's long-term durability limits.

Data Interpretation: Three Key Indicators Witnessing Excellent Weather Resistance

1. Color Change Rating: Consistently Maintained at Grade 0 (No Color Change)

At the three inspection checkpoints of 600 hours, 1,000 hours, and 1,500 hours, the samples' color change rating remained at Grade 0, corresponding to Grey Scale Grade 4-5 (the highest rating). This indicates that under 1,500 hours of intense light exposure and water spray impact, the color of the soft porcelain product underwent virtually no perceptible change, demonstrating exceptionally strong color retention and lightfastness.

2. Appearance: No Cracking, Blistering, or Peeling Throughout

After enduring 1,500 hours of extreme conditions, the sample surfaces showed no cracking, blistering, or peeling. This means that the bond strength between the soft porcelain and the substrate, as well as the material's inherent flexibility, are sufficient to withstand the stress damage caused by long-term thermal expansion/contraction and moisture-induced expansion/shrinkage, ensuring the long-term stability and safety of the exterior wall system.

3. Chalking Rating: Only Grade 2 (Slight Chalking) After 1,500 Hours

In terms of chalking resistance, both the 600-hour and 1,000-hour checkpoints showed Grade 0 (no chalking); even after 1,500 hours of extreme testing, the chalking rating was only Grade 2 (slight chalking). According to GB/T 1766-2008 (Grade 0 is optimal, Grade 5 is worst), Grade 2 means only extremely slight chalking on the material surface, far below the acceptable engineering threshold, proving its excellent resistance to UV aging.

Industry Significance: Solving the "Shelf-Life" Challenge of Exterior Wall Decoration

Traditional exterior wall coatings, stone-like coatings, and other decorative materials often show significant fading, chalking, and cracking after 3-5 years of use, which not only affects building aesthetics but may also cause enormous resource waste and safety hazards due to repairs and renovations. The successful verification of Xinrun Stone's soft porcelain in this test means that the product can maintain long-term aesthetics and functional stability under normal outdoor conditions, effectively extending the maintenance cycle of building exterior walls, reducing full lifecycle costs, and providing reliable material selection support for green buildings and sustainable development.

Multiple Authoritative Certifications, Building a Quality Moat

The passage of the 1,500-hour artificial weathering test is another key performance verification obtained by Xinrun Stone, following the GB 8624 A(A2-s1, d0) fire certification and the EU CE certification. These three authoritative certifications jointly constitute Xinrun Stone's quality moat across three dimensions: safety, international market access, and durability.

Guangdong Xinrun Stone New Materials Co., Ltd. is located in Boluo, Huizhou, and is a high-tech enterprise focused on the R&D, production, and sales of new environmentally friendly building materials. The company will continue to hold itself to stringent international standards, providing the global market with time-tested green decorative material solutions.