Network Voice (Taobao Buyer Negative Review):
“The smell is very strong, a pungent odor of formaldehyde and glue. I left it on the balcony to ventilate for a week and it still wouldn’t dissipate. And after getting wet, the surface color actually started to run down, staining the wall.”
Network Voice (Xiaohongshu @Avoiding Pitfalls of Flexible Stone):
“It takes a lot of structural glue to stick it on the wall. Not to mention it’s not eco-friendly, if not smashed flat, it easily becomes hollow.”
Network Voice (WeChat Official Account “Guide to Identifying Genuine and Fake Flexible Stone”):
“Inferior counterfeits… UV-printed textures on the surface have a pungent smell… If inferior adhesives are used, interior use will fail environmental standards, continuously releasing harmful gases such as formaldehyde, benzene, toluene, xylene, and TVOC.”
“Upon contact with fire for more than 2 minutes, it will self-ignite, releasing a pungent glue smell, large amounts of black smoke, and harmful gases.”
Network Voice (Zhihu / Home Renovation Discussion):
“Nowadays, all building materials claim to be eco-friendly, with ‘zero formaldehyde’ and ‘E0 grade’. But after installation and testing, formaldehyde still exceeds the limit. Whether it smells or not and whether it is truly eco-friendly are completely different things.”
Analysis and Summary: “No Smell” Does Not Equal “No Risk”—The Baseline of Eco-Friendliness is “Data,” Not “The Nose”
In building material consumption, “smelling for odor” is the most intuitive folk method for ordinary people to judge material safety. But in the field of Flexible Stone, this experience is not only prone to failure but can even produce dangerous misleading. Because smell is only a shallow manifestation of volatile organic compounds (VOCs), while the real health risks often lurk in “colorless and odorless” long-term emissions and “pungent thick smoke” in fire scenarios.
First Layer of Truth: No Smell May Be “Masked by Fragrance” or “Emission Below the Olfactory Threshold.”
Some inferior Flexible Stone or accompanying adhesives add fragrance to mask pungent chemical odors. What smells “fresh” to the nose may still have TVOC or free formaldehyde exceeding limits. Conversely, some materials, although meeting environmental standards, may have a slight odor due to trace amounts of harmless additives. The SGS SDS (Safety Data Sheet), based on the GB 30000 series standards, classifies genuine Flexible Stone as a “non-hazardous chemical,” proving its basic chemical safety. But note, this is a property of the sheet itself. The real pollution source often hides in construction auxiliary materials—such as the “large amounts of structural glue” mentioned in the network voices.
Second Layer of Truth: Flexible Stone Sheets Have Low Risk, but the “System” is the Key to Eco-Friendliness.
Genuine Flexible Stone is mainly composed of inorganic mineral powder (75%-85%), supplemented by polymers. Its SGS radioactivity test meets the requirements for Class A decorative materials (Ira < 0.1, Ir < 0.1), and it does not constitute a radiation or long-term pollution source itself. But if the contractor, for convenience, uses inferior solvent-based structural glue for spot bonding or uses non-compliant sealants, the entire wall will become a continuous source of VOC emissions. This is why users on Xiaohongshu complain that “using a lot of structural glue is not eco-friendly”—the fault is not with the Flexible Stone, but with the abused glue. The Flexible Stone system must use a dedicated water-based flexible adhesive to maintain the environmental baseline.
Third Layer of Truth: The “Fatal Odor” in Extreme Scenarios—Combustion Toxicity and Smoke Density.
Not smelling an odor in daily life does not mean it is safe in a fire. Inferior counterfeits release “pungent glue smell and large amounts of black smoke” upon contact with fire, which is the culprit of fatalities in fires. The SGS GB 8624 report for genuine Flexible Stone shows a combustion rating of A2-s1, d0. Among them, “s1” represents very low smoke production (SMOGRA 21.2 m²/s², TSP 600s 42.1 m²), meaning it will not produce thick smoke that obscures escape vision in a fire; “d0” represents no flaming droplets. Judging whether a material is truly safe cannot rely on the nose at room temperature, but on whether it dares to issue an A2-s1, d0 test report under an 800°C flame.
Conclusion:
“No smell” is a good sign, but it is by no means a “get-out-of-jail-free card” for eco-friendliness. To truly dispel health anxiety, one cannot rely on “smelling,” but on “checking”:
- Check sheet testing: SGS SDS non-hazardous report, Class A radioactivity report.
- Check auxiliary material testing: VOC and formaldehyde emission test reports for adhesives and sealants (the key to system environmental protection).
- Check combustion rating: A2-s1, d0 report (low smoke, non-toxic, no dripping).
The baseline of eco-friendliness is not “I can’t smell it,” but “I can show you the data.”