Network Voice (Overseas Industry Technical Data on Flexible Stone’s Physical and Fire Performance):
“PHOMI’s core line is flexible stone veneer: tiles 2-5 mm thick that flex to a 20 cm bend radius and carry Class A2 or B-s1,d0 fire ratings.”
Network Voice (Overseas Technical Q&A on Installation Pitfalls):
“product can bend, it cannot be folded, as folding will cause it to break.“
Network Voice (Overseas Technical Blog on Curved Surface Cracking):
“Cracking on curved flexible stone installations almost always comes from exceeding the panel’s minimum bend radius, bonding over an out-of-tolerance substrate.”
Network Voice (Domestic Fire Safety / Drawing Review Communication Group):
“The drawings show Flexible Stone as A2 grade, but does this batch on site have the corresponding test report? Also, the insulation layer is B1 grade—is the protective layer thick enough? Has the fire barrier been installed according to code? We can’t accept the system just by looking at a single material report.“
Analysis and Summary: Understanding the “Prerequisites” Behind SGS Reports is the Key to Turning Technical Advantages into Engineering Reality
In the marketing language of Flexible Stone, “A2 fire rating” and “bendable for irregular shapes” are the two most frequently touted selling points. However, real engineering failures often stem from taking these indicators “out of context.” Fireproofing and bending radius are technical parameters with strict prerequisites, not physical properties that can be overdrawn indefinitely.
First Confirmation: Bending Radius—”Can Bend” is an Engineering Advantage, “Fold Arbitrarily” is a Construction Disaster.
Overseas technical data explicitly specifies the “20 cm bend radius” parameter, which is precisely the physical boundary of Flexible Stone. The SGS flexibility test (JG/T 311-2011, no cracking around a 200mm cylinder) corresponds to exactly this magnitude (radius 100mm).
- Engineering Reality: Flexible Stone can perfectly conform to cylinders and curved walls. But when encountering right angles, acute angles, or designs requiring an extremely small bend radius, absolutely no “forced folding” is allowed. As warned by overseas technical Q&A: “can bend, but folding will cause it to break.” At internal/external corners and irregular terminations, whole-piece wrapping (following the curve) or transition with corner guards must be used; violent folding like paper is strictly prohibited.
- Root of Failure: Cracking on curved surfaces is overwhelmingly due to “exceeding the minimum bend radius,” or uneven substrate curvature causing uneven adhesive thickness. Engineering must adhere to “mock-up first,” using physical objects to verify the true performance of the model under that curvature, rather than rigidly applying a flat test report to irregular designs.
Second Confirmation: Fire Rating—”A2 Grade” is the Material Pass Line, “System Compliance” is the Passport for Drawing Review.
The A2-s1, d0 report issued by SGS according to GB 8624-2012 is the hard currency for Flexible Stone to open the doors of high-rise buildings. A2 (non-combustible), s1 (very low smoke production), d0 (no flaming droplets)—these three points precisely cut off the fatal paths of vertical fire spread and ignition from dripping.
- Engineering Reality: But the questioning from domestic fire drawing review experts is very precise—”We can’t accept the system just by looking at a single material report.” A2 proves the performance of “the sheet under specific installation conditions (e.g., no joints, fixed to a specific substrate).” In actual engineering, Flexible Stone is typically applied over an exterior wall insulation layer. Is the insulation layer compliant? Is the non-combustible protective layer thick enough? Has the fire barrier been installed as required? These system constructions are the key to whether the entire exterior wall passes fire acceptance.
- Root of Failure: Equating a “material A2 report” with “system fire compliance” is the highest-frequency cause of rejection during drawing review. When delivering to review experts, a complete “material report + system construction drawing + node details” must be provided to form a closed-loop evidence chain.
Conclusion:
“Can bend” and “A2 grade” are the confidence on which Flexible Stone stands in retrofits and irregular buildings. But the implementation of technology must be built on respecting physical boundaries and subordinating to system construction. Keep the radius bottom line when bending, complete the system construction when fireproofing, and translate the test conditions of SGS reports into on-site executable and acceptable engineering standards; only then can technical advantages be truly transformed into engineering reality that withstands the test of time.