StonePly® – The Facts

Why we say failure is NOT an option!


StonePly is committed to producing the finest quality. As the World leader in natural stone/honeycomb composite panels, StonePly observes rigorous quality control procedures and testing. Owners and specifiers receive the peace of mind that comes from knowing StonePly has been subjected to testing well beyond the code minimum. Testing has been performed at independent national laboratories, universities and at StonePly’s own research and manufacturing facilities.


Positive and Negative Wind loads ASTM E330 Tested to pressures in excess of 180 psf.


Salt Spray Resistance ASTM B117 300 hours. No deleterious effects.
Freeze/Thaw ASTM C67 100 cycles. No checking, delaminating, cracking or splitting.
Tensile Bond ASTM C297 Bond strength exceeds the strength of the stone itself. 330 PSI.
Water Resistance ASTM D2247 No deleterious effects after 120-day exposure.
Mildew/Fungus Resistance ASTM D3273 Passes. Tested with both granite and marble.
Water Penetration ASTM E331 No water penetration to the innermost plane of the wall.
Large Missile Impact Test ASTM 1996-05B Specifications for Performance of Exterior Windows, Curtain Walls, Doors and Impact Protective Systems Impacted by Windborne Debris in Hurricanes A weighted 2 x 4 was fired at the StonePly panel at 50 fps. There was no penetration
Air and Water Infiltration ASTM E 283-7 Passed
Accelerated Weathering ASTM G53 2000 hours. No deterioration.
Absorption – Freeze/Thaw Panels soaked in water @ 20 °C for 4 days, then placed at –10 °C for 2 hours and +20 °C for 2 hours. 100 cycles. No delamination or failure.
Uniform Static Deflection ASTM E 330-02 Standard Test Method for Structural Performance of Exterior Windows, Doors, Skylights and Curtain Walls by Uniform Static Air Pressure Difference. After three years of exposure to two different climates, three panels were tested under uniform static air pressure at 70 psf and 105 psf to test structural performance. No attachment or panel failure.
Static Pressure ASTM E 330-00 Standard Test Method for Structural Performance of Exterior Windows, Doors, Skylights and Curtain Walls by Uniform Static Air Pressure Difference. Static Pressure tests were performed to determine if it met the performance requirements for a category 5 hurricane force winds. The panel was tested at 160 psf. All the panels tested met or exceeded requirements.


Cyclic Pressure Loading ASTM E 1886-05 Standard Test Method for Performance of Exterior Windows, Curtain Walls, Doors, and Impact Protective Systems Impacted by Missile(s) and Exposed to Cyclic Pressure Differentials To test repeated positive and negative loads, over 4,500 positive and negative pressure cycles were applied at ±70 psf.
Flexural Strength ASTM C880 Standard Test Method for Flexural Strength of Dimension Stone.


Fourteen specimens were tested either wet or dry according to ASTM C880. Five wet specimens were tested and had an average strength of 1751 lb-in. Five dry specimens were tested before 100 accelerated weathering and had an average strength of 1749 lb-in. Four dry specimens were tested after 100 cycles of accelerated weathering and had an average strength of 1558 lb-in.



“Tunnel Test” ASTM E84 Flame spread  0
Smoke developed  0
Fire Endurance Test System remained in place during a 30-minute fire exposure test. Conducted per modified ASTM E119 “Standard Methods of Fire Endurance Tests of Building Construction and Materials.”
Diversified Fire Test Modified ASTM E108 Fire hazard = 0
Standard Fire Exposure Test ASTM E119 Fire resistance rating of one-hour and two-hour wall assemblies was not reduced by the addition of the StonePly.
Full Scale Multi-Story Fire Test UBC 26-4
(formerly UBC 17-6)
No lateral spread of flame from compartment of fire origin to adjacent spaces. The panels were subjected to a fire exposure from a 1250-pound crib, which was designed to simulate the ASTM E119 standard time/temperature curve for a minimum of 30 minutes. The crib was allowed to burn freely for approximately 45 minutes. Temperatures exceeded 920 °F on the face of the panels for the majority of the test.

·         No flame spread

·         No flame penetration

Intermediate Scale Multi-Story Fire Test UBC 26-9 (NFPA 285)
Radiant Heat Exposure Test NFPA 268 Standard Test Method for Determining Ignitibility of Exterior Wall Assemblies Using a Radiant Heat Energy Source Meets requirement for unrestricted fire separation distance. No flaming at 12.5 KW/m2 heat flux exposure. This test is designed to simulate a thermal radiation exposure to an exterior wall from a radiant panel heated to 1600 °F




  • Construction Consulting International
  • Materials Laboratory, University of Maine
  • Weiss Jandy and Associates
  • Independent Testing Laboratory
  • Dallas Labs


For more information on StonePly testing or general information about our panels, please contact us here or at 903-454-4630.

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