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 is performed at both independent national laboratories and universities as well as StonePly's own research and manufacturing facilities.
|Marble faced StonePly tested per ASTM D297 standard test for flatwise tensile strength of sandwich constructions after 130 heat and cool cycles
|272psi (39,168 psf) stone splitting indicating adhesive bond strength greater than the stone strength for marble
333psi (47,952psf) for granite
|Positive and Negative Wind loads
|Tested to pressures in excess of 180 psf. (245 mph wind) No delamination or disengagement. ASCE 7-98 results vary based on height, location, etc.
|Salt Spray Resistance
|300 hours. No deleterious effects.
|Passed. 100 cycles. No checking, delaminating, cracking or splitting.
|Passed. No deleterious effects after 120-day exposure.
|Passes. Tested with both granite and marble.
|Passed. 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
|Passed. A weighted 2x4 was fired at the StonePly panel at 50 fps. There was no penetration
|2000 hours. No deterioration.
|Air and Water Infiltration
|ASTM E 283-7
|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 (approx. 165mph wind) and 105 psf to test structural performance. No attachment or panel failure.
|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. (70psf is = 165mph winds)
(psf to mph conversion factors vary based on height, location, etc.)
|Modified ASTM C880 Standard method for determining flexural strength of dimension stone
|Average wet specimen tested 2,379psi
|Modified ASTM C666 "Standard test method for resistance of concrete to rapid freeze thaw"
|Average flexural strength 1996psi after 100 freeze thaw cycles
|Hard Body Impact
|From the "Code of practice for design of non-loading bearing external vertical enclosures to buildings". The test methods in BS 8200: 1985 measure the resistance of the specimen test wall to soft and hard body impact. Test is conducted on front face and side face of panel.
|No damage: Passed
Tested to 10 Nm
|Modulus of Rupture
|Modified ASTM C99
|Average wet specimen tested 3,073psi
|Modified ASTM C482 "Standard test for bond strength"
|333psi or 47,952psf
|Linear Thermal Expansion
|ISO 10545-8 tested from room temperature to 100°C
|12.53 X 10-6 per °C
|Accelerated Weathering in Acid Bath
|100 cycles of freeze + heat. -10 to 170 degrees F while partially submerged in a 4ph sulphurous acid solution.
|Less than 11% reduction in flexural strength. No significant difference in load deflection of exposed vs. not exposed specimens.
|Panel 42" by 58" exposed to 130 cycles rapid heating and cooling from 140 to 65 degrees F
|No damage or bowing recorded 272psi tensile bond strength
|Fastener Pull Out Strength
|Self-tapping #10 screws by 1/2" long
|112 lbs. average per screw
|24" X 34" Panel center loaded with 1,600lbs. Supports placed at 34"
|Deflection was less than .032"
|9/16" | 15/16"
|14 mm | 24 mm
|Standard Panel Size
(made to order)
|48" x 96" (4'x 8')
(Larger panels may be available by special order)
|1524 mm x 2845 mm
|Allowable Bending Moment
|Coefficient Of Thermal Expansion
|Load Uniform lbs/Sq. Ft.
|Span in inches
|Dow Corning 795 Silicone
|20 lbs per square inch
(see manufacturer's recommendations)
|#10 ss screws
|Flame spread 0
Smoke developed 0
|Fire Endurance Test
|Modified ASTM E 119
|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
|Fire resistance rating of one-hour and two-hour wall assemblies was not reduced by the addition of the StonePly.
|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
Read more about fire rating and testing.
The above tests were carried out at the following non-exhaustive list of laboratories: