Flexisurf was tested according to ASTM E84-91a Standard Test Method for Surface Burning Characteristics of Building Materials. This test method is also published under the following designations: NASI 2.5, NFPA 255, UBC 42-1 and UL 723.

Test Objective: The ASTM E84-91a (25 foot tunnel) test method is intended to compare the surface flame spread and smoke developed measurements to those obtained from the tests of mineral fiber cement board and select grade red oak flooring. The test specimen surface (18” wide by 24 feet long) is exposed to a flaming fire exposure, adjusted to cause a 25-foot spread of flame along a red oak calibration specimen in 5.5 minutes. During the 10-minute test duration, flame spread over the specimen surface and density of the resulting smoke are measured and recorded. Test results are presented as the computed comparisons to the standard calibration materials. The mineral fiber/cement board forms the zero point, while the red oak flooring is set as 100 for smoke measurements. Thus, with a relative zero established by the non-combustible cement board, all test specimens are compared to select grade red oak flooring, and the results expressed as Flame Spread Index and Smoke Developed Index.

Test Results:	Flame	Smoke			Specimen Data:	Specimen	Red Oak
	Spread	Developed			Flexisurf Thickness	00.250
	Index	Index			Time to Ignition (min:sec):	00:24	00:50
Mineral Fiber/Cement Board	0	0			Time to Max. Flame Spread (min:sec):	09:28
Red Oak Flooring	100	100			Max. Flame Spread (ft):	6.0
Flexisurf	20	1110			Max. Temperature (deg. F):	599
					Time to Max. Temperature (min:sec):	10:00
					Flame Spread x Time Area (min x ft):	37
					Smoke x Time Area (min x %s):	930	84
					Temperature x Time Area (min x deg. F):	4764	9381
					Unbounded Flame Spread Index:	18.89
					Unbounded Smoke Developed Index:	1107.72
					Total Fuel (natural gas) Consumed (ft3)	47.65
					Temperature x Time Area for
					GRC Board (min x deg. F):	5653

Conclusion:

Flexisurf meets the UL Class 1 for Flame Spread but does not meet UL Class 1 for Smoke Developed.

Smoke content: HCL, CO and CO₂

Flexisurf was tested according to ASTM E-648 “critical radiant flux of floor covering systems, using a radiant heat energy source”. To pass the test, the critical radiant flux (CRF) must be larger than 0.12 w/cm².  The CRF is related to the time of burn, the distance of the burn and the heat required to sustain a flame. The CRF will be less than 0.12 w/cm² if the burn distance is more than 90 cm. As you can see from the report, the minimum CRF achieved was .61 w/cm² and the maximum burn distance was 34 cm. In essence, the Flexisurf product was tested at UL and the determination was made that the materials passed this ASTM E-648 test well within acceptable limits. It should be understood that the results as shown below apply only to the particular samples submitted for testing. The test results indicated in this Report are not intended to imply Listing, Classification or other Recognition of any product or materials.

Test #                       Sample                                    Burn                           Total Burn                                      Critical Radiant
                                  Type                                 Time (mins)                   Distance (cm)                                       Flux (w/cm²)
  1                          1/8” grid                                         8:00                              13                                                       0.99
  2                          1/4” grid                                       12:38                              10                                                       1.01
  3                          1/8” matte                                    13:04                              34                                                       0.61
  4                          1/4” grid                                       13:20                              20                                                       0.89

The products tested under this Preliminary Investigation are not covered under the Follow-Up Service Program of Underwriters Laboratories Inc. The Classification Marking of Underwriters Laboratories Inc on the product is the only method provided by Underwriters Laboratories Inc to identify products, which have been produced under its Classification and Follow-up Service. No use of a Classification Marking has been authorized as a result of this investigation. In no event shall Underwriters Laboratories Inc be responsible to anyone for whatever use or non-use is made of the information contained in this Report and in no event shall Underwriters Laboratories Inc, its employees, or its agents incur any obligation or liability for damages, including, but not limited to, consequential damages, arising out of or in connection with the use, or inability to use, the information contained in this Report.

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