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Gaco Western RoofFoam System 273
Gaco Western RoofFoam 273 is an HFC blown (zero-ozone depleting) liquid spray system that cures to a medium-density rigid polyurethane insulation for roofing applications. RoofFoam 273 contains material derived from naturally renewable resources and does not contain CFC’s, HCFC’s or other gases harmful to the environment. This system can be sprayed on clean dry substrates down to 45°F (7°C). Refer to Gaco Western General Instructions, SG-GacoFoam for spraying instructions. Gaco RoofFoam 273 is a Class A fire rated foam.
TECHNICAL INFORMATION
RoofFoam 273 is available in three standard reactivities for application in a wide range of temperatures. To ensure optimum performance, a minimum pass thickness of 3/4” (1.90 cm) is recommended with the maximum not to exceed 1.5” (4 cm) per pass. It is recommended that the resin side pre-heater be set 10 - 15°F warmer than the Isocyanate side to equalize component viscosities. For typical equipment settings, consult Gaco Western’s GacoFoam Spray Guide.
| Property | Test Temp. | ASTM Test | Unit | Value |
| Nominal Density Sprayed-in-Place: | 77°F (25°C) | D-1622-93 | lbs/ft³ | 2.5 – 3.0 |
| R Value: | 40°F (4.4°C) / 75°F (23.9°C) | C-518 | R | 7.1 |
| Compressive Strength Parallel to Rise: | 77°F (25°C) | D-1621-94 | psi | 50.1 |
| Tensile Strength: | 77°F (25°C) | D-1623-78 | psi | 54 |
| Compressive Strength Perpendicular to Rise: | 77°F (25°C) | C-193-94 | psi | 30.0 |
| Water Vapor Transmission | 77°F (25°C) | E-96-95 | perm-in | 1.8 |
| Dimensional Stability: | 158°F (70°C) 97% RH | D-2126-94 | % Vol. change | +5.98 |
| Dimensional Stability: | -20.2°F (-29°C)Amb. RH | D-2126-94 | % Vol. change | 0.4 |
| Recommended Service Temperature Range: | °F | -40°F (-4.4°C) to 200°F (93°C) | ||
| Closed Cell Content: | 77°F (25°C) | D-2856C-94 | % | 94.3 |
Fire Testing (UL-790 / ASTM E-108)
Gaco RoofFoam 273 has passed classification burn testing at Underwriters Laboratories and received a class A rating at a 2” incline.
TYPICAL LIQUID CHEMICAL PROPERTIES
"A" Component contains polymeric isocyanate. "B" Component contains polyol, catalysts and blowing agents.| Property | Test Temp. | ASTM Test | Unit | Value |
| Viscosity "A" Component: | 77°F (25°C) | D-2196-68 | cps | 180 ± 20 |
| Viscosity "B" Component: | 77°F (25°C) | D-2196-68 | cps | 700 ± 50 |
| Specific Gravity "A" Component: | 77°F (25°C) | D-1638-70 | 1.23 | |
| Specific Gravity "B" Component: | 77°F (25°C) | D-1638-70 | 1.15 | |
| Weight / Gallon "A" Component: | 77°F (25°C) | lbs/gal | 10.2 | |
| Weight / Gallon "B" Component: | 77°F (25°C) | lbs/gal | 9.6 | |
| Mixing Ratio "A" & "B" Component: | 77°F (25°C) | % by volume | 50 | |
| Stability When stored at 50° to 70°F (10° - 21°C) "A" Component: | 77°F (25°C) | months | 12 (1 year) | |
| Stability When stored at 50° to 70°F (10° - 21°C) "B" Component: | 77°F (25°C) | months | 3 |
NOTE: All hot work, i.e. welding, torches and open flame work must be completed prior to installation of the polyurethane foam insulation. Smoking in the same area while the spray polyurethane foam insulation is being applied shall be strictly prohibited.
Recommendations and safety considerations for application are outlined in Gaco Western’s Spray Guide SG-GacoFoam. The aforementioned information on this product is to be used as a guide and is subject to change without notice. These suggestions and data are based on information we believe to be reliable. They are offered in good faith, but without guarantee, as conditions and methods and use of our products are beyond our control. Any obligation of the seller or manufacturer shall have no force or effect unless it is in writing and signed by officers of the manufacturer.
The information herein is believed to be reliable but unknown risks may be present. ALL WARRANTIES OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE AND THAT GOODS ARE OF MERCHANTABLE QUALITY, ARE SPECIFICALLY DISCLAIMED. See Gaco Western for information concerning its limited warranty and its availability.
