Polyurethane Flexible Membrane Liners
Secondary Containment Applications
In the petroleum business, underground and above-ground fuel storage tanks number in the hundreds of thousands. State regulations and insurance requirements are demanding that every one of those tanks be surrounded by a second container. With the recommended system in many cases being a flexible membrane excavation liner which is relatively low in cost, independent of the main containment and able to withstand much of the ground movement which can cause rigid containers to leak I the first place. And the same is true for the miles of piping that lead to and from these underground storage sites.
Throughout industry, the above and below ground storage of process chemicals, maintenance supplies, bulk chemicals, fertilizers and other “hazardous” substances are also under mandate to be contained with both a primary and back-up systems… and POLYURETHANE flexible membrane liners are doing the job up and beyond the standards set.
POLYURETHANE is a flexible membrane liner primarily designed for secondary containment of fuel. POLYURETHANE is extremely flexible, puncture resistant and provides unusually good heat sealing characteristics. POLYURETHANE is protected from ultraviolet degradation as well as the effect of underground fungi. POLYURETHANE is strong and hydrolytically stable for years of service in underground fuel and chemical.
POLYURETHANE
PHYSICAL PROPERTY SPECIFICATIONS
| POLYURETHANE | STANDARD | METRIC |
| Base Fabric Type | Nylon | Nylon |
| Base Fabric Weight (nominal) | 13.0 oz/yd² | 441 g/m² |
| Coating Type | Polyester based Polyurethane | Polyester based Polyurethane |
| Finished Coated Weight ASTM D751 | 32 oz/yd² ± 2 oz/yd² | 1085 g/m² ± 70 g/m² |
| Thickness ASTM D751 | 35 mil (nominal) | 0.89 mm (nominal |
| Grab Tensile ASTM D751 | 1000/1000 lbf (min) | 4450/4450 N (min |
| Strip Tensile ASTM D751 Procedure B | 600/600 lbf/in (min) | 526/526 daN/5 cm (min) |
| Adhesion ASTM D751 Dielectric Weld | 50 lbf/in (min) | 45 daN/5 cm (min) |
| Hydrostatic Resistance ASTM D751 Procedure A | 1500 psi (min) | 10.3 MPa (min) |
| Bursting Strength ASTM D 751 (Ball Tip) | 1200 lbf (min) | 5340 N (min) |
| Low Temperature ASTM D2136 | 1/8 in mandrel, 4hr Pass @ -50ºF | 3.2 mm mandrel, 4 hr Pass @ -46ºC |
| Dead Load ASTM D751 PASS @ | 2 inch Seam, 4 hr, 1inch strip 250 lbf @ Room Temp 125 lbf @ 160ºF | 5 cm Seam, 4 hr, 2.5 cm strip 1113 N @ Room Temp 556 N @ 71ºC |
| Abrasion Resistance ASTM D3389 H-22 wheel/1000g load | 10,000 cycles minimum before fabric exposure | 10,000 cycles minimum before fabric exposure |
| Permeability ASTM D814 (Fuel B) | 0.05 fl. oz/ft²/24 hr (max) | 15.9 mL/m²/24 hr (max) |