flame had self-extinguished, the propagation of the flame was measured from the edge of the metal frame. The criterion for a passing test is that the flame must self-extinguish before reaching 1-inch (2.5-cm) from the frame in seven out of the eight samples tested. The CEST passed this flammability test. Example CEST project installations Numerous CEST system projec ts have been installed throughout North America, with a combined total area of more than 3,000,000 square feet (280,000 m2). The CEST has been used to armor dams and levees, steep downchutes, channels, outfall structures and shorelines. Examples of these applications are described in this section. FIGURE 3 CEST turf yarns: Retained tensile strength vs. weathering time Welding and testing equipment for the serious geosynthetics installer Pro-Wedge VM-20 Wedge Welder Over 6,000 units sold! Pro-Tester High-Pull Tensiometer for testing high-strength materials with new Auto-Engage feature (888) 324-WELD (9353) or 530 621-3200 Visit demtech.com or call for more product information. www.GeosyntheticsMagazine.com 17http://www.demtech.com http://www.GeosyntheticsMagazine.com