A WIDE RANGE OF DRAINAGE SOLUTIONS FROM A15 TO F900. ULMA offers a wide range of polymer concrete channels that meet the standard EN 1433 and are available in load classes ranging from A15 to F900. ULMA’s drainage channels and accessories are suitable for use in a variety of settings, including industrial, commercial, road, and domestic applications. ULMA’s drainage channel systems are designed with a technical sales approach, providing excellent value to its clients.