Strength ratings from 500 kN/m through to 6300 kN/m. Protection to the cords is achieved by hard wearing rubber covers of variable thickness from 4 mm to 40 mm to suit the application. The rubber covers are also available in a wide range of compound formulations to enhance service life or provide special properties. This construction provides the highest possible strength with lowest elongation suited to conveying bulk materials of all types over extremely long distances. It can be joined endless by a hot vulcanising process. The proprietary splice designs provided by Dunlop aim to achieve a join strength greater than the belt itself and should last the lifetime of the belt.