Biodegradable Top-of-Rail Friction Modifier - TOR Armor® is a revolutionary top of rail friction modifier specifically designed to provide a friction coefficient between 0.3 and 0.4 at the wheel-rail interface. TOR Armor substantially reduces noise, wear, and lateral forces. High lateral forces lead to loosened tie plates and fasteners, and can result in low rail rollover.
During normal rolling, TOR Armor acts as a lubricant. But when wheel creep occurs the sliding friction immediately converts to “positive friction”, controlling the creep condition and returning the wheels to a healthy rolling motion. The result is a substantial reduction of vibrations, corrugations and high-frequency squealing.
The positive friction generated by TOR Armor reduces lateral creep, thus reducing lateral forces. This has been measured on instrumented track at TTCI and Class 1 and 2 railways.
TOR Armor offers a year-round solution by using regular TOR Armor in hot to moderate climates and adding TOR Armor Artic in areas where temperatures dip below 10°F (-12°C) for extended periods of time. Both grades of TOR Armor are fully compatible and can be mixed in trackside applicators without changes to the performance characteristics other than the low temperature usage.
TOR Armor contains no solvents, latex or toxic materials. It dries quickly between the wheel and the rail due to frictional heat, but it will not harden in the holding tank or at the ports of the applicator. It will not corrode holding tanks, pumps or other steel components. The carry-down distance will depend on conditions such as curvature, braking and gradient, but 3 miles (5 km) is achievable in the vast majority of cases. In some cases, reductions in lateral forces have been measured at 6 miles from the applicator. The long carry distance often results in a reduction in the number of applicators needed.
TOR Armor does not affect braking or tractive effort.