The NDl symmetrical chemical structure leads to its excellent mechanical properties. The elastomer made of NDl has excellent heat resistance due to the high polarity of the rigid chain, pertect molecular symmetry, and unique structure of itself Ultrallan* futures excellent properties in all aspects such as heat resistance of 100°C and 150° for short term, bearing capacity, energy storage capacity, cut-resistance, wear resistance, shock resistance at low emperature integrity at brittle temperature of -65C, solvent resistance, oil resistance, weather resistance and aging resistance