Polymers such as aramids or the thermotropic polyesters that form liquid crystals when in the appropriate state, (concentrated solution or melt). Most liquid crystal polymers have in their structure a succession of para-ring structures. The liquid crystal formation is thought to relate to the fact that there is a limiting concentration of rod-like chains that can exist in a random arrangement in a solution or melt. Once this concentration is reached, ordering or alignment of the chains in necessary to accommodate them. fibres from liquid crystal polymers generally have high modulus and tenacity, good chemical resistance, and high-temperature resistance. They are used in a wide range of applications including protective apparel, tyre cord, composites, ropes and cables, etc.