Research of influence of natural insulation on the mechanical characteristics of sewing threads made from para-aramide fibres

The research of change in time of mechanical characteristics of sewing threads from para-aramide fibres applied by manufacturing of special protective clothes for firemen is conducted. It is established, that under influence of natural insolation during twelve weeks the strength of sewing threads from the para-aramide fibres decreases by 65.9 %. The greatest loss of strength is observed during first six weeks and makes 42.7 %. The work results enable for develop recommendations and determine the storage conditions that have the practical importance for sewing industry and for the organization of the Ministry of Emergency Measures.