Cosetex ushers in microfine silk
25/11/2025
Cosetex investigated the molecular structure of silk and applied its expertise to select specific ultrafine silks “capable of consistently achieving absolute fineness levels and more cohesive and soft structures,” Silvio Mandelli told Sportstextiles.
The ultra fine fibres were tested by Politecnico di Milano’s lab that found the silk fibres to demonstrate “characteristics in line with the most technical microfibers, while avoiding the major disadvantages of synthetic textile microfibers,” said Mr Mandelli. A synthetic fibre is considered a ‘microfibre’ when it measures less than 1 decitex. But silk yarns are traditionally measured in microns, which provides an indication of fineness, whereas one decitex represents the weight of one gramme of fibre.
“The convention in the textile industry is that natural fibres measuring under 10 microns are considered microfibres, but there is no official conversion rate from dtex to micronage. Silk can have a varied micronage that goes from 0.8 to 1.3,” he said.
Cosetex MicronSilk fibres are available in two forms: ultrafine mulberry silk fibres ranging from 8 to 11 microns and ultrafine wild tussah silk fibres ranging from 6 to 12 microns. They can thus be considered ‘natural microfibres’.
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