Glass fibre yarns are made of E-glass with a thermal resistance of 600°C and HR-glass with a thermal resistance of 800°C, whereas twisted glass fiber yarns are made of both E-glass with a thermal resistance of 600°C and SiO2-glass with a thermal resistance of 1000+°C. Each glass type has its own properties, hence also application areas.
Yarn that consists of 400 to 1,600 whole glass fiber filaments (aka continuous fiberglass threads) is a simple textile product in which the yarns are bound with sizing and the first twist and has a broad application in weaving. The filament diameter is from 6 to 13 µm. The broad selection of yarn types and sizes makes it possible to use them in all various applications.
Twisted yarn is made of single yarn, twisting two or more yarns in the opposite direction and winding it on the bobbins. Technical specifications of twisted yarns are the same as those of single yarns. The twisting process provides for a yarn with a higher tex number and a higher twist, thus improving its technological properties for further textile processing: better tensile strength and friction resistance, better resistance to mechanical damages, etc.