ECG Fiberglass Yarn
Electrical Insulation Grade | Sleeving · Tapes · Fire Protection
ECG Fiberglass Yarn
ECG (Electrical Continuous Glass) fiberglass yarn is a precision-twisted or assembled yarn produced from ultra-fine E-glass filaments, wound onto parallel or taper-wound bobbins for weaving, braiding, knitting or wrapping operations. The very fine filament diameter (typically 5–9 µm) imparts excellent flexibility, smooth surface texture and outstanding electrical insulation properties. Our ECG yarns meet the demanding requirements of the electrical insulation, fire protection and high-temperature textile industries.
Key Features
- Ultra-fine filament diameter (5–9 µm) for excellent flexibility and drape
- Outstanding electrical insulation — high dielectric strength and low loss factor
- Continuous service temperature up to 550°C for E-glass based products
- Non-combustible — does not support flame propagation
- High tensile strength for yarn diameter — excellent weave coverage
- Precision-wound bobbins for consistent tension and creel performance
- Compatible with varnish, silicone and rubber coating systems
About ECG Fiberglass Yarn
Fiberglass yarn has been the material of choice for electrical insulation in medium and high-voltage applications since the 1950s. Unlike organic yarns such as cotton, polyester or nylon, fiberglass is inorganic, non-combustible and chemically stable. It does not absorb moisture, does not carbonise under electrical arcing, and retains its structural integrity at temperatures where organic insulation systems have long since failed.
ECG yarns are produced by gathering 200–400 individual filaments (each 5–9 µm in diameter) into a bundle, then applying a twist (typically 0–2 turns per cm for weaving grades, up to 5 tpc for braiding grades) to provide cohesion. The surface is treated with a silane or starch/oil sizing compatible with the intended coating system — varnish, resin impregnation, silicone rubber or PTFE, for example.
We stock ECG yarns in a range of tex values from EC9 (fine, high-count weaving) to EC12 and EC14 (medium tex, suitable for braiding and sleeving), wound on standard parallel bobbins for creel feeding or on taper-wound packages for single-end braiding machines.
Note: We supply multiple grades and qualities to match your application — share your requirements and we will recommend the right product.