Basic Definition of ETX2250
ETX2250 is fine-twisted yarn made of E-grade alkali-free electronic glass fiber, with a linear density of 2250 tex (2250 grams per kilometer). It is commonly referred to as 2250 electronic glass fiber yarn in the industry, specially developed for weaving PCB copper-clad laminates and electronic insulating fabrics.
Spooled ETX Glass Fiber Yarn
Raw Electronic Glass Fiber Yarn
Core Basic Parameters
Glass type: E alkali-free glass, featuring electrical insulation and zero alkali leaching
Filament diameter: Ultra-fine 4 μm raw filaments
Twist direction / twist count: Standard low-balanced twist of 1.0Z with even yarn evenness
Sizing agent: Special silane type (compatible with epoxy resin), no high-temperature desizing required
Moisture content: ≤0.2%; sizing agent content: 0.3–0.8%
Stable tensile strength, extremely low fuzziness and minimal static electricity
2. Core Advantages of ETX2250
1. Premium Electrical Insulation (Core Advantage for Electronics Industry)
It delivers an ultra-low dielectric constant and low dielectric loss, suited for high-frequency high-speed PCBs used in 5G and AI servers, ensuring low signal delay and stable transmission. Its alkali-free formula prevents ion precipitation under prolonged high temperatures, eliminating circuit board electric leakage and copper foil corrosion to maximize the reliability of copper-clad laminates. Boasting high breakdown voltage, it meets insulation safety standards for high-voltage electrical control, vehicle BMS and industrial control boards.
2. Superior Mechanical Properties & Weaving Performance
Its specific strength far exceeds steel while enabling lightweight and deformation-free application. Fabrics woven from it show zero dimensional shrinkage under heat and humidity, preventing PCB warpage during lamination and maintaining stable dimensional tolerances. The ultra-fine 4 μm filaments paired with precise low twist reduce breakage during weaving and yield smooth, delicate fabric surfaces. It serves as a primary raw material for mainstream ultra-thin electronic fabrics (106, 2116, 7628). It has excellent strand cohesion and negligible lint, cutting weaving dust and equipment wear, with a higher yield rate than conventional thick-count glass fiber yarns.
3. Excellent Resin Wetting & Easy Processing
The silane sizing agent creates strong interfacial adhesion with epoxy and phenolic resins, accelerating resin penetration to produce bubble-free, delamination-free laminates. A heat-cleaning-free process eliminates high-temperature desizing steps, lowering factory energy consumption, shortening lead times and cutting production costs. With good flexibility, it supports multiple processes including weaving thin insulating fabrics, winding insulating sleeves and manufacturing copper-clad substrates.
4. Long-Term Stability with Weather & Corrosion Resistance
As an inorganic material, it resists mildew, aging, as well as acid, alkali and salt corrosion, offering long service life in harsh outdoor, automotive and industrial control environments. It withstands continuous operating temperatures up to 280°C and short-term peaks of 350°C without softening or deformation, remaining undamaged under soldering heat and reflow soldering conditions. Non-absorbent with ultra-low moisture absorption, its insulation performance does not degrade in humid environments.
