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Fiberglass Pultruded Flat Bar (Pultruded Bar). High Strength: Stronger than structural steel on a pound-for-pound basis. Light Weight: 20-25% the weight of steel and 70% the weight of aluminum. Anti-Corrosion: Impervious to corrosive elements; will not rot. Electro-Magnetic Transparency: Transparent to radio waves and microwaves; ideal for antennas. Non-Conductive: Low thermal and electrical conductivity. Custom Colors: Pigmented throughout thickness; virtually any custom color available. Custom Shapes: Customer designed profiles and special shapes are available. Dimensional Stability: Thermal expansion coefficient is slightly less than steel.