Whereas NE-glass has lower contents of alkaline earth metals (such as CaO and MgO) than general-purpose E-glass used for composite materials, it has a higher content of boric acid (B2O3). As a result, its fiber has low dielectric constant and low dielectric dissipation factor although it has characteristics similar to those of E-glass. NE-glass is a new technology developed by Nittobo independently.
Characteristics
(Unit: wt %)
| Composition | NE-glass | E-glass |
|---|---|---|
| Density (g/cm3) *1 | 2.3 | 2.6 |
| Tensile strength (GPa) *2 | 3.1 | 3.2 |
| Tensile elasticity modulus (GPa) | 64 | 75 |
| Maximum elongation percentage (％) | 4.8 | 4.8 |
| Thermal expansion coefficient (×10-6/℃) *1 |
3.3 | 5.6 |
| Softening point (℃) *1 | - | 844 |
| Dielectric constant [1GHz] *1 | 4.8 | 6.8 |
| Dielectric dissipation factor [1GHz] | 0.0015 | 0.0035 |
*1 Measured values for lumps of glass
*2 Tensile strength is measured using glass fiber called “virgin fiber”, which has less defects.
* The data listed above are examples of actually measured values and not standard ones.