Composition and Characteristics of Nittobo’s Glass Fiber
As the industry becomes increasingly diversified from day to day, such properties as higher strength and higher elasticity as well as lower dielectricity than before are required particularly for special uses, such as electronic materials. In order to meet such needs, Nittobo offers a full array of glass fiber products composed of various elements that have unique functions and features.
Characteristics
| General purposes | Special materials | ||
|---|---|---|---|
| E-glass | T-glass | NE-glass | |
| Density (g/cm3)*1 | 2.6 | 2.5 | 2.3 |
| Tensile strength (GPa)*2 | 3.2 | 4.8 | 3.1 |
| Tensile elasticity modulus (GPa) | 75 | 86 | 64 |
| Maximum elongation percentage (%) | 4.8 | 6.1 | 4.8 |
| Thermal expansion coefficient (x 10-6/℃)*1 | 5.6 | 2.8 | 3.3 |
| Softening point (℃)*1 | 844 | >1000 | - |
| Dielectric constant [1GHz]*1 | 6.8 | 5.4 | 4.8 |
| Dielectric dissipation factor [1GHz]*1 | 0.0035 | 0.0043 | 0.0015 |
| Characteristics | Electrical insulation | High tensile strength High tensile elasticity High heat resistance |
Low dielectric constant Low dielectric dissipation factor |
*1 Measured values for lumps of glass
*2 Measured using glass fiber called "virgin fiber", which has less defects. Values thus obtained indicate those close to an ideal level of strength.
* All data listed above are examples of actually measured values and not standard ones.
Composition
| General purposes | Special materials | |
|---|---|---|
| E-glass (%) | T-glass (%) | |
| SiO2 | 52～56 | 64～66 |
| Al2O3 | 12～16 | 24～26 |
| CaO | 20～25 | - |
| MgO | 9～11 | |
| R2O | 0～0.8 | - |
| B2O3 | 5～10 | - |
| ZnO | - | - |
The components listed above are expressed as oxide composition formulas, in accordance with technical convention in the field of glass science. However, they do not exist within E-glass as a simple mixture of discrete oxides; rather, the constituent oxides are chemically bonded together to form an irregular, interconnected network (lattice) structure. Therefore, these oxide-based representations are merely a matter of conventional notation and do not reflect the actual state of these components within the glass.