Fiber Grade Reference
Application & material guidance
Fiber Grade Reference
Use the complete grade name and brochure edition when comparing continuous alumina fibers.
Current M-series selection
The 2026 brochure lists M-735, M-857, M-996 and M-75M. Their individual product pages contain the stated composition and mechanical data. M-75M has inconsistent naming between the English and Chinese editions; confirm its designation with the current technical data sheet.
Earlier F/P/C/M series
The English Alumina Fiber brochure contains the following separate reference table. These names and values are retained for identifying earlier inquiries and are not substitutions for the newer M-series.
| Grade | Composition | Melting point (°C) | Continuous use (°C) | Filament diameter (µm) | Tex / filament count | Crystal phase | Density (g/cm³) | Single-filament strength (GPa) | Modulus (GPa) |
|---|---|---|---|---|---|---|---|---|---|
| F-72 | 72% Al₂O₃ / 28% SiO₂ | 1800 | 1200 | 7–10 | 60–90/400; 100/500 | γ-Al₂O₃ | 2.9 | 1.9 | 184 |
| P-80 | 80% Al₂O₃ / 20% SiO₂ | 1850 | 1250 | 10–12 | 115/500 | γ/δ-Al₂O₃ + mullite | 3.0 | 2.0 | 215 |
| C-85 | 85% Al₂O₃ / 15% SiO₂ | 1850 | 1300 | 10–12 | 150/500 | α-Al₂O₃ + mullite | 3.1 | 2.2 | 235 |
| M-99 | >99% Al₂O₃ | 2050 | 1000 | 12–14 | 160/750; 140/400 | α-Al₂O₃ | 3.5 | 2.6 | 330 |
Compare like-for-like measurements
The earlier table specifies a 25.4 mm gauge length for single-filament tensile strength. Yarn tenacity in N/tex, bundle strength and single-filament tensile strength are different quantities. Melting point, temperature classification and continuous operating temperature are also distinct.
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