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| Polyester Short-cut Fiber（used in rubber） | ||||
| Number | Items | Premium-grade | 1st-grade | Eligible-grade |
| 1 | Tensile strength, Mpa ≥ | 580 | 540 | 500 |
| 2 | Melting point, ℃? | 250 | ||
| 3 | Breaking length, % | 23.0±8.0 | 23.0±9.0 | 23.0±10.0 |
| 4 | Diameter, μm | 11.0±4.0 | ||
| 5 | Appearance | White | ||
| 6 | Number of crimps, No./25mm | None | ||
| 7 | Dispersibility, No. ≤ | 25 | 50 | 80 |
used in rubber
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