Las fibras de acero 4D que se utilizan para el hormigón armado.
| Tensile strength | 1,800 N/mm2 | |
| Length | ![]() | 60mm |
| Diameter | ![]() | 0.75 mm |
| Hook shape | ![]() | 4D |
| Aspect ratio | ![]() | 80 |
| Young's Modulus | 200,000 N/ mm2 | |
| Density | 7,850 Kg/m3 | |
| Network | 4,600 fibres/kg | |
| Minimum dosage | 10 kg/m3 | |

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