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Threshold time for basalt fabrics and composites
| Sample | tt, s * | Efficiency level | Sample | tt, s * | Efficiency level | ||
|---|---|---|---|---|---|---|---|
| 1 | B1 | 3.9 (0.3) | - | 5 | BP1 | 4.5 (0.2) | - |
| 2 | B2 | 4.3 (0.8) | -/F1 | 6 | BP2 | 4.7 (0.2) | - |
| 3 | B3 | 4.4 (0.3) | - | 7 | BP3 | 6.7 (1.1) | F1 |
| 4 | B4 | 4.5 (0.5) | - | 8 | BP4 | 9.7 (0.6) | F1 |
Radiant heat transfer index for basalt fabrics and composites
| Sample | RHTI24, s * | Efficiency level | Sample | RHTI24, s * | Efficiency level | ||
|---|---|---|---|---|---|---|---|
| 1 | B1 | 12.6 (0.3) | C1 | 5 | BP1 | 12.4 (0.4) | C1 |
| 2 | B2 | 12.6 (0.3) | C1 | 6 | BP2 | 12.9 (0.4) | C1 |
| 3 | B3 | 12.4 (0.3) | C1 | 7 | BP3 | 12.8 (0.4) | C1 |
| 4 | B4 | 12.9 (0.3) | C1 | 8 | BP4 | 12.8 (0.9) | C1 |
Color measurements results
| Sample | L1* | a1* | b1* | Sample | L1* | a1* | b1* | ΔE00 |
|---|---|---|---|---|---|---|---|---|
| B1 | 51.02 | 3.76 | 8.96 | BP1 | 52.06 | 3.20 | 9.19 | 1.67 |
| B2 | 47.42 | 2.94 | 8.53 | BP2 | 47.81 | 3.02 | 8.17 | 1.67 |
| B3 | 51.27 | 3.12 | 9.37 | BP3 | 50.89 | 3.17 | 8.75 | 1.67 |
| B4 | 48.18 | 2.97 | 8.76 | BP4 | 49.72 | 3.08 | 8.80 | 1.67 |
Basalt fabric parameters (mean value with a variation coefficient)
| Sample | Weave | Linear mass of warp/weft, tex | Warp density, threads·cm-1 | Weft density, threads·cm-1 | Thickness, mm | Areal density, g·m-2 | Bulk density, kg·m-3 |
|---|---|---|---|---|---|---|---|
| B1 | Plain | 138 | 11 | 9 | 0.480 (4%) | 284 (6%) | 592 |
| B2 | Plain | 293 | 9 | 8 | 0.552 (5%) | 391 (7%) | 711 |
| B3 | Plain | 189 | 11 | 9 | 0.582 (3%) | 430 (8%) | 741 |
| B4 | Twill | 296 | 9 | 6 | 0.802 (4%) | 731 (5%) | 914 |
Structural parameters of composites determined using micro-CT
| Geometrical parameter | Composite | |||
|---|---|---|---|---|
| BP1 | BP2 | BP3 | BP4 | |
| Total porosity, % | 41.86 | 46.62 | 60.29 | 47.89 |
| Yarn porosity (weft), % | 35.61 | 32.91 | 30.34 | 39.57 |
| Yarn porosity (warp), % | 22.61 | 31.14 | 31.25 | 35.41 |
| Weft density, cm-1 | 9.3 | 8.4 | 8.9 | 6.6 |
| Warp density, cm-1 | 11.4 | 9.2 | 11.3 | 9.6 |
| Density of yarns, cm-2 | 106 | 77 | 101 | 63 |
| Major axis of elliptic yarn cross-section (weft), awe, mm | 0.767 | 0.771 | 0.644 | 1.089 |
| Minor axis of elliptic yarn cross-section (weft), bwe, mm | 0.177 | 0.156 | 0.235 | 0.295 |
| Weft flattering coefficient, ewe = bwe·awe-1 | 0.231 | 0.202 | 0.365 | 0.271 |
| Major axis of elliptic yarn cross-section (warp), awa, mm | 0.838 | 0.855 | 0.820 | 1.168 |
| Minor axis of elliptic yarn cross-section (warp), bwa, mm | 0.134 | 0.311 | 0.174 | 0.306 |
| Warp flattering coefficient, ewa = bwa·awa-1 | 0.160 | 0.364 | 0.212 | 0.262 |