| FIRE RESISTANCE | 3 SIDES EXPOSED | 4 SIDES EXPOSED | ||||
|---|---|---|---|---|---|---|
| HP/A | Thickness (MM) | L/M² | HP/A | Thickness (MM) | L/M² | |
| 30 minutes | 245 | 0.404 | 0.58 | 320 | 0.366 | 0.53 |
| 250 | 0.41 | 0.59 | ||||
| 255 | 0.416 | 0.60 | ||||
| 260 | 0.423 | 0.61 | ||||
| 265 | 0.429 | 0.62 | ||||
| 270 | 0.435 | 0.63 | ||||
| 275 | 0.442 | 0.64 | ||||
| 280 | 0.448 | 0.65 | ||||
| 285 | 0.455 | 0.66 | ||||
| 290 | 0.461 | 0.66 | ||||
| 295 | 0.467 | 0.67 | ||||
| 300 | 0.474 | 0.68 | ||||
| 305 | 0.48 | 0.69 | ||||
| 310 | 0.486 | 0.70 | ||||
| 315 | 0.493 | 0.71 | ||||
| 320 | 0.499 | 0.72 | ||||
| 60 minutes | 130 | 0.401 | 0.58 | 82 | 0.392 | 0.56 |
| 135 | 0.431 | 0.62 | 85 | 0.424 | 0.61 | |
| 140 | 0.46 | 0.66 | 92 | 0.5 | 0.72 | |
| 145 | 0.49 | 0.71 | 95 | 0.532 | 0.77 | |
| 150 | 0.52 | 0.75 | 100 | 0.587 | 0.85 | |
| 155 | 0.549 | 0.79 | 105 | 0.641 | 0.92 | |
| 160 | 0.579 | 0.83 | 110 | 0.695 | 1.00 | |
| 165 | 0.62 | 0.89 | 115 | 0.749 | 1.08 | |
| 170 | 0.636 | 0.92 | 120 | 0.803 | 1.16 | |
| 175 | 0.661 | 0.95 | 125 | 0.857 | 1.23 | |
| 180 | 0.687 | 0.99 | 130 | 0.912 | 1.31 | |
| 185 | 0.713 | 1.03 | 135 | 0.966 | 1.39 | |
| 190 | 0.739 | 1.06 | 140 | 1.02 | 1.47 | |
| 195 | 0.765 | 1.10 | 145 | 1.074 | 1.55 | |
| 200 | 0.791 | 1.14 | 150 | 1.128 | 1.62 | |
| 205 | 0.817 | 1.18 | 155 | 1.182 | 1.70 | |
| 210 | 0.843 | 1.21 | 160 | 1.237 | 1.78 | |
| 215 | 0.869 | 1.25 | 165 | 1.291 | 1.86 | |
| 220 | 0.895 | 1.29 | 170 | 1.345 | 1.94 | |
| 225 | 0.92 | 1.32 | 175 | 1.399 | 2.01 | |
| 230 | 0.946 | 1.36 | 180 | 1.453 | 2.09 | |
| 235 | 0.972 | 1.40 | 185 | 1.507 | 2.17 | |
| 240 | 0.998 | 1.44 | 188 | 1.54 | 2.22 | |
| 245 | 1.024 | 1.47 | 195 | 1.557 | 2.24 | |
| 250 | 1.05 | 1.51 | 200 | 1.569 | 2.26 | |
| 255 | 1.081 | 1.56 | 205 | 1.582 | 2.28 | |
| 260 | 1.113 | 1.60 | 210 | 1.594 | 2.30 | |
| 265 | 1.144 | 1.65 | 215 | 1.606 | 2.31 | |
| 270 | 1.176 | 1.69 | 220 | 1.619 | 2.33 | |
| 275 | 1.207 | 1.74 | 225 | 1.631 | 2.35 | |
| 280 | 1.239 | 1.78 | 230 | 1.643 | 2.37 | |
| 285 | 1.27 | 1.83 | 235 | 1.655 | 2.38 | |
| 290 | 1.301 | 1.87 | 240 | 1.668 | 2.40 | |
| 295 | 1.333 | 1.92 | 245 | 1.68 | 2.42 | |
| 300 | 1.364 | 1.96 | 250 | 1.692 | 2.44 | |
| 305 | 1.396 | 2.01 | 255 | 1.704 | 2.45 | |