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| Facing Composition | Description | FSK60A Value (Metric) | FSK50B Value (Metric) | FSK50AR Value (Metric) |
| Foil | Aluminum | 7 micron | 7 micron | 7 micron |
| Reinforcing | Fiberglass | 8 /100mm- MD | 8 /100mm- MD | 8 / 100mm - MD |
| 12 /100mm- XD | 8 /100mm- MD | 12 / 100mm - XD | ||
| Adhesive | Polyethylene | -- | ||
| Kraft | Natural | 60gsm | 50gsm | 50gsm |
| Physical Property | Test Method | FSK60A Value (Metric) | FSK50B Value (Metric) | FSK50AR Value (Metric) |
| Basis Weight | Scale | 85 gsm | 85 gsm | 80 gsm |
| Permeance | ASTM E96 | 5.75 ng/N.s | 5.75 ng/N.s | 5.75 ng/N.s |
| Tensile Strength | ASTM D828 | 116 N/25mm- MD | 116 N/25mm- MD | 100 N/25mm- MD |
| 56 N/25mm- XD | 56 N/25mm- XD | 50 N/25mm - XD | ||
| Burst Strength | ASTM D774 | 30 N/cm2 | 30 N/cm2 | 30 N/cm2 |
| Temperature Resistance | ASTM C1263 -30 °C/+90 °C | Remains Flexible No Delamination | Remains Flexible No Delamination | Remains Flexible No Delamination |
| Dimensional Stability | ASTM D1204 @150F(65C) | Less than 0.5% | Less than 0.5% | Less than 0.5% |
| Emissivity | ASTM E408 | -- | -- | 0.03 |
| Fire Rating | BS 476 | -- | -- | Class 0 |
| Reflectivity of foil surface | BS 476 | 97% | 97% | -- |