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Technical data
| Protech GM HM Properties | Result |
| Roll Length: | 4m |
| Width: | 12.5m |
| Thickness: | 1.0mm |
| Density: | 0.94g/m³ |
| Colour: | Black |
| Tensile Strength @ Break (ASTM D638): | 20N/mm2 |
| Elongation 2 Break (ASTM D638): | >700% |
| Puncture Resistance: | 240N |
| Tear Resistance: | 93N |
| Moisture Vapour Permeability: | <0.1 g/m²/day |
| Methane Permeability: | <0.11 g/m²/24h/atm |
| Petrol Vapour Transmission Rate: | <1.06 g/m²/h |
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