 Gwrhyd’s Blue pennant sandstone is one of the strongest available in the UK. Its technical properties are far superior to other sources of pennant and allow it to be either used in thinner thicknesses compared to other stones or to carry higher loads.
For instance a 400x900mm flag at 50mm think in Gwrhyd Pennant will carry a class 5 loading as shown in the table below whereas a normal pennant will only carry class 2.
| Class |
Min Breaking Load kN |
Typical Use |
| 0 |
0 |
Decoration |
| 1 |
0.75 |
Slabs bedded on mortar, pedestrian only. |
| 2 |
3.5 |
Pedestrian and cycle areas. Garden Balconies. |
| 3 |
6 |
Occasional car, light vehicle and motorcycle access. Garage entrances |
| 4 |
9 |
Walking areas, market places occasionally used by delivery vehicles. |
| 5 |
14 |
Pedestrian areas often used by heavy vehicles. |
| 6 |
25 |
Roads and streets, petrol stations. |
 All of our products are produced in accordance with the British Standards so that the quality of the stone is assured. We are BSI accredited for ISO 9001, 14001 & 18001 and pass 99.
Gwrhyd pennant and Marshalls other stones are rigorously tested to British Standards. This includes durability tests such as freeze thaw and flexural tests after freeze action. Beyond this our products are also tested for other durability indicators not covered in the British Standards such as polished paver test vales. This gives security that the product will be sound during service.
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