H+H Celcon Hi-7 Aerated Concrete Block 7.3N is available from us in different thicknesses. Designed in a grey coloured concrete block. These blocks are part of the High Strength grade (recently renamed from Hi-7). Used ideally where higher compressive strengths are needed for example building foundations or lower storeys of three storey buildings. They can be used for internal or external cavity walls, solid walls, separating walls, flanking walls and partitions. Blocks are specifically designed for Class A1 fire rating with the thermal conductivity at 0.18W/mK. For a lower strength grade of concrete block, see Celcon Standard Aerated Concrete Block 3.6N. For any further information or guidance, please contact our team on 01628 674910. PLEASE NOTE: The image is for representative purposes only, if unsure please order a sample Due to the Covid-19 pandemic, brick manufacturers have seen a surge in demand which has led to stock shortages and extended lead times. The price set against the product is based on them being in stock and delivered out of selected depots. We will always try to make sure that our customers' orders are fulfilled, but in the event we cannot supply the bricks within our selected network we will offer an alternative solution where possible.