Wienerberger Engineering Blue Solid Class B Brick. The product contains a high quality performing facing engineering brick, selected for its technical properties. Can be used below DPC and has a low salt content - S2. It?s made from a smooth blue textured clay with a Wirecut process makes manufacturing easier and cost effective. The bricks have a precise square edge, whilst meeting the defined limits necessary for a compressive strength of 75N/mm2 and 7% water absorption. Dense and semi vitreous body can help the product withstand severe exposure to different weather conditions for example being frost resistant. A durability rating of F2 and is fire resistance. 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.