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Description Ibstock Blue Perforated Class B Engineering Brick is sold for its performance and not colour qualities. Its manufacturing process includes wirecut and is an extruded brick in the colour blue with a smooth texture. As an engineering brick, the Class Blue Perforated has low absorption and high compressive strength means it is usually chosen for structural engineering situations such as ground works, sewers, manholes, retaining walls and damp proof courses. PLEASE NOTE: The image is for representative purposes only, if unsure please order a sample Delivery conditions apply, see delivery tab for more details.