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Brunel Smooth Blue Solid Class B Engineering Brick 65mm is used for heavy engineering projects and below DPC works due to its durability. Class B engineering bricks have a compressive strength greater than 75N/mm² and water absorption less than 7%. Ideal for applications that require a high strength solution. They have a low rate of water absorption, and can be used above or below ground. Suitable wherever strength and low levels of water absorption are important, for example foundation and drainage work.