Rayeburn Jacobite red multi brick measuring 215 x 102.5 x 65mm. Size Tolerance Mean & Range : T2 & R1. Compressive Strength : ≥ 55 N/mm2. Water Absortion : ≤ 7%. Configuration : Vertically Perforated. Gross Dry Density : 1660 kg/m3. Durability : F2. Active Soluble Salts : S2.