Brick Dimensions (L x W x H mm): 215x102x65 Size Tolerances Mean & Range: Tm Rm Configuration: Solid Voids (%): 0 Compressive Strength (N/mm²): 20 Active Soluble Salts: S2 Water Absorption (% weight): 12 Durability: F2 Gross Dry Density (Sound Insulation) (Kg/m³): 1740 Ibstock 65mm Birtley Olde English clay facing brick