Brightness: Min.75% (ISO 2470)(STN ISO 3688) Sheet size: 600mm x 800mm Dirt content: max.150(0.3-5.0 mm2) Breaking Length: 5.0km Average Length of Fiber: 0.85 mm pH(10% suspension): 6.5-7.5 (ISO 6588) Moisture: max. 12% (ISO 287)(STN 500207) Sulfate ashes(800°+/-25?): max. 2% (ISO 1762)