... ageing(80±2) °C,24h,≤1.5%(80±2) °C,24h,≤1.0%(80±2) °C,(1344±1)h≤0.5%(80±2 ... ) °C,(1344±1)h≤0.5%≤0 ... ≥75% or failure of rollThe roll breaks beyond joint7Absorbent—(70±1) °C,168±1h, ±3.0%(23±2) °C,168±1h ... resistance0.5Kg,300mm No water penetration0.5Kg, (23±1) °CNo water penetration0.5Kg, (23±1) °CNo water penetration9Speed-up ageing treatment under ...