ISO 6185-4:2011规定了船体长度在8 m至24 m之间、电机额定功率为15 kW及以上的刚性充气船（肋骨）的设计、材料、制造和测试所需的最低安全特性。 适用于在-20°C至+60°C的工作温度范围内使用的IX和X型肋。 第九类:动力船，配备浮力管，覆盖至少85%的左右舷，适合在近岸和遮蔽水域航行，风力达6级波弗特，有效波高达2m（设计类别C和D），船体长度在8米到24米之间，电机额定功率在15千瓦及以上。 X型:动力船，装有浮力管，覆盖至少85%的左右舷，适合在风力达8波弗特、有效波高达4米（设计类别B）的水域航行，船体长度在8米至24米之间，电机额定功率为75千瓦及以上。 它排除了 单室船， 浮力小于1800 N的船只，以及 由浮力超过12 kN的无支撑材料制成的船，由功率超过4.5 kW的电机驱动。 它不适用于水上玩具，也不适用于ISO 9650中规定的充气救生筏。

ISO 6185-4:2011 specifies the minimum safety characteristics required for the design, materials, manufacture and testing of rigid inflatable boats (RIBs) with a hull length of between 8 m and 24 m and with a motor power rating of 15 kW and greater. It is applicable to Types IX and X of RIBs intended for use within the operating temperatures of -20 °C to +60 °C. Type IX: Powered boats, fitted with a buoyancy tube covering at least 85 % of the port and starboard sides, suitable for navigation in inshore and sheltered waters, up to and including wind force 6 Beaufort and significant wave heights up to 2 m (design categories C and D), with a hull length of between 8 m and 24 m and with a motor power rating of 15 kW and greater. Type X: Powered boats, fitted with a buoyancy tube covering at least 85 % of the port and starboard sides, suitable for navigation in waters, up to wind force 8 Beaufort and significant wave heights up to 4 m (design category B), with a hull length of between 8 m and 24 m and with a motor power rating of 75 kW and greater. It excludes single-chamber boats, boats of less than 1 800 N buoyancy, and boats made from unsupported materials of more than 12 kN inflated buoyancy and powered by motors of power exceeding 4,5 kW. It is not applicable to aquatic toys, nor to inflatable liferafts which are specified in ISO 9650.