China    YF-2     Propellant: Thrust: 31,213 kgf (sl) Burn time: 130 s Specific impulse: 241 s (v) Specific impulse: 268 s (sl) Vehicles: CZ-1 (1 st.) First flight: 1969    YF-20     Propellant: Chamber pressure: 70 atm Thrust: 76,499 kgf (sl) Burn time: 132 s Specific impulse: 289 s (v) Specific impulse: 259 s (sl) Vehicles: FB-1, CZ-2A (1 st.) First flight: 1972    YF-21 (4 x YF-20)    YF-20A     Propellant: Chamber pressure: 70 atm Thrust: 76,499 kgf (sl) Burn time: 132 s Specific impulse: 289 s (v) Specific impulse: 259 s (sl) Vehicles: CZ-2C / 3 (1 st.) First flight: 1982    YF-21A (4 x YF-20A)    YF-20B     Propellant: Chamber pressure: 70 atm Thrust: 83,239 kgf (sl) Burn time: 170 s Specific impulse: 289 s (v) Specific impulse: 259 s (sl) Vehicles: CZ-2D / 2E / 2F / 3A / 4 / 4B (1 st.) First flight: 1988    YF-21B (4 x YF-20B)    YF-20C / YF-25     Propellant: Chamber pressure: 70 atm Thrust: 80,292 kgf (sl) Specific impulse: 297 s (v) Specific impulse: 260 s (sl) Vehicles: CZ-3B / 3C / 4C (1 st.) First flight: 1999    21C (4 x YF-20C)    YF-22 / 22A / 22B     Propellant: Thrust: 73,195kgf (sl) Specific impulse: 295  s (v) Specific impulse: 260 s (sl) Vehicles: FB-1, CZ-2A / 2C / 2D / 2E / 2F / 2G , CZ-3 / 3A, CZ-4 / 4B (2 st.) First flight: 1999    YF-24 / 24A / 24B YF-24  YF-24A  YF-24B  (YF-22 (YF-22A (YF-22B  + 4 x YF-23) + 4 x YF-23) + 4 x YF-23)    YF-22E     Propellant: Thrust: 80,292 kgf (sl) Burn time: 170 s Specific impulse: 297 s (v) Specific impulse: 260 s (sl) Vehicles: CZ-3B / 3C / 4C (2 st.) First flight: 1999    YF-24D / 24E YF-24D  YF-24E  YF-22E (YF-22E  + 4 x YF-23B) + 4 x YF-23F)    YF-40     Propellant: Chamber pressure: 44 atm Thrust: 10,003 kgf (v) Specific impulse: 303 s (v) Specific impulse: 297 s (sl) Vehicles: CZ-4 (2 st.) First flight: 1999    YF-50     Propellant: Thrust: 49 kgf (v) Specific impulse: ? (v) Vehicles: Satellites, Space Tugs    YF-50D     Propellant: Thrust: 255 kgf (sl) Specific impulse: 219 s (v) Vehicles: Shenzou, Tiangong, Tianzhou, CMS    YF-100     Propellant: Chamber pressure: 175 atm Thrust: 124,762 kgf (v) Thrust: 139,395 kgf (sl) Specific impulse: 335 s (v) Specific impulse: 300 s (sl) Vehicles: CZ-5 / 6 / 7 (1 st.) First flight: 2016    YF-100GBI Vehicles: CZ-6 First flight: 2015    YF-100F    YF-100K     Propellant: Chamber pressure: 178 atm Thrust: 140,312 kgf (v) Thrust: 125,527 kgf (sl) Specific impulse: 337 s (v) Specific impulse: 302 s (sl) Vehicles: CZ-5 (1 st.)    YF-115     Propellant: Chamber pressure: 118 atm Thrust: 17,997 kgf (v) Burn time: 341 s Specific impulse: 342 s (v) Specific impulse: 294 s (sl) Vehicles: CZ-6 / 7 (2 st.) First flight: 2015    YF-73     Propellant: O2 / H2 Chamber pressure: 26 atm Thrust: 4,502 (v) Specific impulse: 420 (v) Vehicles: CZ-3 (3 st.) First flight: 1984       YF-75     Propellant: O2 / H2 Chamber pressure: 37 atm Thrust: 15,999 (v) Specific impulse: 437 (v) Vehicles: CZ-3A / B / C (3 st.) First flight: 1994       YF-77     Propellant: O2 / H2 Chamber pressure: 100 atm Thrust: 52,821 (v) Thrust: 71,380 (sl) Specific impulse: 428 (v) Specific impulse: 312 (sl) Vehicles: CZ-5 (1 st.) First flight: 2016