RU / EN
ĪST 54-3-175-72-99 with a change 1,2
SM-4,5 is mixture of aviation oils MS-8P and MS-20 in proportion 75:25 (wt. share, %)
The Characteristic
| Indicator name | Norm |
| The kinematic viscosity at 100°C, mm2/s, within | 4,3-4,7 |
| Flash point in closed crucible, °C, not below | 138 |
| Pour point, °C, not above | -35 |
| Thermal-oxidative stability at 130°C for 50 hours. |
|
| a) a kinematic viscosity at 100°C after oxidation, mm2/s, max | Not standardized The definition of necessarily |
| b) kinematic viscosity at minus 15°C, mm2/s, after oxidation, mm2/s, max | Not standardized The definition of necessarily |
| b) acid number after oxidation, mg KOH per 1 g of oil not more | Not standardized The definition of necessarily |
| d) mass fraction of the sludge after oxidation, %, not more | Not standardized The definition of necessarily |
| Warranty period of storage | 2 years |
The scope ofOil-mixture SM-4,5 is applied in airplanes with turboprop engines of AI-20 (airplanes An-12, Il-18) and AI-24 (an-24, An-26, An-30, An-32).