VNII NP-242All-Union State Standard 20421-75VNII NP-242 is anti-frictional grease that is intended for rolling bearings of ship electric machines operating at temperatures from minus 40 ° C up to 110 ° C at ambient humidity up to 98%.Guarantee period of storage – 5 years from the day of manufacture.Table127
| Index name |
VNII NP-242 |
| Appearance |
Homogeneous soft ointment of black colour |
| Efficient viscosity, Pа•s, not less than : |
|
| - at 0°С and at the average gradient of the strain rate of 10 s−1, not more than −1 |
500 |
| - at minus 20°С and at the average gradient of the strain rate of 10 s−1, not more than |
1800 |
| Proof strength at 80°С, Pа, not less than |
100 |
| Colloid stability, % of the secreted oil, not more than |
10 |
| Corrosive influence on metals |
Withstands |
| Fraction of total mass: |
|
| - Water, %, not more than |
None |
| - free alkali re-calculated into NaOH, %, not more than |
0,15 |
Evaporation at 120°С within 1hour , %,
not more than |
2,0 |
|
