VNII NP-231 is a silicone fluid thickened with DG-100 carbon.
The heat-resistant VNII NP-231 grease is used for lubrication of enclosed worm-screw mechanisms, slow-speed roller and friction-type bearings within the temperature range from -60°C to +250°C and at the residual pressure of 666.5 Pa.
|Drop point, °C, min.||-|
|Penetration at 25°C, 0,1 mm||310-340|
|Point of break at 20°C, Pa||250-450|
|Viscosity at 0°C and rate of deformation average gradient 10s-1, Pa•s, max.||50-75|
|Colloid stability, %, max.||8|