Rheotemp™ 600
Sophisticated mechanical designs demand superior performance from their bearings. The reliability of these bearings is often safety-critical and great care should be taken to protect them from wear. General purpose lubricants will not adequately protect bearings exposed to extreme service conditions like high speeds, high and low temperatures, and harsh environments.
Rheotemp™ 600, Nye’s next-generation wide-temperature bearing grease, is intended for high-speed bearings exposed to extreme service conditions such as those within the aviation, automotive, trucking, and power and utility industries.
Nye completed extensive testing to formulate a wide-temperature grease that offers additional protection against low temperatures, fretting wear, oxidation, and saltwater corrosion to extend bearing life.
Engineers are being required to design applications to lower temperature specifications. Lubricants must be able to withstand low temperatures without negatively effecting start-up or running torque. Rheotemp™ 600 generates low starting and running torque.
| Product | Conditions ASTM D478 | Starting Torque | Running Torque (60 mins) |
|---|---|---|---|
| RHEOTEMP 600 | 1 RPM, -54°C | 0.66 Nm | 0.09 Nm |
Bearings exposed to extreme service conditions, like water intrusion or salt corrosion, must offer superior water resistance to ensure the bearing remains lubricated and protected against rust. The results below indicate the amount of lubricant that washes away when exposed to water. Rheotemp™ 600 offers excellent water resistance.
Rheotemp™ also protects against rust and salt corrosion. When exposed to 3% synthetic sea water for one week under both dynamic and static conditions, Rheotemp™ 600 exhibited no corrosion per ASTM D6138.
| Product | Conditions ASTM D1264 | Mass Loss |
|---|---|---|
| RHEOTEMP 600 | 600 rpm, 1 hr, 5mL water/sec, 41°C | 3.74% |
When oil separates from grease in high-temperature bearing applications, the grease can dry out and harden. This creates insufficient lubrication conditions that increase bearing temperatures, increase wear, and accelerate the need for relubrication. Per ASTM D6184, higher weight loss is a direct indicator of increased oil separation. Rheotemp™ 600 exhibits minimal oil separation making it extremely shear stable.
| Product | Conditions ASTM D6184 | Weight Loss |
|---|---|---|
| RHEOTEMP 600 | 30 hrs, 177°C | 1.7% |
When bearings remain stationary for extended periods of time, they are exposed to micromotions that lead to fretting wear. This can remove existing lubrication and wear down the bearing, leading to component failure. Once the bearing is actuated, it may cause operational and/or safety problems.
| Product | Conditions ASTM D4170 | Bearing Race Mass Loss |
|---|---|---|
| RHEOTEMP 600 | 30Hz, 2450N, 22 hrs | 0.5 mg |
For example, cars are prone to fretting wear even before they arrive at the dealership when they are transported from the factory by railcar. These bearings may be stationary during transport, but the moving rail car produces vibrations that cause the balls of the bearing to move back and forth and wear at the raceway surface. Rheotemp™ 600 offers superior fretting protection with very little bearing mass loss.
Demanding applications require bearing lubricants with excellent oxidation stability. A lubricant with poor oxidative stability will deteriorate at high temperatures, removing the protective barrier that prevents corrosion and potentially leaving solid deposits that can contaminate the raceway and cause bearing failure. Rheotemp™ 600 exhibited no oxidation during testing.
Nye validates all our lubricants to ensure they work properly for our customers. Our ROF+ Bearing tests the functionality and life of lubricating grease in rolling bearing applications at high speeds and temperatures. Rheotemp™ 600 offers excellent bearing life and a high speed factor.
| Product | Conditions CTM | Bearing Life |
|---|---|---|
| RHEOTEMP 600 | 17,500 RPM, 150°C, 700K Speed Factor | 345.5 hrs |
* Failure occurs when 50% of bearings reach 30°C above the set temperature or the electric motor current draw exceeds 6.4 amps
