MOLYKOTE BG-555
Harmonization Code : 3403.19 | Lubricating Preparations (With 70% or More Petroleum Oils) For Automotive and Other Uses
Main features
- Low-Noise Bearing Grease
- Water-Washout and Corrosion Resistance
- -40 to 150 deg C Service Range
Product Description
MOLYKOTE® BG 555 Low Noise Grease is a high-performance, wide-temperature-range synthetic grease thickened with lithium soap. Manufactured using a special process in a dust-free environment with strictly selected additives, this light straw-colored grease is expertly formulated to suppress noise and achieve exceptionally quiet bearing performance. The synthetic base oil ensures minimal internal resistance, providing outstanding low-temperature capabilities while maintaining excellent anti-rust properties even in severe moisture or saltwater conditions.
Key features
- Noise-suppressing performance: Purified raw materials and controlled manufacturing yield a Class II/1 rating in the FAG MGG-11 low-noise performance test.
- Extended service life: Highly oxidation-resistant and thermally stable, providing a significantly longer performance life (4,000 hours at 125°C) than conventional wide-temperature lithium greases.
- Wide temperature capability: Functions reliably from -40°C to +150°C (-40°F to 302°F), facilitating easy cold starting for precision machinery and small motors.
Applications / Suitable for
- Rolling element bearings requiring low noise and long operational life at elevated temperatures
- Precision machines and small size electric motors requiring low starting torque
- Automotive electric equipment operating in severe environmental conditions (e.g., saltwater)
TDS, SDS & Technical Documents
Technical Specifications
No specifications available.
Additional Information
As-supplied / before-processing properties
Typical properties; these values are not intended for use in preparing specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Chemical Composition | Synthetic lubricating oils, lithium 12-hydroxyoctadecanoate soap | - | - |
| Appearance / Color | Light straw / Light yellow | - | Grease |
| Base Oil Kinematic Viscosity | 26.0 | mm²/s | at 40°C (104°F) (ASTM 445) |
| Worked Penetration | 255 | mm/10 | ASTM D217 |
| Relative Density | 1.0 | - | Water = 1 |
| Flash Point | 225 | °C | Closed cup (437°F) |
| Shelf Life | 36 | months | When stored at or below 40°C (104°F) from the date of production |
After-processing / in-service properties
Typical properties; these values are not intended for use in preparing specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Service Temperature Range | -40 to +150 | °C | (-40 to +302 °F) |
| Dropping Point | 195 | °C | (383°F) (ASTM D566) |
| Working Stability | 315 | mm/10 | FTM 791C-313 |
| Water Washout | 1.3 | mass % | 1 hour at 38°C (100.4°F) (ASTM D1264) |
| Low-Temperature Torque (Starting) | 15 | N.cm | at -40°C (-40°F) (ASTM D1478-63) |
| Low-Temperature Torque (Running) | 3.0 | N.cm | at -40°C (-40°F) (ASTM D1478-63) |
| Evaporation Loss | 0.30 | mass % | 22 hours at 99°C (210.2°F) (ASTM D972) |
| Oil Separation | 1.0 | mass % | 24 hours at 100°C (212°F) (FTM 791C-321 Mod) |
| Oxidation Stability | 2.5 | kPa | ASTM D942 |
| Copper Strip Corrosion | 1a | - | 24 hours at 100°C (212°F) (ASTM D4048) |
| Corrosion Preventive Properties | 1 | - | 48 hours at 52°C (125.6°F) (ASTM D1743-73) |
| SKF-Emcor Method Degree of Corrosion | 0-0 | - | DIN 51 802 |
| Low-Noise Performance Test Class | II/1 | - | FAG MGG-11 |
| DN Value | 1,300,000 | mm/min | Calculated approximation (varies with temperature, load, bearing type) |
| Life Performance | 4,000 | hour | at 125°C (257°F) (ASTM D1741) |
