What is Klüber ISOFLEX NBU?
Klüber ISOFLEX NBU is a high-speed bearing grease manufactured by Klüber Lubrication, a Germany-based global specialist in specialty industrial lubricants. It is engineered for High-speed bearings and related industrial applications requiring reliable, long-term lubrication performance.
This product belongs to the Klüber ISOFLEX NBU family, recognized in the industrial lubrication industry for long-life high-speed grease; low starting torque; one of kluber's most established product lines. The formulation combines synthetic hydrocarbon (diester / ester blend depending on grade) as the base oil with barium complex soap as the thickener system, operating within a temperature range of -40°C to +130°C.
Technical Specifications
| Brand |
KLÜBER (Klüber Lubrication München GmbH & Co. KG) |
| Product Line |
Klüber ISOFLEX NBU |
| Product Type |
High-Speed Bearing Grease |
| Base Oil |
Synthetic hydrocarbon (diester / ester blend depending on grade) |
| Thickener |
Barium complex soap |
| NLGI Grade |
2 (typical; varies by grade) |
| Temperature Range |
-40°C to +130°C |
| Color |
Beige to light brown |
| Storage |
Store in original sealed container at 0°C to 40°C. Protect from moisture, frost, and direct sunlight. |
| Shelf Life |
36 months from date of manufacture under recommended storage conditions |
Note: Specifications are based on publicly available product data from Klüber Lubrication. Consult the official datasheet for the most current information.
Applications & Industries
Klüber ISOFLEX NBU is specified for use in the following applications:
-
High-speed bearings — Suitable due to the product's formulation characteristics and performance profile.
-
machine tool spindles — Suitable due to the product's formulation characteristics and performance profile.
-
electric motor bearings — Suitable due to the product's formulation characteristics and performance profile.
-
precision instrument bearings — Suitable due to the product's formulation characteristics and performance profile.
-
grinding spindles — Suitable due to the product's formulation characteristics and performance profile.
-
textile spindles — Suitable due to the product's formulation characteristics and performance profile.
-
dental turbines — Suitable due to the product's formulation characteristics and performance profile.
-
turbochargers — Suitable due to the product's formulation characteristics and performance profile.
-
vacuum pumps — Suitable due to the product's formulation characteristics and performance profile.
-
precision gearboxes — Suitable due to the product's formulation characteristics and performance profile.
-
measuring instruments — Suitable due to the product's formulation characteristics and performance profile.
-
optical equipment bearings — Suitable due to the product's formulation characteristics and performance profile.
-
high-speed fans — Suitable due to the product's formulation characteristics and performance profile.
-
centrifuge bearings — Suitable due to the product's formulation characteristics and performance profile.
Advantages
- Proven long-life high-speed grease with decades of field performance
- Low starting torque — ideal for applications with frequent start-stop cycles
- Good low-temperature performance down to -40°C
- Excellent wear protection for precision bearing surfaces
- Stable consistency under mechanical working
- Good corrosion protection in humid industrial environments
- Reduced friction compared to conventional lithium greases
- Suitable for both horizontal and vertical mounting positions
- Good oxidation stability for extended service life
- Widely available worldwide through KLUBER distribution network
- Compatible with most bearing cage materials
- Low oil separation tendency during prolonged storage
- Quiet running characteristics benefit noise-sensitive applications
- Suitable for oil-air and oil-mist lubrication system compatibility checks
- Reliable performance in varied industrial environments
Limitations & Considerations
- Maximum continuous operating temperature limited to 130°C
- Not suitable for food-grade or pharmaceutical applications
- May soften if mixed with incompatible thickener types
- Water resistance is moderate — not recommended for submerged applications
- Not designed for extreme pressure (EP) applications
- Should not be used in applications with aggressive chemicals
- Relubrication intervals must be adjusted for high-temperature operation
- Performance may vary if contaminated with solid particles
- Over-lubrication can cause temperature rise in high-speed bearings
- Limited compatibility with silicone-based seal materials in some grades
Frequently Asked Questions
Q: What applications is Klüber ISOFLEX NBU designed for?
Klüber ISOFLEX NBU is engineered for High-speed bearings. The product is commonly specified in industries including High-speed bearings, machine tool spindles, electric motor bearings, precision instrument bearings, grinding spindles and related industrial sectors where reliable lubrication is critical.
Q: What temperature range does it operate in?
The operating temperature range is -40°C to +130°C. Always verify the specific temperature requirements for your application against the product datasheet to ensure compatibility.
Q: Is Klüber ISOFLEX NBU food grade?
No, Klüber ISOFLEX NBU is not NSF H1 registered for food-grade applications. For food processing environments requiring NSF H1 certification, consider Klüberfood NH1 or Klubersynth UH1 product series.
Q: Can this product be mixed with other greases?
As a general engineering practice, mixing greases with different thickener types is not recommended. Incompatible thickeners can cause the grease to soften excessively or harden, potentially leading to lubrication failure. If switching from another product, it is best practice to thoroughly purge the old lubricant before applying the new one.
Q: How should this product be stored?
Store in original sealed container at 0°C to 40°C. Protect from moisture, frost, and direct sunlight. The typical shelf life is 36 months from date of manufacture under recommended storage conditions from the date of manufacture under recommended storage conditions.
Sourcing & Technical Support
KOEED is an authorized KLÜBER Lubrication distributor. Klüber ISOFLEX NBU is in stock with worldwide shipping available. Product datasheets and Material Safety Data Sheets (MSDS) are available on request.
For technical consultation, volume pricing, or to request a competitive quote, contact Moritta@KOEED.COM. Our technical support team typically responds within 24 hours. When requesting a quote, please include product specifications, required quantity, and shipping destination for fastest service.
