High-temperature Grease Uses

High-temperature grease is an essential lubricant used in various industrial and automotive applications where extreme heat resistance is required. It provides superior protection against wear, corrosion, and oxidation, making it a preferred choice for machinery operating under high thermal conditions. In this article, we will explore the uses of high-temperature grease, its benefits, and the specific advantages of calcium-based and lithium grease.

What is High-Temperature Grease?

High-temperature grease is a type of lubricant formulated with heat-resistant base oils and thickening agents that ensure stability under extreme temperatures. It is designed to maintain its consistency and lubrication properties even when exposed to intense heat.

Key Benefits of High-Temperature Grease:

Thermal Stability: Withstands extreme heat without breaking down.
Wear Protection: Reduces friction and prevents metal-to-metal contact.
Corrosion Resistance: Protects machinery from rust and oxidation.
Extended Equipment Life: Ensures smooth operation and reduces maintenance costs.
Sealing Capability: Prevents contamination from dust, dirt, and moisture.

Common Uses of High-Temperature Grease

Automotive Industry: Used in wheel bearings, chassis, and engine components.
Industrial Machinery: Essential for gears, chains, and conveyors in manufacturing plants.
Steel Mills: Applied in high-heat environments such as furnaces and rollers.
Mining Equipment: Protects heavy-duty machinery from wear and extreme heat.
Aerospace Applications: Used in aircraft engines and landing gear systems.
Food Processing Units: Special food-grade high-temp grease is used in high-heat cooking machinery.
Power Plants: Lubricates turbines, generators, and other high-temp equipment.

Types of High-Temperature Grease

Calcium-Based Grease

Calcium-based grease is widely used for its excellent water resistance and moderate high-temperature performance. It is commonly applied in marine, automotive, and industrial applications where moisture and heat resistance are required.

Calcium-Based Grease Specifications:

Free Acid: 0.2% wt
Penetration (unworked/worked): 1000 (ASTM D-1298)
Dropping Point: 102°C
Flash Point: 174°C
NLGI Grade: 3

Lithium Grease

Lithium grease is another popular high-temperature grease, offering superior thermal and mechanical stability. It is highly versatile and used in various industries, including automotive and manufacturing.

Lithium Grease Specifications:

Property	NLGI Grade 1	NLGI Grade 2
Soap Type	EP	EP
Dropping Point (°C)	Min 180	Min 180
Worked Penetration @ 25°C (mm/10)	310-340	265-295
Mineral Oil Viscosity @ 40°C (cSt)	Min 160	Min 160
Mineral Oil Viscosity @ 100°C (cSt)	Min 15	Min 15
Water Washout Resistance (% Mass)	Max 10	Max 5
Copper Strip Corrosion	1b	1b
Oil Separation (18h @ 40°C)	Max 5	Max 5
Operating Temperature Range (°C)	20-120	20-120
Color	Yellow	Yellow

Choosing the Right High-Temperature Grease

When selecting a high-temperature grease, consider the following factors:

Operating Temperature: Ensure the grease can withstand the required temperature range.
Load Carrying Capacity: Choose a grease with high EP (Extreme Pressure) properties.
Water Resistance: Essential for applications exposed to moisture.
Compatibility: Ensure the grease is compatible with existing lubricants and machinery materials.

Top 10 FAQs About High-Temperature Grease

What is the maximum temperature high-temp grease can handle?
- Most high-temperature greases can handle up to 200°C, while specialty greases can go beyond 300°C.
Can I mix different types of grease?
- It is not recommended unless they have similar base oils and thickeners.
How often should high-temperature grease be applied?
- Frequency depends on operating conditions, but regular monitoring is advised.
Is lithium grease better than calcium grease?
- Lithium grease has better temperature and mechanical stability, while calcium grease excels in water resistance.
Can high-temperature grease be used in food processing?
- Yes, food-grade variants are available for such applications.
What happens if grease overheats?
- It may break down, lose viscosity, and fail to lubricate properly.
Does high-temperature grease prevent rust?
- Yes, most high-temp greases have anti-corrosion properties.
Can I use high-temperature grease on bearings?
- Yes, it is commonly used in high-speed and high-load bearings.
What is NLGI Grade in grease?
- It measures grease consistency; higher grades are thicker.
Where can I buy high-quality high-temperature grease?