Basic Properties and Composition

• Ingredients and Standards: Composed of sodium fatty acid soap thickened with No. 20 aviation lubricating oil and colloidal graphite. Complies with SH/T 0376-92 (China Petrochemical Industry Standard). The colloidal graphite enhances anti-wear and extreme pressure (EP) performance, making it suitable for high-load scenarios.

• Temperature Range: Operates effectively between -45°C to 180°C, with short-term tolerance up to 220°C. However, usage temperatures should remain 20–30°C below the dropping point. Discrepancies exist in literature: older sources cite a dropping point of 120°C, while newer data (e.g., ) reports 285°C, likely due to formulation upgrades or testing variations.

Applications

• Aerospace: Primarily used in aircraft landing gear wheel bearings, valve systems, and rocker arms in piston-type aviation engines.

• Industrial: Suitable for high-temperature engine components, sintering furnace bearings, oven chains, and high-temperature furnace equipment. For universal joints operating above 120°C, No. 4 grease is strongly recommended.

Key Features

1. High-Temperature Stability: Maintains lubrication at 180°C, with excellent colloidal and mechanical stability.

2. EP and Anti-Wear Performance: Colloidal graphite and molybdenum disulfide (in some variants) reduce wear under heavy loads.

3. Limitations: Poor water resistance—avoid humid or wet environments. Prolonged high temperatures may degrade performance due to oxidation, necessitating regular replacement.

Technical Parameter Comparisons

• Data Variations: Early data lists a dropping point of 120°C and penetration of 320, while newer sources report 285°C and 237 penetration. These differences may reflect product iterations or testing standards (e.g., ASTM vs. GB methods).

• Certifications: Passes corrosion resistance (copper strip test), evaporation loss, and steel mesh oil separation tests, meeting anti-rust and oxidation resistance requirements.

Usage Recommendations

• Selection Criteria: Match grease to load, speed, and temperature. For example, high-speed applications require low-viscosity base oils; heavy loads demand high consistency or solid lubricants (e.g., graphite).

• Compatibility: Avoid mixing with other greases. Clean residues from prior lubricants before application.

Market and Brands

• Major Brands: Produced byShenyang Teli Petrochemical Co., Ltd. International brands like Shell and Mobil offer comparable high-temperature greases.

• Testing Standards: Focus on high-temperature stability, oxidation resistance, and EP performance. Authorized labs (e.g., China Analysis and Testing Institute) provide verification services.

Summary

Teli No. 4 High-Temperature Grease is ideal for aerospace and industrial applications under extreme heat and heavy loads. However, its water sensitivity and oxidation risks require careful maintenance. Users should adhere to updated specifications, operational conditions (temperature, load), and the SH/T 0376-92 standard for compliance.