Description:
Group I Base Oils are solvent-refined mineral oils produced through atmospheric distillation followed by solvent extraction, dewaxing, and mild hydrofinishing. These oils are classified by API as Group I due to their viscosity index ranging between 80 and 105, sulfur content above 0.03%, and aromatic content exceeding 10%. Group I oils have long been the backbone of lubricant formulations and continue to be widely used across the globe for a broad range of industrial and automotive applications.
Manufacturing Process:
The production of Group I base oils involves several key refining steps:
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Solvent Extraction: Removes aromatic compounds to improve oxidative stability.
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Solvent Dewaxing: Enhances low-temperature properties by removing waxes.
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Hydrofinishing: Provides mild hydrogen treatment to improve color and stability.
Key Technical Characteristics:
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Viscosity Index (VI): 85–105
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Sulfur Content: Typically >0.03%
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Flash Point: >200°C (varies by grade)
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Pour Point: -6°C to -12°C
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Color: L0.5–L3.0 (ASTM D1500)
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Aromatic Content: Moderate to high, enhancing solvency for additive blending
Benefits:
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High solvency improves compatibility with additive packages
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Proven thermal and oxidative performance in standard operating conditions
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Economical choice for a wide range of lubricant formulations
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Reliable supply and global availability
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Suitable for blending with higher group base oils for custom performance tuning
Typical Applications:
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Automotive Lubricants: Engine oils, gear oils for older-generation engines
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Industrial Oils: Hydraulic fluids, circulating oils, compressor oils
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Metalworking Fluids: Soluble cutting oils, machining lubricants
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Process Oils: Rubber and plastic processing
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Marine and Railroad Oils: Where high solvency and traditional additive systems are preferred
Available Grades:
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SN150, SN500, SN600, BRIGHT STOCK 150
Each grade offers a different viscosity profile, allowing formulators to tailor products to performance and climate requirements.
