Base Oil SN-350 is a high-quality Group I solvent-neutral mineral base oil with medium-to-high viscosity, produced through solvent refining, dewaxing, and hydrotreating processes. Positioned between SN-150 and SN-500 in terms of viscosity, SN-350 delivers a balanced performance profile that makes it highly suitable for automotive, industrial, and process-oil applications. Its strong lubricating film, excellent thermal stability, and compatibility with additive systems make it an essential raw material in the lubricant manufacturing industry.

With its clean appearance, stable viscosity, and strong resistance to oxidation, Base Oil SN-350 is widely used in products that require reliable lubrication under moderate to heavy loads. It is especially effective in gear oils, hydraulic oils, heavy-duty industrial oils, and high-performance greases.

Production Process of Base Oil SN-350

Base Oil SN-350 is produced using several refining steps designed to ensure purity, consistency, and long-term oxidation stability:

1. Vacuum Distillation

Crude oil undergoes atmospheric and vacuum distillation to isolate heavy fractions suitable for base oil refining.

2. Solvent Extraction

Aromatics, nitrogen compounds, and unstable hydrocarbons are removed using refining solvents such as furfural.
This step improves color, stability, and oxidation resistance.

3. Dewaxing

Long-chain wax molecules are removed to improve the pour point and enhance cold-temperature performance.

4. Hydrotreating

The refining process is completed with hydrotreating to reduce sulfur, stabilize molecular structure, and enhance oxidative resistance.

5. Filtration and Finishing

Final polishing ensures a clear, bright oil with controlled physical and chemical properties.

Key Characteristics & Performance Benefits

Base Oil SN-350 offers several advantages that make it a popular choice for lubricant manufacturers worldwide:

• Medium-to-high viscosity suitable for oils requiring greater load-carrying capacity

• Good oxidation stability, ensuring long lubricant life

• Excellent thermal resistance in moderate to high operating temperatures

• Clear and bright appearance with low impurities

• Strong lubricating film strength for mechanical stability

• Highly compatible with additives used in gear oils, hydraulic fluids, and engine oils

• Cost-effective alternative to Group II and III base oils for general applications

Applications of Base Oil SN-350

1. Engine Oils

SN-350 is commonly used in the production of mineral-based engine oils, particularly for diesel and gasoline engines requiring higher viscosity formulations.

2. Gear Oils

Its strong oil film and stable viscosity make it ideal for industrial gear oils requiring high load-carrying capability and wear protection.

3. Industrial Lubricants

SN-350 functions as a key ingredient in the production of:

• Hydraulic oils

• Compressor oils

• Heavy-duty machine lubricants

• Heat transfer oils

• Circulation oils

• Turbine oils

4. Grease Manufacturing

With its higher viscosity, SN-350 is excellent for producing greases with enhanced mechanical stability, especially lithium, calcium, and aluminum-based greases.

5. Process Oils

It is also used as a process oil in:

• Rubber compounding

• Plastics and polymer manufacturing

• Textile lubricants

• Mold-release formulations

• Paints, adhesives, and resin blends

Advantages of Base Oil SN-350 Over Other Grades

• Thicker and more stable oil film compared to SN-150

• Lower volatility than lighter grades

• Better load-bearing performance in heavy-duty environments

• Suitable alternative to SN-500 in some formulations

• Provides a balance of viscosity and cost efficiency

• Maintains stability under continuous thermal stress

Typical Technical Specifications (TDS – Typical Values)

Note: Refinery-specific COA values can vary slightly.

Storage & Handling Recommendations

To maintain the quality and stability of Base Oil SN-350:

• Store in a dry, covered facility away from heat and direct sunlight

• Keep containers sealed to prevent contamination

• Avoid moisture and foreign particle intrusion

• Use dedicated pumps and lines when possible

• Follow standard industrial safety procedures

Why Choose ZenitOil for SN-350 Supply?

ZenitOil provides high-quality SN-350 with consistent specifications, supported by:

• Reliable sourcing from reputable refineries

• Competitive pricing for bulk supply

• Fast delivery and logistics support

• COA, TDS, and MSDS availability upon request

• Technical guidance for blending and formulation

• Quality assurance at loading and shipment stages

Conclusion

Base Oil SN-350 is a versatile Group I base oil with optimal viscosity, strong lubrication performance, and excellent oxidation stability. Its balanced characteristics make it an ideal choice for engine oils, gear oils, industrial lubricants, and grease production. As a cost-effective and reliable option, SN-350 remains a key material in the global lubricants market.