Description
Castrol Alphasyn GS 320 is a premium synthetic gear lubricant engineered for industrial enclosed gear systems where high mechanical and thermal stresses are present, such as large mills, calenders, heavy drives, and worm gearboxes. It’s formulated on advanced PAG base fluids with antioxidant, rust‑inhibiting, and extreme pressure (EP) additives that deliver excellent thermal and oxidative stability, helping to minimize sludge and deposit formation and supporting extended oil drain intervals compared with conventional mineral‑based gear oils.
The high viscosity index and carefully balanced formulation also help reduce frictional losses, which can lower operating temperatures and improve gearbox efficiency. This product can operate reliably across a wide temperature range (continuous up to ~150 °C and intermittent peaks to ~220 °C), making it suitable for demanding industrial environments. Alphasyn GS 320 meets DIN 51517 Part 3 CLP and ISO 12925‑1 CKD lubricant standards for industrial gear oils.
Note: PAG‑based gear oils like this are not miscible with mineral oil gear lubricants; equipment should be flushed if converting from mineral oils, and seal compatibility should be checked as some elastomers differ in service with PAG fluids.
Key Features
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PAG synthetic base with EP additives: Provides superior thermal and oxidative stability and enhanced wear protection compared with mineral oils.
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ISO VG 320 viscosity: Offers strong film strength for heavy loads and reliable performance at elevated temperature.
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High viscosity index & low pour point: Supports a wide service temperature range.
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Reduced frictional losses: Helps decrease energy consumption and sump temperatures.
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CLP classification (DIN 51517‑3): Meets industrial gear oil requirements for enclosed gearboxes.
Applications
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Industrial enclosed gearboxes subjected to high temperature and load.
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Large mills, calenders, and heavy drives where thermal stability and extended drain intervals are beneficial.
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Worm reduction gearboxes and other systems with significant sliding contact.




