Issue Date: June 2025
Revision: 02
Doc No: ACS-TDS-GM-XP
Aerosil Gearmax XP
Mineral EP Industrial Gear Oil
1. Product Description
2. Typical Physical & Chemical Properties
Typical values — not to be used as specification limits. Test methods per ISO/ASTM/DIN standards.
| Property | ISO 68 | ISO 100 | ISO 150 | ISO 220 | ISO 320 | ISO 460 | ISO 680 |
|---|---|---|---|---|---|---|---|
| Kinematic Viscosity @ 40°C (mm²/s) | 61–74 | 96–104 | 135–165 | 198–242 | 288–352 | 414–506 | 612–748 |
| Kinematic Viscosity @ 100°C (mm²/s) | 8.2 | 11.2 | 15.1 | 19.4 | 25.8 | 34.2 | 46.5 |
| Viscosity Index | ≥ 95 | ≥ 95 | ≥ 95 | ≥ 95 | ≥ 95 | ≥ 95 | ≥ 95 |
| Density @ 15°C (kg/m³) | 878 | 885 | 889 | 893 | 897 | 902 | 908 |
| Flash Point COC (°C) | ≥ 190 | ≥ 200 | ≥ 205 | ≥ 210 | ≥ 215 | ≥ 220 | ≥ 225 |
| Pour Point (°C) | ≤ −21 | ≤ −18 | ≤ −18 | ≤ −15 | ≤ −12 | ≤ −9 | ≤ −6 |
| FZG Gear Test (DIN 51354-2) | Fail Stage ≥ 12 | Fail Stage ≥ 12 | Fail Stage ≥ 12 | Fail Stage ≥ 12 | Fail Stage ≥ 12 | Fail Stage ≥ 12 | Fail Stage ≥ 12 |
| Copper Corrosion (3h/100°C) | 1b | 1b | 1b | 1b | 1b | 1b | 1b |
| Water Separability (54°C, min) | ≤ 30 | ≤ 30 | ≤ 30 | ≤ 30 | ≤ 30 | ≤ 30 | ≤ 30 |
| Foam Tendency (ml) | ≤ 50/0/50 | ≤ 50/0/50 | ≤ 50/0/50 | ≤ 50/0/50 | ≤ 50/0/50 | ≤ 50/0/50 | ≤ 50/0/50 |
3. Special Purpose Additive Technology
Aerosil Gearmax XP incorporates four proprietary additive technologies beyond the standard EP/AW package, each targeting a specific failure mode in industrial gear systems.
Adhesive-Cohesive Polymer
A high-molecular-weight polymer additive that imparts tackiness and film-forming tenacity to the oil. It ensures the lubricant film clings to gear flanks and bearing surfaces even under centrifugal throw-off, shock loading, and vibration.
- Prevents oil throw-off on open gears and ring gears
- Maintains continuous lubrication under intermittent or shock loads
- Reduces lubricant consumption in splash-lubricated systems
Seal Conditioner
A specialised elastomer-compatible additive that actively conditions and rejuvenates rubber seals and gaskets. It counteracts the hardening, shrinkage, and embrittlement that cause seal leakage over time.
- Prevents seal leakage and oil loss at gearbox housings
- Compatible with NBR, FKM, HNBR, and PTFE seals
- Extends seal service life — reduces unplanned maintenance
Gear Wear Protection (EP/AW)
A sulphur-phosphorus EP additive system that reacts with metal surfaces under high contact pressure to form a sacrificial tribochemical layer. This prevents metal-to-metal contact, scuffing, and pitting on gear tooth flanks.
- FZG fail stage ≥ 12 (DIN 51354-2) — high load-carrying capacity
- Protects against micro-pitting, scuffing, and abrasive wear
- Significantly extends gearbox overhaul intervals
Water Emulsification Resistance
A demulsifier additive system that rapidly separates entrained water from the oil phase. It prevents stable water-in-oil emulsions that degrade the lubricant film, promote corrosion, and accelerate additive depletion.
- Water separability ≤ 30 min at 54°C (ASTM D1401)
- Maintains oil film integrity in wet or humid environments
- Supports longer drain intervals by preventing oil degradation from water contamination
4. Performance Features & Benefits
- Extreme-pressure (EP) additive package — FZG fail stage ≥ 12
- Adhesive-cohesive polymer additive — ensures tenacious oil film adhesion on gear flanks, preventing oil throw-off and maintaining continuous lubrication under shock loads
- Seal conditioner additive — rejuvenates and conditions elastomeric seals to prevent hardening, shrinkage, and leakage, extending seal service life significantly
- Advanced anti-wear (AW) chemistry — forms a protective tribochemical layer on gear tooth surfaces, minimising gear wear and pitting under boundary lubrication conditions
- Demulsifier system for rapid water separation — quickly releases entrained water to prevent emulsification, protecting against corrosion and maintaining oil film integrity for longer drain intervals
- Excellent oxidation and thermal stability — resists oil degradation at elevated operating temperatures
- Good rust and corrosion protection for ferrous and non-ferrous metals
- Compatible with standard mineral oil seals and paints
5. Applications
- Enclosed industrial gearboxes (spur, helical, bevel, worm)
- Open gear drives and ring gears
- Circulating lubrication systems
- Bearings operating under high load
- Steel mills, cement plants, mining equipment
6. Approvals & Specifications Met
7. Packaging
- 20 L Pail
- 208 L Drum
- 1000 L IBC
Custom pack sizes available on request.
8. Storage & Handling
Store in a cool, dry, well-ventilated area away from direct sunlight. Shelf life: 36 months in original sealed container.
Avoid prolonged skin contact. Use nitrile gloves and safety glasses. Refer to SDS for full handling guidance.
9. Health, Safety & Environment
A Safety Data Sheet (SDS) is available upon request and must be consulted before use. This product is not classified as hazardous under CLP/GHS regulations at normal operating conditions. Dispose of used oil in accordance with local environmental regulations. Do not discharge to drains, water courses, or soil.
Disclaimer: The information contained in this Technical Data Sheet is based on tests believed to be reliable and is offered in good faith. The data is typical of the product and should not be used to establish specification limits. Aerosil Chemsol Specialties B.V. reserves the right to modify product formulations and specifications without prior notice. Users should verify suitability for their specific application. Aerosil Chemsol Specialties B.V. accepts no liability for any loss or damage arising from the use of this information.