AVGAS 82UL is an unleaded aviation gasoline specifically engineered for low-compression, spark-ignition piston engines that do not require the high detonation resistance of leaded aviation fuels such as AVGAS 100 or 100LL. It represents a cleaner, environmentally responsible alternative while maintaining the reliability, safety, and performance consistency required for aviation operations.
This fuel grade is commonly used in light general aviation aircraft, training fleets, ultralight aircraft, and light sport aircraft (LSA). By eliminating tetraethyl lead (TEL), AVGAS 82UL significantly reduces exhaust toxicity, engine deposits, and maintenance requirements, making it ideal for modern aviation environments and lead-restricted regions.
Refining & Manufacturing Process
AVGAS 82UL is produced using high-control refining techniques to meet strict aviation quality standards.
1. Straight-Run & Selected Light Fractions: Sourced primarily from straight-run gasoline/naphtha streams obtained during atmospheric crude oil distillation. Hydrocarbon selection focuses on stable combustion, low olefin content, and predictable evaporation behavior.
2. Hydrotreating & Purification: Deep hydrotreating removes sulfur compounds, nitrogen compounds, trace metals, and aromatics. Enhances oxidation stability and reduces corrosive tendencies.
3. Volatility & Vapor Pressure Control: Carefully engineered vapor pressure prevents vapor lock during hot-weather operations and ensures rapid cold-start performance. Volatility curve optimized for aviation altitudes rather than road use.
4. Final Filtration & Quality Polishing: Multi-stage filtration ensures zero free water and no particulate contamination, essential for protecting carburetors, fuel injectors, and fuel pumps.
Key Characteristics (Expanded)
Unleaded Composition: Contains no tetraethyl lead (TEL). Benefits include cleaner exhaust emissions, no lead fouling of spark plugs, and reduced engine oil contamination. Improves ground-crew safety and environmental compliance.
Octane Rating (~82 MON): Suitable for low-compression aircraft engines and engines specifically certified for 80/87 or 82UL fuels. Not suitable for high-compression or turbocharged engines.
Excellent Volatility & Combustion Control: Ensures quick engine start, smooth power delivery, and reliable throttle response. Maintains stability during climb and descent phases.
Clean-Burning & Engine-Friendly: Minimizes combustion chamber deposits, valve sticking, and spark-plug fouling. Extends engine and component life.
Typical Physical & Chemical Properties
| Property | Typical Value | Operational Significance |
|---|---|---|
| Fuel Type | Aviation Gasoline | Piston-engine use |
| Octane Rating (MON) | ~82 | Knock resistance |
| Lead Content | Nil | Eco-friendly |
| Density @ 15°C | ~0.72 kg/L | Fuel weight accuracy |
| Distillation Range | ~30°C – 170°C | Volatility control |
| Vapor Pressure | Aviation-controlled | Vapor-lock prevention |
| Sulfur Content | Extremely low | Clean combustion |
| Aromatic Content | Low | Material compatibility |
| Color | Typically Clear/Uncolored | Identification |
| Appearance | Clear & bright | Purity verification |
| Net Heat of Combustion | ~43 MJ/kg | Energy efficiency |
Storage, Handling & Safety
Storage Requirements: Stored in dedicated unleaded avgas tanks. Tanks must be clean, dry, water-free, clearly labeled to avoid misfueling, and compatible with standard aviation fuel materials.
Handling Precautions: Highly flammable liquid. Grounding and bonding required during fueling. Must not be mixed with automotive gasoline, leaded avgas grades, or jet fuels.
Applications
Primary Applications: Light sport aircraft (LSA), Ultralight and microlight aircraft, Training aircraft, Older low-compression piston engines, Aircraft certified for 80/87 or 82UL fuels.
Secondary Applications: Experimental aircraft, Aviation research and testing platforms.
Environmental & Operational Advantages
- Zero lead emissions
- Reduced environmental contamination around airports
- Lower engine maintenance costs
- Improved occupational safety for fuel handlers
- Supports regulatory initiatives to phase out leaded aviation fuels
Standards & Specifications
AVGAS 82UL is typically produced in accordance with: ASTM D7547 (Specification for Unleaded Aviation Gasoline), ASTM D910 (applicable clauses), and national aviation authority approvals (FAA/EASA). Actual acceptance depends on engine and airframe certification.
AVGAS 82UL vs Other Aviation Gasolines
| Parameter | AVGAS 82UL | AVGAS 100LL | AVGAS 100 |
|---|---|---|---|
| Lead Content | None | Low | High |
| Octane Rating | ~82 | 100 | 100 |
| Environmental Impact | Very Low | Moderate | High |
| Engine Compatibility | Low-compression engines | Broad | Limited |
| Maintenance Needs | Low | Medium | Higher |
Key Advantages
- Environmentally responsible unleaded fuel
- Cleaner engines and longer component life
- Reduced operational and maintenance costs
- Safer handling and reduced toxicity
- Ideal for modern light aviation fleets