Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
D4806-21 – Standard Test Method Technical Guide
🔍 Scope and Application
This specification, ASTM D4806-21, covers nominally anhydrous denatured fuel ethanol intended for blending with unleaded or leaded gasolines at 1% to 15% by volume. It is used in automotive spark-ignition engines as covered by Specification D4814 and other fuel applications. The standard highlights the importance of jurisdictional regulations for denaturants.
| 🟦 Standard | 📏 Description | ⚡ Application |
|---|---|---|
| D86 | Distillation of Petroleum Products and Liquid Fuels at Atmospheric Pressure | Determines distillation characteristics |
| D381 | Gum Content in Fuels by Jet Evaporation | Measures existent gum content |
| D1613 | Acidity in Volatile Solvents and Chemical Intermediates | Determines acidity |
| D5453 | Total Sulfur in Light Hydrocarbons by Ultraviolet Fluorescence | Quantifies sulfur content |
| D5501 | Ethanol and Methanol Content in Fuels Containing Greater than 20% Ethanol | Determines alcohol content |
⚙️ Technical Requirements and Specifications
The denatured fuel ethanol must comply with specific chemical and physical properties to ensure safe and efficient blending. Key properties include acidity, sulfur content, and gum content. The standard references various test methods to verify compliance. Blending ratios are specified as 1% to 15% by volume with gasoline.
| 🟦 Property | 📏 Requirement | ⚡ Test Method |
|---|---|---|
| Acidity | As per specification limits | D1613 |
| Sulfur Content | As per specification limits | D5453 or D2622 |
| Ethanol Content | Nominally anhydrous, >99% | D5501 |
| Gum Content | As per specification limits | D381 |
💡 Technical Note: Denaturant selection must align with local regulations to ensure proper denaturing and compliance with fuel standards. Variability across jurisdictions requires careful review.
📊 Test Methods and Procedures
The standard emphasizes precise testing for quality assurance. Sampling follows practices in D4057 (manual) and D4177 (automatic). Key methods include D86 for distillation, D381 for gum content, and D5453 for sulfur analysis. A safety caveat applies to modifications in Section 8.7.
⚡ Safety Note: Users must establish appropriate safety, health, and environmental practices before handling denatured fuel ethanol. The standard includes specific hazard warnings for method modifications.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D4806-21? It specifies denatured fuel ethanol for blending with gasolines at 1% to 15% by volume for use in spark-ignition engines.
💡 Are there universal denaturant requirements? No, denaturant types and concentrations vary by jurisdiction. Users must consult local regulatory agencies for compliance.
⚡ What test methods are critical for quality control? Essential methods include D5501 for ethanol content, D5453 for sulfur, and D86 for distillation to ensure fuel properties.
📌 How is ethanol content verified? Using Test Method D5501, which determines ethanol and methanol content in fuels containing greater than 20% ethanol, ensuring accurate blending.