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C1 grade fuel oil or C1 kerosene is a clean-burning oil with a high smoke point and extremely low sulphur content, making it suitable for horticulture applications to produce carbon dioxide and heat. It can also be used as a home heating oil as it produces no acidic gases on combustion.
The table below provides a detailed overview of the chemical and physical specifications of C1-grade fuel oil.
You can learn more about these standards in our fuel specification guide.
| Parameter | Unit | Minimum | Maximum | Typical |
| Appearance | Clear & bright, pale yellow, free from visible sediments | |||
| Char value(1) | mg/kg | – | 10 | 3 |
| Copper corrosion (2 hrs at 100°C) | Class | – | 1 | 1 |
| Density at 15°C | kg/m³ | 0.82 | 0.775 | |
| Distillation recovery | ||||
| at 200°C | % (v/v) | 15 | 60 | – |
| at 240°C | % (v/v) | 50 | – | – |
| Final boiling point | °C | – | 280 | – |
| Flashpoint (PMCC) | °C | 43 | – | – |
| Gross calorific value(2) | J/g | – | – | 46,500 |
| Kinematic viscosity at 40°C | mm²/s | – | 2 | 1.1 |
| Net calorific value(2) | J/g | – | – | 43,000 |
| Smoke point | mm | 34 | – | – |
| Sulphur | % (m/m) | – | 0.04 | <0.04 |
| Water content | mg/kg | – | 200 | <100 |
Download C1 Grade Fuel Oil Specifications in PDF here.
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