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Butane is a flammable hydrocarbon gas that is a constituent of petroleum and is used in bottled form as a fuel. It is often added to regular gasoline to boost its performance without creating a highly volatile product. The gas is also used in refrigeration and heating systems, and as fuel for cigarette lighters.
| Molecular Properties | |
|---|---|
| Chemical Name | Butane |
| Molecular Formula | C4H10 |
| Molecular Weight | 58.12 |
| Normal Butane Specifications | ||
|---|---|---|
| Component | Test Methods | Specifications |
| Isobutane & Lighter | ASTM D-2163 | 5 max |
| Normal Butane | ASTM D-2163 | 94 min |
| Pentanes Heavier | ASTM D-2163 | 2 max |
| Corrosion: PPM by weight | ASTMD-1838 | 1 max |
| Total Sulfur | ASTM D-6667 | 140 ppmw, max |
| Volatile Residue: Temperature @ 95% evaporation | ASTM D-1837 | 36 max |
| Free water | visual | no free water |
| Isobutane Specifications | ||
|---|---|---|
| Component | Test Methods | Specifications |
| Propane, Propylene and Lighter | ASTM D-2163 | 3 max |
| Isobutane | ASTM D-2163 | 96 min |
| Butylene, Normal Butane & Heavier | ASTM D-2163 | 4 max |
| Vapor Pressure, PSIG @ 100°F | ASTM D-1267 | 62 max |
| Corrosion: PPM by weight | ASTMD-1838 | 1 max |
| Total Sulfur | ASTM D-6667 | 140 ppmw, max |
| Free Water | Visual | None |