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Isthmus-34 Light is asour crude oil produced inMexico mainly in theCampeche zone, in theGulf of Mexico along with the extraction centers inChiapas,Tabasco, andVeracruz.[1] The name derives from the nearbyIsthmus of Tehuantepec. Before 2017, the oil was a component of theOPEC Reference Basket (despite Mexico's not being a part ofOPEC).[2] It has the following characteristics:
| Properties | Isthmus |
| Density (20 °C) | 0.8535 g/cm3 |
| API gravity | 33.74 °API |
| Viscosity | |
| 60 °F (15.6 °C) | 65.6Saybolt Universal Seconds (SUS) |
| 70 °F (21.1 °C) | 57.8 SUS |
| 77 °F (25.0 °C) | 54.5 SUS |
| Sulphur total, weight % | 1.45 |
| Oils, weight % | 89.2 |
| Alkanes, weight % | 8.1 |
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