Research Article
Tribological Performance of Si-Doped Hydrogenated Diamond-Like Carbon Coatings in Different Biodiesel
Table 3
Selected results from biodiesel analyses according to DIN EN 14214:12-11.
| Feature | Limits acc. standards | RME w/o OS | RME 200 mg/kg OS | RME 1000 mg/kg OS | SME w/o OS | SME 200 mg/kg OS | SME 1000 mg/kg OS |
| Ester content | 96,5% | >99% | >99% | >99% | 98,1% | 98,1% | 98,1% | Total glyceride content | max. 0.25% | 0.1% | 0.1% | 0.1% | 0.2% | 0.2% | 0.2% | Sulphur content | max. 10 mg/kg | <5 mg/kg | <5 mg/kg | <5 mg/kg | <5 mg/kg | <5 mg/kg | <5 mg/kg | Cetane index | min. 51.0 | 52.5 | 52.5 | 52.5 | 57.1 | 57.1 | 57.1 | Water content | 500 mg/kg | 64 mg/kg | 64 mg/kg | 64 mg/kg | 127 mg/kg | 127 mg/kg | 127 mg/kg | Copper corrosion | 1 | 1 | 1 | 1 | 1 | 1 | 1 | Oxidation stability | min. 8 h | 7.3 h | 12.5 h | 24.5 h | 4.5 h | 6.4 h | 12.5 h | Acid number | max. 0.5 mg KOH/g | 0.49 mg KOH/g | 0.49 mg KOH/g | 0.49 mg KOH/g | 0.271 mg KOH/g | 0.217 mg KOH/g | 0.217 mg KOH/g |
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