| OELCHECK test instrument: | Micro Conradson |
| Sample quantity: | 5 ml |
| Unit: | % (weight) |
| Test result: | Conradson carbon residue |
| Analysis for: | heat transfer oils, compressor oils |
| Brief description: | Carbon residue indicates the amount of residue produced when 3 grams of the oil for testing is smouldered in a special Conradson apparatus under defined conditions. |
| Statement: | Residue in the form of carbon deposits or coke may be produced when mineral oils are exposed to excessive thermal load or do not combust completely due to a lack of oxygen. For heat transfer oils, carbon residue is an assessment criterion for oil change prolongation. For alloyed, low-ash compressor oils (VBL, VCL), potential deposits on valves can be detected from the carbon residue. |
| Underlying test standard: | DIN EN ISO 10370, ASTM D4530 (comparable results as ASTM D189) |
| Comparable methods: | DIN 51551-1: big approach ASTM D189: big approach |
